Nitrox
This document was uploaded by user and they confirmed that they have the permission to share it. If you are author or own the copyright of this book, please report to us by using this DMCA report form. Report DMCA
Overview
Download & View Nitrox as PDF for free.
More details
- Words: 8,027
- Pages: 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
Global Offshore Pty Ltd
EAD EQUIVALENT AIR DEPTH DIVING MANUAL PA-D-PR-99484
Unless signed and stamped ‘controlled’ this document is current only for the date as shown at the bottom of the page.
Copy No.: Distributed to:
Rev
Description
Date
Prepared
Checked
Approved
A
Issued for Approval
17/9/99
CR
MY
CR
0
Issued for Use
22/9/99
SW
MY
PH
CONTENTS
G:\Qa\Diving\Dpr99484
19/6/09
1 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
1.0
INTRODUCTION
2.0
DETERMINATION OF CORRECT EAD SCHEDULE
3.0
DETERMINATION OF PPO2
4.0
DETERMINATION OF BOTTOM TIME
5.0
SAFETY PRECAUTIONS WHEN MIXING GAS
6.0
MIXING GAS
7.0
STEP BY STEP MIXING INSTRUCTIONS
8.0
CHECKING THE ANSWERS
9.0
MANUAL GAS MIXING SHEET
10.0
OPERATIONAL PROCEDURES – SURFACE ORIENTATED DIVING
11.0
OPERATIONAL PROCEDURES – BELL DIVING
12.0
EAD CALCULATION FOR 40%O2/60%N2 (TABLE 1A)
13.0
PPO2 CALCUALTION FOR 40%O2/60%N2 (TABLE 1B)
14.0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 (TABLE 1C & 1D)
15.0
EAD CALCULATION FOR 32%O2/68%N2 (TABLE 2A)
16.0
PPO2 CALCULATION FOR 32%O2/68%N2 (TABLE 2B)
17.0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 (TABLE 2C & 2D)
18.0
THERAPEUTIC PROCEDURES
G:\Qa\Diving\Dpr99484
19/6/09
Revision: 0
2 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
1.0
Revision: 0
INTRODUCTION Equivalent Air Depth or Nitrox diving is the technique whereby the O2 in the breathing mixture is elevated above 21%, and the balance of N2 reduced proportionally. Due to the reduction in the nitrogen content in the breathing mixture, a diver may work longer at set depth than a diver breathing air and have a lower N2 uptake. A diver working at 70 fsw / 21 meters breathing a 40%O2 / 60%N2 mixture is breathing a gas containing the same partial pressure of nitrogen as a diver working 45 fsw / 13.5 meters, and would therefore decompress on the same schedule as a diver working at 45 fsw / 13.5 meters. Nitrox diving is carried out using the same principles as surface orientated air diving. Once the EAD has been calculated, the diver profile should run in accordance with the Standard Air Diving Tables as though it was an air dive. With the high oxygen percentage involved with Nitrox diving, all diving components in contact with Nitrox are to be O2 cleaned to minimise the possibility of an oxygen explosion. During Nitrox diving the following will be adhered to: • Oxygen analyser monitoring the divers breathing mixture at all times. • Two (2) independent supplies of Nitrox to the working diver or divers. • Supply to the standby diver to be separate source from the divers breathing supplies. • No smoking in the control van. • Oxygen analyser monitoring the control van • Diver’s bailout content to be Nitrox. • Diver’s stage bottles content to be Nitrox. • Diver tethers - gas supply hose to be O2 cleaned. • Diver bailouts - to be O2 cleaned. • Diver 1st stage regulators – to be O2 cleaned.
G:\Qa\Diving\Dpr99484
19/6/09
3 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
2.0
Revision: 0
DETERMINATION OF CORRECT EAD SCHEDULES Although infinitely variable, operationally, 2 Nitrox mixtures are deemed to be suitable for EAD diving by the company, they are as follows: 40%O2/60%N2 Depth range: 32%O2/68%N2 Depth range:
0 – 80 fsw 80 – 110 fsw
In order to determine the correct EAD schedule, Table 1A or 2A should be consulted. The optimum gas mix is shown in the centre column with allowances for + 8% on either side for a miss mix situation. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers Equivalent Air Depth, this depth is then used for planning the dive, and for subsequent decompression purposes. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross reference Table 1A, the resulting Equivalent Air Depth is found to be 37 fsw. Table 1A is designed to show the optimum oxygen mixture of 40%, which appears in the centre column, flanked on either side by + 8%, to allow for gas mixing errors, and table 2B is designed to show the optimum oxygen mixture of 32%, flanked on either side by + 8%, to allow for gas mixing errors. When calculating the EAD, it should be determined by the gas on line which has the lowest oxygen percent, should this gas then be used during the dive, recalculation will not be necessary. Although the depth range for 32%O2/68%N2 is 80 – 110 fsw, it may be used from the surface down to 110 fsw, however the benefits obtained shallower than 80 fsw are lost.
3.0
DETERMINATION OF PPO2
G:\Qa\Diving\Dpr99484
19/6/09
4 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
If the PPO2 of the divers inspired breathing gas is required to be known, then refer to table 1B or 2B, these tables are designed to show the optimum oxygen mixture of 40%, and 32%, flanked on either side by + 8%, to allow for gas mixing errors. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers Partial Pressure of oxygen. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross referencing Table 1B, the resulting Partial Pressure of Oxygen is found to be 1.12 ATA.
G:\Qa\Diving\Dpr99484
19/6/09
5 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
4.0
Revision: 0
DETERMINATION OF BOTTOM TIME
The bottom time of a surface orientated dive is governed by current Health and Safety Offshore Safety Division Diving Safety Memorandums, and these should be consulted in order that the maximum allowable bottom time can be derived.
G:\Qa\Diving\Dpr99484
19/6/09
6 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
5.0
Revision: 0
SAFETY PRECAUTIONS WHEN MIXING GAS When mixing gas, the following safety precautions are to be strictly adhered to:a)
NEVER pump oxygen.
b)
Oxygen is only to be CASCADED.
c)
Ensure all OXYGEN hoses and associated fittings are OXYGEN clean and suitable for OXYGEN use.
d)
When handling H.P. gas, ie. connecting hoses, opening valves, hard hats are to be worn, and “safety” glasses conforming to AS/NZS1337 are to be worn.
e)
When opening up gas banks, you should stand to one side and look away from the valve whilst it is opened.
Always cascade the OXYGEN into the O2/N2 pack first, ensuring that the valve on the OXYGEN pack meters the control of the OXYGEN, and not on the Nitrox pack, thus the O2 hose will only be subjected to medium pressure, ie. Open the Nitrox pack up fully, and slowly add OXYGEN by opening the valve on the OXYGEN pack. After the correct amount of oxygen has been CASCADED into the Nitrox pack, secure the oxygen supply, vent the hose slowly, remove the oxygen hose and insert plug, then pump up the pack with compressed air to the desired working pressure. Gas packs MUST be laid horizontally before, during and after mixing. After mixing, leave a minimum of 24 hours before analysing. If the desired mixture is not obtained, preference should be given to using the mixture as it is, providing a suitable EAD can be derived from the mix. Re-mixing may entail an undesirable delay in stabilization. Always ensure that on completion of mixing operations, gas packs are correctly marked with reference to colour coding and contents, ie. 40%/O2/60%N2, this is in accordance with The Diving Operations at Work Regulations 1981, regulation 12 (5) which states “Each gas cylinder used in a diving operation shall be legibly marked with the name and the chemical formula of its contents.”
6.0
MIXING GAS
G:\Qa\Diving\Dpr99484
19/6/09
7 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
It is anticipated that the two standards O2/N2 mixes, ie. 40%O2/60%N2 and 32%O2/68%N2 will be mixed on site. To aid correct computation of oxygen and air to be added to derive the desired mixes, two methods have been adopted, one entitled “Step by Step Mixing Instructions”, which incorporates calculation sheets (see section 7.0), the other, which is more direct, is a set of gas mixing tables headed “CALCULATION SHEET FOR MIXING.” The gas mixing tables are designed for use when an existing pack of 40/60, or 32/68 is being increased in pressure only to a predetermined working pressure, and the O2 content is unaltered. For each mixture, there are 5 different tables, which allow for a final working pressure of between 2200 and 3000 psi in 200-psi increments. The tables are in 20 psi increments, and although they cater for a re-mix of up to 3000 psi, the highest “Start” pre-mix in the tables is 2000 psi, it is felt that at pressures above 2000 psi, it is unlikely that any further mixing would be carried out. The gas mixing tables are divided into 3 columns, headed GAS, OXY, AIR, and have the following meanings:GAS
Initial gas pressure of pack
OXY
Final pressure after CASCADING correct amount of oxygen into the pack
AIR
Final pressure to pump pack up to with AIR to derive correct mixture
G:\Qa\Diving\Dpr99484
19/6/09
8 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
EXAMPLE A gas pack containing 1140 psi of 40%O2/60%N2 requires to be made up to its working pressure of 2200 psi whilst retaining the original gas mixture. Step 1
Locate 1140 psi under the column headed GAS
Step 2
To the right of the column headed OXY identify 1395 psi. This is the final pressure after CASCADING the correct amount of Oxygen.
Step 3
To the right of 1395 under the column headed AIR identify 2200 psi, this is the final pressure of the pack after adding the correct amount of air.
In order to achieve complete and accurate gas mixing within a reasonable period of time, gas packs MUST be laid horizontally for mixing, and are to remain horizontal for at least 24 hours after mixing, ideally they should remain in the horizontal position period.
G:\Qa\Diving\Dpr99484
19/6/09
9 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
7.0
Revision: 0
STEP BY STEP MIXING INSTRUCTIONS If gas mixing is to be conducted without reference to the tables described in Section 6.0 then the MANUAL GAS MIXING SHEET should be used. The MANUAL GAS MIXING SHEET should be completed by filling in the boxes in ascending numerical order starting with box No.1. BOX NO
G:\Qa\Diving\Dpr99484
BOX ENTRY
1.
Enter initial mix, ie. 40/60. (O2/N2)
2.
Enter PSI of initial mix.
3.
Enter PSI of O2 in initial mix by multiplying PSI from box 2 by the O2 content, ie., 40, and divide the answer by 100.
4.
Enter PSI of N2 in initial mix by deducting figure in box 3 from the figure in box 2.
5.
Enter desired mix, ie. 40/60. (O2/N2)
6.
Enter PSI of desired mix.
7.
Enter PSI of O2 in desired mix by multiplying PSI from box 6 by the O2 content, ie., 40, and divide the answer by 100.
8.
Enter Psi of N2 in desired mix by deducting figure in box 7 from the figure in box 6.
9.
Enter result of box 8 minus box 4.
10.
Enter the result of box 9 multiplied by 21, and divided by 79.
11.
Enter result of box 7 less total of box’s 3 & 10.
12.
Enter the result from box 11.
13.
Enter the sum of box 9 & 10.
19/6/09
10 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
•
Revision: 0
If the total of box 3 & 10 exceed the figure in box 7, then the mix cannot be achieved unless the initial pack pressure is decreased, or the final pack pressure increased.
The results in box’ s 12 and 13 indicate how much oxygen and air to add to our original mix to derive the final mix at 2200 psi. As an example, consider the following gas mix calculations:Initial Mix: 1000 psi of 40/60 O2/N2 Desired Mix: 2200 psi of 40/60 O2/N2 The following would therefore be entered into the boxes:1. 2. 3. 4.
40/60 1000 400 600
5. 6. 7. 8.
40/60 9. 2200 10. 880 11. 1320 12.
720 191 289 289
13.
911
In this example, we will need to add 289 psi of oxygen (answer in box 12), and 911 psi of air (answer in box 13)
G:\Qa\Diving\Dpr99484
19/6/09
11 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
8.0
Revision: 0
CHECKING THE ANSWERS
Before any mixing takes place, it is imperative that the calculation is checked this is accomplished in two ways: 1. 2.
Re-check all workings, and Confirm that the gases added will derive the desired mix.
Proceed as follows: After re-checking all workings, check that the following are correct (numbers refer to the entries in the box’s):a) Total of 2, 12 and 13 = 6 b) Total of 3, 10 and 11 = 7 c) Total of 4 and 9 =8 This being the case, then the desired mixture will be correct.
G:\Qa\Diving\Dpr99484
19/6/09
12 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
9.0
Revision: 0
MANUAL GAS MIXING SHEET
O2/N2 1
PSI 2
PSI O2 3
PSI N2 4
PSI TO ADD
INITIAL MIX 11
12 02
10
9
13 AIR
5
6
7
8
DESIRED MIX After completing this manual gas mixing sheet box’s 12 & 13 indicate respectively how much Oxygen and Air in PSI, to add to the initial mix to derive the desired mix.
G:\Qa\Diving\Dpr99484
19/6/09
13 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
10.0
Revision: 0
OPERATIONAL PROCEDURES – SURFACE ORIENTATED DIVING
During all diving operations, the diver’s on line gas supply is to be continuously analysed for O2 content, with Hi/Lo audio/visual alarms fitted. During all diving operations there will be a back up supply of an appropriate Nitrox mix on line to the divers gas supply panel, and if a third supply is deemed necessary, this should also be Nitrox. The divers bailout bottle and any stage gas will also contain the same Nitrox mix as the diver is breathing. Although there are a number of variables to take into consideration in the event the diver does breathe air under pressure during the dive, ie., incorrect gas mixture on line, in the event the diver does breathe air at any time during a dive, the following is to be strictly adhered to:Abort the dive and decompress the diver as though he had breathed AIR throughout the entire dive.
G:\Qa\Diving\Dpr99484
19/6/09
14 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
11.0
Revision: 0
OPERATIONAL PROCEDURES – BELL DIVING
If an EAD dive is to be conducted from a diving bell, precautions are to be taken to ensure that the bell atmosphere does not exceed 25% Oxygen, this is to eliminate the fire risk. In order to determine the correct decompression profile to be used, bearing in mind that the diver may spend some time in the bell breathing air., then conduct his dive on a Nitrox mix, the depth of the bell, and the EAD of the diver must be taken into consideration, and the deepest of the two used for decompression purposes. When considering the bell depth, always assume it contains 21%, do not attempt to calculate bell EAD based on a higher oxygen percent, which may be present in the bell. In order to simplify operational planning, if the working depth of the dive is known in advance, then the bell should be positioned at the Equivalent Air Depth of the dive. However, 3 situations may exist during the bell EAD diving:The bell depth may be SHALLOWER than the EAD of the dive The bell depth may be DEEPER than the EAD of the dive The bell depth may be EQUAL to the EAD of the dive In all 3 situations, the deepest depth taking into account the bell and lockout divers depth must be used for decompression purposes. In the event the diver breathes AIR during his downward excursion dive from the bell, then decompression is to be carried out as though the diver had breathed AIR throughout the entire dive, ie. if the diver is working at 50 fsw breathing a 40% O2 mixture with a corresponding EAD of 30 fsw, and for any period of time during the dive breathes AIR, then he will be decompressed as if he had dived to 50 fsw breathing AIR.
G:\Qa\Diving\Dpr99484
19/6/09
15 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
12.0
Revision: 0
EAD CALCULATION 40%O2/60%N2
The following tables are used to derive the Equivalent Air Depth of a dive based on a 40% oxygen percent in the divers breathing gas, with allowances of + 8% for mismixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent, the point of intersection will indicate the divers Equivalent Air Depth, this depth is then used for planning the dive, and for subsequent decompression purposes. In table 1A, ** denotes that the PPO2 exceeds 1.4 ATA, and is not to be used for operational diving. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross-referencing Table 1A, the resulting Equivalent Air Depth is found to be 37 fsw.
G:\Qa\Diving\Dpr99484
19/6/09
16 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1A EQUIVALENT AIR DEPTH
DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
20
12
11
9
8
7
22
14
12
11
10
24
16
14
13
26
17
16
28
19
30
44
46
48
5
4
3
1
8
7
5
4
3
11
10
8
7
5
4
14
13
11
10
8
7
5
17
16
14
13
11
10
8
7
21
19
18
16
14
13
11
10
8
32
22
21
19
18
16
14
13
11
9
34
24
22
21
19
17
16
14
12
11
36
26
24
22
21
19
17
15
14
12
38
28
26
24
22
20
19
17
15
13
40
29
27
26
24
22
20
18
16
15
42
31
29
27
25
23
22
20
18
16
44
33
31
29
27
25
23
21
19
17
46
35
33
31
29
27
25
23
21
19
48
36
34
32
30
28
26
24
22
20
50
38
36
34
32
30
27
25
23
21
52
40
38
35
33
31
29
27
25
22
54
41
39
37
35
33
30
28
26
24
G:\Qa\Diving\Dpr99484
19/6/09
17 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1A EQUIVALENT AIR DEPTH
DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
56
43
41
39
36
34
58
45
43
40
38
60
47
44
42
62
48
46
64
50
66
44
46
48
32
30
27
25
36
33
31
29
26
39
37
35
32
30
28
43
41
39
36
34
31
29
48
45
43
40
38
35
33
**
52
49
47
44
42
39
37
34
**
68
53
51
48
46
43
41
38
**
**
70
55
53
50
47
45
42
40
**
**
72
57
54
52
49
46
44
41
**
**
74
59
56
53
50
48
45
**
**
**
76
60
58
55
52
49
47
**
**
**
78
62
59
56
54
51
**
**
**
**
80
64
61
58
55
52
**
**
**
**
82
65
63
60
57
54
**
**
**
**
84
67
64
61
58
**
**
**
**
**
86
69
66
63
60
**
**
**
**
**
88
71
68
65
61
**
**
**
**
**
90
72
69
66
**
**
**
**
**
**
G:\Qa\Diving\Dpr99484
19/6/09
18 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
13.0
Revision: 0
PPO2 CALCULATION FOR 40%O2/60%N2
The following table identified as Table 1B, is used to derive the partial Pressure of Oxygen in the divers breathing gas, with allowances of + 8% for mis-mixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers partial Pressure of Oxygen, the resulting partial pressure of Oxygen is used to determine maximum bottom time. In Table 1B, figures to the right of the stepped line indicate those PPO2’s that exceed 1.4 ATA. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross referencing Table 1B, the resulting Partial Pressure of Oxygen is found to be 1.12 ATA.
G:\Qa\Diving\Dpr99484
19/6/09
19 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1B PARTIAL PRESSURE OF OXYGEN DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
20
0.51
0.54
0.57
0.61
0.64
22
0.53
0.56
0.60
0.63
24
0.55
0.58
0.62
26
0.57
0.60
28
0.59
30
44
46
48
0.67
0.70
0.73
0.77
0.66
0.70
0.73
0.76
0.80
0.65
0.69
0.72
0.76
0.79
0.82
0.64
0.67
0.71
0.75
0.78
0.82
0.85
0.62
0.66
0.70
0.73
0.77
0.81
0.85
0.88
0.61
0.64
0.68
0.72
0.76
0.80
0.84
0.87
0.91
32
0.63
0.66
0.70
0.74
0.78
0.82
0.86
0.90
0.94
34
0.64
0.69
0.73
0.77
0.81
0.85
0.89
0.93
0.97
36
0.66
0.71
0.75
0.79
0.83
0.87
0.92
0.96
1.00
38
0.68
0.73
0.77
0.81
0.86
0.90
0.94
0.98
1.03
40
0.70
0.75
0.79
0.84
0.88
0.92
0.97
1.01
1.06
42
0.72
0.77
0.81
0.86
0.90
0.95
0.99
1.04
1.09
44
0.74
0.79
0.83
0.88
0.93
0.97
1.02
1.07
1.12
46
0.76
0.81
0.86
0.90
0.95
1.00
1.05
1.10
1.14
48
0.78
0.83
0.88
0.93
0.98
1.03
1.09
1.12
1.17
50
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
52
0.82
0.87
0.92
0.97
1.03
1.08
1.13
1.18
1.23
54
0.84
0.89
0.94
1.00
1.05
1.10
1.16
1.21
1.26
G:\Qa\Diving\Dpr99484
19/6/09
20 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1B PARTIAL PRESSURE OF OXYGEN DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
56
0.86
0.91
0.97
1.02
1.07
58
0.88
0.93
0.99
1.04
60
0.90
0.95
1.01
62
0.92
0.97
64
0.94
66
44
46
48
1.13
1.18
1.24
1.29
1.10
1.15
1.21
1.26
1.32
1.07
1.12
1.18
1.24
1.29
1.35
1.03
1.09
1.15
1.20
1.26
1.32
1.38
0.99
1.05
1.11
1.17
1.23
1.29
1.35
1.41
0.96
1.02
1.08
1.14
1.20
1.26
1.32
1.38
1.44
68
0.97
1.04
1.10
1.16
1.22
1.28
1.34
1.40
1.46
70
0.99
1.06
1.12
1.18
1.24
1.31
1.37
1.43
1.49
72
1.01
1.08
1.14
1.20
1.27
1.33
1.40
1.46
1.52
74
1.03
1.10
1.16
1.23
1.29
1.36
1.42
1.49
1.55
76
1.05
1.12
1.18
1.25
1.32
1.38
1.45
1.51
1.58
78
1.07
1.14
1.21
1.27
1.34
1.41
1.48
1.54
1.61
80
1.09
1.16
1.23
1.30
1.36
1.43
1.50
1.57
1.64
82
1.11
1.18
1.25
1.32
1.39
1.46
1.53
1.60
1.67
84
1.13
1.20
1.27
1.34
1.41
1.48
1.56
1.63
1.70
86
1.15
1.22
1.29
1.37
1.44
1.51
1.58
1.65
1.73
88
1.17
1.24
1.32
1.39
1.46
1.54
1.61
1.68
1.76
90
1.19
1.26
1.34
1.41
1.49
1.56
1.64
1.71
1.78
G:\Qa\Diving\Dpr99484
19/6/09
21 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
14.0
Revision: 0
CALCULATION SHEETS FOR MIXING 40%O2/60%N2
The following tables are used to derive the amount of Oxygen and Air to add to a pack of gas containing a pre-mixed gas, and to re-mix it back up to a pre-determined final working pressure. The gas mixing tables are divided into 3 columns, headed GAS, OXY, AIR, and have the following meanings:GAS
Initial gas pressure of pack
OXY
Final pressure after CASCADING correct amount of oxygen into the pack.
AIR
Final pressure to pump pack up to with AIR to derive correct mixture.
EXAMPLE A gas pack containing 1140 psi of 40%O2/60%N2 requires to be made up to its working pressure of 2200 psi whilst retaining the original gas mixture. Step 1
G:\Qa\Diving\Dpr99484
Locate 1140 psi under the column headed GAS Step 2
To the right under the column headed OXY identify 1395 psi. This is the final pressure after CASCADING the correct amount of Oxygen.
Step 3
To the right of 1395 under the column headed AIR identify 2200 psi, this is final pressure of the pack after adding the correct amount of air.
19/6/09
22 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 BACK TO 40%O2/60%N2 AT
2600 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
641 656 671 686 701 716 732 747 762 777 792 808 823 838 853 868 884 899 914 929 944 959 975 990 1005
G:\Qa\Diving\Dpr99484
AIR GAS 2600 520 2600 540 2600 560 2600 580 2600 600 2600 620 2600 640 2600 660 2600 680 2600 700 2600 720 2600 740 2600 760 2600 780 2600 800 2600 820 2600 840 2600 860 2600 880 2600 900 2600 920 2600 940 2600 960 2600 980 2600 1000
OXY
AIR GAS
OXY
1020 1035 1051 1066 1081 1096 1111 1127 1142 1157 1172 1187 1203 1218 1233 1248 1263 1278 1294 1309 1324 1339 1354 1370 1385
2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
1400 1415 1430 1446 1461 1476 1491 1506 1522 1537 1552 1567 1582 1597 1613 1628 1643 1658 1673 1689 1704 1719 1734 1749 1765
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
AIR GAS 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1780 1795 1810 1825 1841 1856 1871 1886 1901 1916 1932 1947 1962 1977 1992 2008 2023 2038 2053 2068 2084 2099 2114 2129 2144
AIR 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
23 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 BACK TO 40%O2/60%N2 AT
2400 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
592 608 623 638 653 668 684 699 714 729 744 759 775 790 805 820 835 851 866 881 896 911 927 942 957
G:\Qa\Diving\Dpr99484
AIR GAS 2400 520 2400 540 2400 560 2400 580 2400 600 2400 620 2400 640 2400 660 2400 680 2400 700 2400 720 2400 740 2400 760 2400 780 2400 800 2400 820 2400 840 2400 860 2400 880 2400 900 2400 920 2400 940 2400 960 2400 980 2400 1000
OXY 972 987 1003 1018 1033 1048 1063 1078 1094 1109 1124 1139 1154 1170 1185 1200 1215 1230 1246 1261 1276 1291 1306 1322 1337
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1352 1367 1382 1397 1413 1428 1443 1458 1473 1489 1504 1519 1534 1549 1565 1580 1595 1610 1625 1641 1656 1671 1686 1701 1716
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1732 1747 1762 1777 1792 1808 1823 1838 1853 1868 1884 1899 1914 1929 1944 1959 1975 1990 2005 2020 2035 2051 2066 2081 2096
AIR 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
24 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 BACK TO 40%O2/60%N2 AT
2200 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
544 559 575 590 605 620 635 651 666 681 696 711 727 742 757 772 787 803 818 833 848 863 878 894 909
G:\Qa\Diving\Dpr99484
AIR GAS 2200 520 2200 540 2200 560 2200 580 2200 600 2200 620 2200 640 2200 660 2200 680 2200 700 2200 720 2200 740 2200 760 2200 780 2200 800 2200 820 2200 840 2200 860 2200 880 2200 900 2200 920 2200 940 2200 960 2200 980 2200 1000
OXY 924 939 954 970 985 1000 1015 1030 1046 1061 1076 1091 1106 1122 1137 1152 1167 1182 1197 1213 1228 1243 1258 1273 1289
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1304 1319 1334 1349 1365 1380 1395 1410 1425 1441 1456 1471 1486 1501 1516 1532 1547 1562 1577 1592 1608 1623 1638 1653 1668
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1684 1699 1714 1729 1744 1759 1775 1790 1805 1820 1835 1851 1866 1881 1896 1911 1927 1942 1957 1972 1987 2003 2018 2033 2048
AIR 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
25 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
15.0
Revision: 0
EAD CALCULATION FOR 32%O2/68%N2 The following tables are used to derive the Equivalent Air Depth of a dive based on a 32% oxygen percent in the divers breathing gas, with allowances of + 8% for mismixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers Equivalent Air Depth, this depth is then used for planning the dive, and for subsequent decompression purposes. In the table ** denotes that the PPO2 exceeds 1.4 ATA, and is not to be used for operational diving. EXAMPLE A dive is to be conducted to 94 fsw breathing a mixture containing 32% oxygen, by cross-referencing Table 2A, the resulting Equivalent Air Depth is found to be 76 fsw.
G:\Qa\Diving\Dpr99484
19/6/09
26 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 2A EQUIVALENT AIR DEPTH DEPTH FSW
OXYGEN PERCENT 30 32 34
24
26
28
20
17
16
15
13
12
22
19
18
17
15
24
21
20
18
26
23
22
28
25
30
36
38
40
11
9
8
7
14
12
11
10
8
17
16
14
13
11
10
20
19
17
16
14
13
11
24
22
21
19
17
16
14
13
27
26
24
22
21
19
18
16
14
32
29
27
26
24
22
21
19
18
16
34
31
29
28
26
24
22
21
19
17
36
33
31
29
28
26
24
22
21
19
38
35
33
31
29
28
26
24
22
20
40
37
35
33
31
29
27
26
24
22
42
39
37
35
33
31
29
27
25
23
44
41
39
37
35
33
31
29
27
25
46
43
41
39
37
35
33
31
29
27
48
44
42
40
38
36
34
32
30
28
50
46
44
42
40
38
36
34
32
30
52
48
46
44
42
40
38
35
33
31
54
50
48
46
44
41
39
37
35
33
TABLE 2A G:\Qa\Diving\Dpr99484
19/6/09
27 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
EQUIVALENT AIR DEPTH DEPTH FSW
OXYGEN PERCENT 30 32 34
24
26
28
56
52
50
48
45
43
58
54
52
49
47
60
56
54
51
62
58
55
64
60
66
36
38
40
41
39
36
34
45
43
40
38
36
49
47
44
42
39
37
53
51
48
46
43
41
39
57
55
52
50
48
45
43
40
62
59
57
54
52
49
47
44
42
68
64
61
59
56
53
51
48
46
43
70
66
63
60
58
55
53
50
47
45
72
68
65
62
60
57
54
52
49
46
74
69
67
64
61
59
56
53
50
48
76
71
69
66
63
60
58
55
52
49
78
73
70
68
65
62
59
56
54
51
80
75
72
69
67
64
61
58
55
52
82
77
74
71
68
65
63
60
57
54
84
79
76
73
70
67
64
61
58
**
86
81
78
75
72
69
66
63
60
**
88
83
80
77
74
71
68
65
61
**
90
85
82
79
75
72
69
66
**
**
TABLE 2A EQUIVALENT AIR DEPTH G:\Qa\Diving\Dpr99484
19/6/09
28 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
DEPTH FSW
24
26
28
OXYGEN PERCENT 30 32 34
92
87
84
80
77
74
94
89
85
82
79
96
91
87
84
98
93
89
100
94
102
36
38
40
71
68
**
**
76
73
69
**
**
81
78
74
71
**
**
86
83
79
76
**
**
**
91
88
84
81
78
**
**
**
96
93
90
86
83
79
**
**
**
104
98
95
91
88
84
**
**
**
**
106
100
97
93
90
86
**
**
**
**
108
102
99
95
91
88
**
**
**
**
110
104
100
97
93
90
**
**
**
**
112
106
102
99
95
91
**
**
**
**
114
108
104
100
97
**
**
**
**
**
116
110
106
102
99
**
**
**
**
**
118
112
108
104
100
**
**
**
**
**
120
114
110
106
102
**
**
**
**
**
G:\Qa\Diving\Dpr99484
19/6/09
29 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
16.0
Revision: 0
PPO2 CALCULATION FOR 32%O2/68%N2
The following table identified as table 2B, is used to derive the Partial Pressure of Oxygen in the divers breathing gas, with allowances of + 8% for mis-mixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent, and the point of intersection will indicate the Partial Pressure of Oxygen, the resulting Partial Pressure of Oxygen is used to determine maximum bottom time. In the table figures to the right of the stepped line indicate those PPO2’s that exceed 1.4 ATA. EXAMPLE A dive is to be conducted to 94 fsw breathing a mixture containing 32% oxygen, by cross-referencing Table 2B, the resulting Partial Pressure of Oxygen is found to be 1.23.
G:\Qa\Diving\Dpr99484
19/6/09
30 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 2B PARTIAL PRESSURE OF OXYGEN DEPTH FSW
24
26
28
OXYGEN PERCENT 30 32 34
20
0.38
0.41
0.44
0.48
0.51
22
0.40
0.43
0.46
0.50
24
0.41
0.44
0.48
26
0.42
0.46
28
0.44
30
36
38
40
0.54
0.57
0.61
0.64
0.53
0.56
0.60
0.63
0.66
0.51
0.55
0.58
0.62
0.65
0.69
0.50
0.53
0.57
0.60
0.64
0.67
0.71
0.48
0.51
0.55
0.59
0.62
0.66
0.70
0.73
0.45
0.49
0.53
0.57
0.61
0.64
0.68
0.72
0.76
32
0.47
0.51
0.55
0.59
0.63
0.66
0.70
0.74
0.78
34
0.48
0.52
0.56
0.60
0.64
0.69
0.73
0.77
0.81
36
0.50
0.54
0.58
0.62
0.66
0.71
0.75
0.79
0.83
38
0.51
0.55
0.60
0.64
0.68
0.73
0.77
0.81
0.86
40
0.53
0.57
0.61
0.66
0.70
0.75
0.79
0.84
0.88
42
0.54
0.59
0.63
0.68
0.72
0.77
0.81
0.86
0.90
44
0.55
0.60
0.65
0.69
0.74
0.79
0.83
0.88
0.93
46
0.57
0.62
0.67
0.71
0.76
0.81
0.86
0.90
0.95
48
0.58
0.63
0.68
0.73
0.78
0.83
0.88
0.93
0.98
50
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
52
0.61
0.66
0.72
0.77
0.82
0.87
0.92
0.97
1.03
54
0.63
0.68
0.73
0.79
0.84
0.89
0.94
1.00
1.05
TABLE 2B G:\Qa\Diving\Dpr99484
19/6/09
31 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
PARTIAL PRESSURE OF OXYGEN DEPTH FSW
OXYGEN PERCENT 30 32 34
24
26
28
56
0.64
0.70
0.75
0.80
0.86
58
0.66
0.71
0.77
0.82
60
0.67
0.73
0.78
62
0.69
0.74
64
0.70
66
36
38
40
0.91
0.97
1.02
1.07
0.88
0.93
0.99
1.04
1.10
0.84
0.90
0.95
1.01
1.07
1.12
0.80
0.86
0.92
0.97
1.03
1.09
1.15
0.76
0.82
0.88
0.94
0.99
1.05
1.11
1.17
0.72
0.78
0.84
0.90
0.96
1.02
1.08
1.14
1.20
68
0.73
0.79
0.85
0.91
0.97
1.04
1.10
1.16
1.22
70
0.74
0.81
0.87
0.93
0.99
1.06
1.12
1.18
1.24
72
0.76
0.82
0.89
0.95
1.01
1.08
1.14
1.20
1.27
74
0.77
0.84
0.90
0.97
1.03
1.10
1.16
1.23
1.29
76
0.79
0.85
0.92
0.99
1.05
1.12
1.18
1.25
1.32
78
0.80
0.87
0.94
1.00
1.07
1.14
1.21
1.27
1.34
80
0.82
0.89
0.95
1.02
1.09
1.16
1.23
1.30
1.36
82
0.83
0.90
0.97
1.04
1.11
1.18
1.25
1.32
1.39
84
0.85
0.92
0.99
1.06
1.13
1.20
1.27
1.34
1.41
86
0.86
0.93
1.00
1.08
1.15
1.22
1.29
1.37
1.44
88
0.89
0.95
1.02
1.10
1.17
1.24
1.32
1.39
1.46
90
0.89
0.96
1.04
1.11
1.19
1.26
1.34
1.41
1.49
TABLE 2B PARTIAL PRESSURE OF OXYGEN G:\Qa\Diving\Dpr99484
19/6/09
32 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
17.0
DEPTH FSW
24
26
28
92
0.90
0.98
1.06
1.13
1.21
94
0.92
1.00
1.07
1.15
96
0.93
1.01
1.09
98
0.95
1.03
100
0.96
102
Revision: 0
OXYGEN PERCENT 30 32 34
36
38
40
1.28
1.36
1.43
1.51
1.23
1.30
1.38
1.46
1.53
1.17
1.25
1.32
1.40
1.48
1.56
1.11
1.19
1.27
1.34
1.42
1.50
1.58
1.04
1.12
1.20
1.28
1.37
1.45
1.53
1.61
0.98
1.06
1.14
1.22
1.30
1.39
1.47
1.55
1.63
104
0.99
1.07
1.16
1.24
1.32
1.41
1.49
1.57
1.66
106
1.01
1.09
1.17
1.26
1.34
1.43
1.51
1.60
1.68
108
1.02
1.11
1.19
1.28
1.36
1.45
1.53
1.62
1.70
110
1.04
1.12
1.21
1.30
1.38
1.47
1.56
1.64
1.73
112
1.05
1.14
1.23
1.31
1.40
1.49
1.58
1.66
1.75
114
1.06
1.15
1.24
1.33
1.42
1.51
1.60
1.69
1.78
116
1.08
1.17
1.26
1.35
1.44
1.53
1.62
1.71
1.80
118
1.09
1.18
1.28
1.37
1.46
1.55
1.64
1.73
1.83
120
1.11
1.20
1.29
1.39
1.48
1.57
1.66
1.76
1.85
CALCULATION SHEETS FOR MIXING 32%O2/68%N2
The following tables are used to derive the amount of Oxygen and Air to add to a pack of gas containing a pre-mixed gas, and to re-mix it back up to a pre-determined final working pressure. The gas mixing tables are divided into 3 columns, headed GAS, OXY, AIR, and have the following meanings:G:\Qa\Diving\Dpr99484
19/6/09
33 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
GAS
Revision: 0
Initial gas pressure of pack
OXY
Final pressure after CASCADING correct amount of oxygen into the pack.
AIR
Final pressure to pump pack up to with AIR to derive correct mixture.
EXAMPLE A gas pack containing 1140 psi of 32%O2/68%N2 requires to be made up to its working pressure of 2200 psi whilst retaining the original gas mixture. Step 1
G:\Qa\Diving\Dpr99484
Locate 1140 psi under the column headed GAS
Step 2
To the right under the column headed OXY identify 1288 psi. This is the final pressure after CASCADING the correct amount of Oxygen.
Step 3
To the right of 1288 under the column headed AIR identify 2200 psi, this is the final pressure of the pack after adding the correct amount of air.
19/6/09
34 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 BACK TO 32%O2/68%N2 AT
2600 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
641 656 671 686 701 716 732 747 762 777 792 808 823 838 853 868 884 899 914 929 944 959 975 990 1005
G:\Qa\Diving\Dpr99484
AIR GAS 2600 520 2600 540 2600 560 2600 580 2600 600 2600 620 2600 640 2600 660 2600 680 2600 700 2600 720 2600 740 2600 760 2600 780 2600 800 2600 820 2600 840 2600 860 2600 880 2600 900 2600 920 2600 940 2600 960 2600 980 2600 1000
OXY 1020 1035 1051 1066 1081 1096 1111 1127 1142 1157 1172 1187 1203 1218 1233 1248 1263 1278 1294 1309 1324 1339 1354 1370 1385
AIR GAS 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1400 1415 1430 1446 1461 1476 1491 1506 1522 1537 1552 1567 1582 1597 1613 1628 1643 1658 1673 1689 1704 1719 1734 1749 1765
AIR GAS 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1780 1795 1810 1825 1841 1856 1871 1886 1901 1916 1932 1947 1962 1977 1992 2008 2023 2038 2053 2068 2084 2099 2114 2129 2144
AIR 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
35 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 BACK TO 32%O2/68%N2 AT
2400 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
592 608 623 638 653 668 684 699 714 729 744 759 775 790 805 820 835 851 866 881 896 911 927 942 957
G:\Qa\Diving\Dpr99484
AIR GAS 2400 520 2400 540 2400 560 2400 580 2400 600 2400 620 2400 640 2400 660 2400 680 2400 700 2400 720 2400 740 2400 760 2400 780 2400 800 2400 820 2400 840 2400 860 2400 880 2400 900 2400 920 2400 940 2400 960 2400 980 2400 1000
OXY 972 987 1003 1018 1033 1048 1063 1078 1094 1109 1124 1139 1154 1170 1185 1200 1215 1230 1246 1261 1276 1291 1306 1322 1337
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1352 1367 1382 1397 1413 1428 1443 1458 1473 1489 1504 1519 1534 1549 1565 1580 1595 1610 1625 1641 1656 1671 1686 1701 1716
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1732 1747 1762 1777 1792 1808 1823 1838 1853 1868 1884 1899 1914 1929 1944 1959 1975 1990 2005 2020 2035 2051 2066 2081 2096
AIR 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
36 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 BACK TO 32%O2/68%N2 AT
2200 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
544 559 575 590 605 620 635 651 666 681 696 711 727 742 757 772 787 803 818 833 848 863 878 894 909
G:\Qa\Diving\Dpr99484
AIR GAS 2200 520 2200 540 2200 560 2200 580 2200 600 2200 620 2200 640 2200 660 2200 680 2200 700 2200 720 2200 740 2200 760 2200 780 2200 800 2200 820 2200 840 2200 860 2200 880 2200 900 2200 920 2200 940 2200 960 2200 980 2200 1000
OXY 924 939 954 970 985 1000 1015 1030 1046 1061 1076 1091 1106 1122 1137 1152 1167 1182 1197 1213 1228 1243 1258 1273 1289
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1304 1319 1334 1349 1365 1380 1395 1410 1425 1441 1456 1471 1486 1501 1516 1532 1547 1562 1577 1592 1608 1623 1638 1653 1668
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1684 1699 1714 1729 1744 1759 1775 1790 1805 1820 1835 1851 1866 1881 1896 1911 1927 1942 1957 1972 1987 2003 2018 2033 2048
AIR 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
37 of 37
Revision: 0
Global Offshore Pty Ltd
EAD EQUIVALENT AIR DEPTH DIVING MANUAL PA-D-PR-99484
Unless signed and stamped ‘controlled’ this document is current only for the date as shown at the bottom of the page.
Copy No.: Distributed to:
Rev
Description
Date
Prepared
Checked
Approved
A
Issued for Approval
17/9/99
CR
MY
CR
0
Issued for Use
22/9/99
SW
MY
PH
CONTENTS
G:\Qa\Diving\Dpr99484
19/6/09
1 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
1.0
INTRODUCTION
2.0
DETERMINATION OF CORRECT EAD SCHEDULE
3.0
DETERMINATION OF PPO2
4.0
DETERMINATION OF BOTTOM TIME
5.0
SAFETY PRECAUTIONS WHEN MIXING GAS
6.0
MIXING GAS
7.0
STEP BY STEP MIXING INSTRUCTIONS
8.0
CHECKING THE ANSWERS
9.0
MANUAL GAS MIXING SHEET
10.0
OPERATIONAL PROCEDURES – SURFACE ORIENTATED DIVING
11.0
OPERATIONAL PROCEDURES – BELL DIVING
12.0
EAD CALCULATION FOR 40%O2/60%N2 (TABLE 1A)
13.0
PPO2 CALCUALTION FOR 40%O2/60%N2 (TABLE 1B)
14.0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 (TABLE 1C & 1D)
15.0
EAD CALCULATION FOR 32%O2/68%N2 (TABLE 2A)
16.0
PPO2 CALCULATION FOR 32%O2/68%N2 (TABLE 2B)
17.0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 (TABLE 2C & 2D)
18.0
THERAPEUTIC PROCEDURES
G:\Qa\Diving\Dpr99484
19/6/09
Revision: 0
2 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
1.0
Revision: 0
INTRODUCTION Equivalent Air Depth or Nitrox diving is the technique whereby the O2 in the breathing mixture is elevated above 21%, and the balance of N2 reduced proportionally. Due to the reduction in the nitrogen content in the breathing mixture, a diver may work longer at set depth than a diver breathing air and have a lower N2 uptake. A diver working at 70 fsw / 21 meters breathing a 40%O2 / 60%N2 mixture is breathing a gas containing the same partial pressure of nitrogen as a diver working 45 fsw / 13.5 meters, and would therefore decompress on the same schedule as a diver working at 45 fsw / 13.5 meters. Nitrox diving is carried out using the same principles as surface orientated air diving. Once the EAD has been calculated, the diver profile should run in accordance with the Standard Air Diving Tables as though it was an air dive. With the high oxygen percentage involved with Nitrox diving, all diving components in contact with Nitrox are to be O2 cleaned to minimise the possibility of an oxygen explosion. During Nitrox diving the following will be adhered to: • Oxygen analyser monitoring the divers breathing mixture at all times. • Two (2) independent supplies of Nitrox to the working diver or divers. • Supply to the standby diver to be separate source from the divers breathing supplies. • No smoking in the control van. • Oxygen analyser monitoring the control van • Diver’s bailout content to be Nitrox. • Diver’s stage bottles content to be Nitrox. • Diver tethers - gas supply hose to be O2 cleaned. • Diver bailouts - to be O2 cleaned. • Diver 1st stage regulators – to be O2 cleaned.
G:\Qa\Diving\Dpr99484
19/6/09
3 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
2.0
Revision: 0
DETERMINATION OF CORRECT EAD SCHEDULES Although infinitely variable, operationally, 2 Nitrox mixtures are deemed to be suitable for EAD diving by the company, they are as follows: 40%O2/60%N2 Depth range: 32%O2/68%N2 Depth range:
0 – 80 fsw 80 – 110 fsw
In order to determine the correct EAD schedule, Table 1A or 2A should be consulted. The optimum gas mix is shown in the centre column with allowances for + 8% on either side for a miss mix situation. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers Equivalent Air Depth, this depth is then used for planning the dive, and for subsequent decompression purposes. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross reference Table 1A, the resulting Equivalent Air Depth is found to be 37 fsw. Table 1A is designed to show the optimum oxygen mixture of 40%, which appears in the centre column, flanked on either side by + 8%, to allow for gas mixing errors, and table 2B is designed to show the optimum oxygen mixture of 32%, flanked on either side by + 8%, to allow for gas mixing errors. When calculating the EAD, it should be determined by the gas on line which has the lowest oxygen percent, should this gas then be used during the dive, recalculation will not be necessary. Although the depth range for 32%O2/68%N2 is 80 – 110 fsw, it may be used from the surface down to 110 fsw, however the benefits obtained shallower than 80 fsw are lost.
3.0
DETERMINATION OF PPO2
G:\Qa\Diving\Dpr99484
19/6/09
4 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
If the PPO2 of the divers inspired breathing gas is required to be known, then refer to table 1B or 2B, these tables are designed to show the optimum oxygen mixture of 40%, and 32%, flanked on either side by + 8%, to allow for gas mixing errors. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers Partial Pressure of oxygen. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross referencing Table 1B, the resulting Partial Pressure of Oxygen is found to be 1.12 ATA.
G:\Qa\Diving\Dpr99484
19/6/09
5 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
4.0
Revision: 0
DETERMINATION OF BOTTOM TIME
The bottom time of a surface orientated dive is governed by current Health and Safety Offshore Safety Division Diving Safety Memorandums, and these should be consulted in order that the maximum allowable bottom time can be derived.
G:\Qa\Diving\Dpr99484
19/6/09
6 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
5.0
Revision: 0
SAFETY PRECAUTIONS WHEN MIXING GAS When mixing gas, the following safety precautions are to be strictly adhered to:a)
NEVER pump oxygen.
b)
Oxygen is only to be CASCADED.
c)
Ensure all OXYGEN hoses and associated fittings are OXYGEN clean and suitable for OXYGEN use.
d)
When handling H.P. gas, ie. connecting hoses, opening valves, hard hats are to be worn, and “safety” glasses conforming to AS/NZS1337 are to be worn.
e)
When opening up gas banks, you should stand to one side and look away from the valve whilst it is opened.
Always cascade the OXYGEN into the O2/N2 pack first, ensuring that the valve on the OXYGEN pack meters the control of the OXYGEN, and not on the Nitrox pack, thus the O2 hose will only be subjected to medium pressure, ie. Open the Nitrox pack up fully, and slowly add OXYGEN by opening the valve on the OXYGEN pack. After the correct amount of oxygen has been CASCADED into the Nitrox pack, secure the oxygen supply, vent the hose slowly, remove the oxygen hose and insert plug, then pump up the pack with compressed air to the desired working pressure. Gas packs MUST be laid horizontally before, during and after mixing. After mixing, leave a minimum of 24 hours before analysing. If the desired mixture is not obtained, preference should be given to using the mixture as it is, providing a suitable EAD can be derived from the mix. Re-mixing may entail an undesirable delay in stabilization. Always ensure that on completion of mixing operations, gas packs are correctly marked with reference to colour coding and contents, ie. 40%/O2/60%N2, this is in accordance with The Diving Operations at Work Regulations 1981, regulation 12 (5) which states “Each gas cylinder used in a diving operation shall be legibly marked with the name and the chemical formula of its contents.”
6.0
MIXING GAS
G:\Qa\Diving\Dpr99484
19/6/09
7 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
It is anticipated that the two standards O2/N2 mixes, ie. 40%O2/60%N2 and 32%O2/68%N2 will be mixed on site. To aid correct computation of oxygen and air to be added to derive the desired mixes, two methods have been adopted, one entitled “Step by Step Mixing Instructions”, which incorporates calculation sheets (see section 7.0), the other, which is more direct, is a set of gas mixing tables headed “CALCULATION SHEET FOR MIXING.” The gas mixing tables are designed for use when an existing pack of 40/60, or 32/68 is being increased in pressure only to a predetermined working pressure, and the O2 content is unaltered. For each mixture, there are 5 different tables, which allow for a final working pressure of between 2200 and 3000 psi in 200-psi increments. The tables are in 20 psi increments, and although they cater for a re-mix of up to 3000 psi, the highest “Start” pre-mix in the tables is 2000 psi, it is felt that at pressures above 2000 psi, it is unlikely that any further mixing would be carried out. The gas mixing tables are divided into 3 columns, headed GAS, OXY, AIR, and have the following meanings:GAS
Initial gas pressure of pack
OXY
Final pressure after CASCADING correct amount of oxygen into the pack
AIR
Final pressure to pump pack up to with AIR to derive correct mixture
G:\Qa\Diving\Dpr99484
19/6/09
8 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
EXAMPLE A gas pack containing 1140 psi of 40%O2/60%N2 requires to be made up to its working pressure of 2200 psi whilst retaining the original gas mixture. Step 1
Locate 1140 psi under the column headed GAS
Step 2
To the right of the column headed OXY identify 1395 psi. This is the final pressure after CASCADING the correct amount of Oxygen.
Step 3
To the right of 1395 under the column headed AIR identify 2200 psi, this is the final pressure of the pack after adding the correct amount of air.
In order to achieve complete and accurate gas mixing within a reasonable period of time, gas packs MUST be laid horizontally for mixing, and are to remain horizontal for at least 24 hours after mixing, ideally they should remain in the horizontal position period.
G:\Qa\Diving\Dpr99484
19/6/09
9 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
7.0
Revision: 0
STEP BY STEP MIXING INSTRUCTIONS If gas mixing is to be conducted without reference to the tables described in Section 6.0 then the MANUAL GAS MIXING SHEET should be used. The MANUAL GAS MIXING SHEET should be completed by filling in the boxes in ascending numerical order starting with box No.1. BOX NO
G:\Qa\Diving\Dpr99484
BOX ENTRY
1.
Enter initial mix, ie. 40/60. (O2/N2)
2.
Enter PSI of initial mix.
3.
Enter PSI of O2 in initial mix by multiplying PSI from box 2 by the O2 content, ie., 40, and divide the answer by 100.
4.
Enter PSI of N2 in initial mix by deducting figure in box 3 from the figure in box 2.
5.
Enter desired mix, ie. 40/60. (O2/N2)
6.
Enter PSI of desired mix.
7.
Enter PSI of O2 in desired mix by multiplying PSI from box 6 by the O2 content, ie., 40, and divide the answer by 100.
8.
Enter Psi of N2 in desired mix by deducting figure in box 7 from the figure in box 6.
9.
Enter result of box 8 minus box 4.
10.
Enter the result of box 9 multiplied by 21, and divided by 79.
11.
Enter result of box 7 less total of box’s 3 & 10.
12.
Enter the result from box 11.
13.
Enter the sum of box 9 & 10.
19/6/09
10 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
•
Revision: 0
If the total of box 3 & 10 exceed the figure in box 7, then the mix cannot be achieved unless the initial pack pressure is decreased, or the final pack pressure increased.
The results in box’ s 12 and 13 indicate how much oxygen and air to add to our original mix to derive the final mix at 2200 psi. As an example, consider the following gas mix calculations:Initial Mix: 1000 psi of 40/60 O2/N2 Desired Mix: 2200 psi of 40/60 O2/N2 The following would therefore be entered into the boxes:1. 2. 3. 4.
40/60 1000 400 600
5. 6. 7. 8.
40/60 9. 2200 10. 880 11. 1320 12.
720 191 289 289
13.
911
In this example, we will need to add 289 psi of oxygen (answer in box 12), and 911 psi of air (answer in box 13)
G:\Qa\Diving\Dpr99484
19/6/09
11 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
8.0
Revision: 0
CHECKING THE ANSWERS
Before any mixing takes place, it is imperative that the calculation is checked this is accomplished in two ways: 1. 2.
Re-check all workings, and Confirm that the gases added will derive the desired mix.
Proceed as follows: After re-checking all workings, check that the following are correct (numbers refer to the entries in the box’s):a) Total of 2, 12 and 13 = 6 b) Total of 3, 10 and 11 = 7 c) Total of 4 and 9 =8 This being the case, then the desired mixture will be correct.
G:\Qa\Diving\Dpr99484
19/6/09
12 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
9.0
Revision: 0
MANUAL GAS MIXING SHEET
O2/N2 1
PSI 2
PSI O2 3
PSI N2 4
PSI TO ADD
INITIAL MIX 11
12 02
10
9
13 AIR
5
6
7
8
DESIRED MIX After completing this manual gas mixing sheet box’s 12 & 13 indicate respectively how much Oxygen and Air in PSI, to add to the initial mix to derive the desired mix.
G:\Qa\Diving\Dpr99484
19/6/09
13 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
10.0
Revision: 0
OPERATIONAL PROCEDURES – SURFACE ORIENTATED DIVING
During all diving operations, the diver’s on line gas supply is to be continuously analysed for O2 content, with Hi/Lo audio/visual alarms fitted. During all diving operations there will be a back up supply of an appropriate Nitrox mix on line to the divers gas supply panel, and if a third supply is deemed necessary, this should also be Nitrox. The divers bailout bottle and any stage gas will also contain the same Nitrox mix as the diver is breathing. Although there are a number of variables to take into consideration in the event the diver does breathe air under pressure during the dive, ie., incorrect gas mixture on line, in the event the diver does breathe air at any time during a dive, the following is to be strictly adhered to:Abort the dive and decompress the diver as though he had breathed AIR throughout the entire dive.
G:\Qa\Diving\Dpr99484
19/6/09
14 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
11.0
Revision: 0
OPERATIONAL PROCEDURES – BELL DIVING
If an EAD dive is to be conducted from a diving bell, precautions are to be taken to ensure that the bell atmosphere does not exceed 25% Oxygen, this is to eliminate the fire risk. In order to determine the correct decompression profile to be used, bearing in mind that the diver may spend some time in the bell breathing air., then conduct his dive on a Nitrox mix, the depth of the bell, and the EAD of the diver must be taken into consideration, and the deepest of the two used for decompression purposes. When considering the bell depth, always assume it contains 21%, do not attempt to calculate bell EAD based on a higher oxygen percent, which may be present in the bell. In order to simplify operational planning, if the working depth of the dive is known in advance, then the bell should be positioned at the Equivalent Air Depth of the dive. However, 3 situations may exist during the bell EAD diving:The bell depth may be SHALLOWER than the EAD of the dive The bell depth may be DEEPER than the EAD of the dive The bell depth may be EQUAL to the EAD of the dive In all 3 situations, the deepest depth taking into account the bell and lockout divers depth must be used for decompression purposes. In the event the diver breathes AIR during his downward excursion dive from the bell, then decompression is to be carried out as though the diver had breathed AIR throughout the entire dive, ie. if the diver is working at 50 fsw breathing a 40% O2 mixture with a corresponding EAD of 30 fsw, and for any period of time during the dive breathes AIR, then he will be decompressed as if he had dived to 50 fsw breathing AIR.
G:\Qa\Diving\Dpr99484
19/6/09
15 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
12.0
Revision: 0
EAD CALCULATION 40%O2/60%N2
The following tables are used to derive the Equivalent Air Depth of a dive based on a 40% oxygen percent in the divers breathing gas, with allowances of + 8% for mismixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent, the point of intersection will indicate the divers Equivalent Air Depth, this depth is then used for planning the dive, and for subsequent decompression purposes. In table 1A, ** denotes that the PPO2 exceeds 1.4 ATA, and is not to be used for operational diving. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross-referencing Table 1A, the resulting Equivalent Air Depth is found to be 37 fsw.
G:\Qa\Diving\Dpr99484
19/6/09
16 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1A EQUIVALENT AIR DEPTH
DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
20
12
11
9
8
7
22
14
12
11
10
24
16
14
13
26
17
16
28
19
30
44
46
48
5
4
3
1
8
7
5
4
3
11
10
8
7
5
4
14
13
11
10
8
7
5
17
16
14
13
11
10
8
7
21
19
18
16
14
13
11
10
8
32
22
21
19
18
16
14
13
11
9
34
24
22
21
19
17
16
14
12
11
36
26
24
22
21
19
17
15
14
12
38
28
26
24
22
20
19
17
15
13
40
29
27
26
24
22
20
18
16
15
42
31
29
27
25
23
22
20
18
16
44
33
31
29
27
25
23
21
19
17
46
35
33
31
29
27
25
23
21
19
48
36
34
32
30
28
26
24
22
20
50
38
36
34
32
30
27
25
23
21
52
40
38
35
33
31
29
27
25
22
54
41
39
37
35
33
30
28
26
24
G:\Qa\Diving\Dpr99484
19/6/09
17 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1A EQUIVALENT AIR DEPTH
DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
56
43
41
39
36
34
58
45
43
40
38
60
47
44
42
62
48
46
64
50
66
44
46
48
32
30
27
25
36
33
31
29
26
39
37
35
32
30
28
43
41
39
36
34
31
29
48
45
43
40
38
35
33
**
52
49
47
44
42
39
37
34
**
68
53
51
48
46
43
41
38
**
**
70
55
53
50
47
45
42
40
**
**
72
57
54
52
49
46
44
41
**
**
74
59
56
53
50
48
45
**
**
**
76
60
58
55
52
49
47
**
**
**
78
62
59
56
54
51
**
**
**
**
80
64
61
58
55
52
**
**
**
**
82
65
63
60
57
54
**
**
**
**
84
67
64
61
58
**
**
**
**
**
86
69
66
63
60
**
**
**
**
**
88
71
68
65
61
**
**
**
**
**
90
72
69
66
**
**
**
**
**
**
G:\Qa\Diving\Dpr99484
19/6/09
18 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
13.0
Revision: 0
PPO2 CALCULATION FOR 40%O2/60%N2
The following table identified as Table 1B, is used to derive the partial Pressure of Oxygen in the divers breathing gas, with allowances of + 8% for mis-mixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers partial Pressure of Oxygen, the resulting partial pressure of Oxygen is used to determine maximum bottom time. In Table 1B, figures to the right of the stepped line indicate those PPO2’s that exceed 1.4 ATA. EXAMPLE A dive is to be conducted to 60 fsw breathing a mixture containing 40% oxygen, by cross referencing Table 1B, the resulting Partial Pressure of Oxygen is found to be 1.12 ATA.
G:\Qa\Diving\Dpr99484
19/6/09
19 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1B PARTIAL PRESSURE OF OXYGEN DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
20
0.51
0.54
0.57
0.61
0.64
22
0.53
0.56
0.60
0.63
24
0.55
0.58
0.62
26
0.57
0.60
28
0.59
30
44
46
48
0.67
0.70
0.73
0.77
0.66
0.70
0.73
0.76
0.80
0.65
0.69
0.72
0.76
0.79
0.82
0.64
0.67
0.71
0.75
0.78
0.82
0.85
0.62
0.66
0.70
0.73
0.77
0.81
0.85
0.88
0.61
0.64
0.68
0.72
0.76
0.80
0.84
0.87
0.91
32
0.63
0.66
0.70
0.74
0.78
0.82
0.86
0.90
0.94
34
0.64
0.69
0.73
0.77
0.81
0.85
0.89
0.93
0.97
36
0.66
0.71
0.75
0.79
0.83
0.87
0.92
0.96
1.00
38
0.68
0.73
0.77
0.81
0.86
0.90
0.94
0.98
1.03
40
0.70
0.75
0.79
0.84
0.88
0.92
0.97
1.01
1.06
42
0.72
0.77
0.81
0.86
0.90
0.95
0.99
1.04
1.09
44
0.74
0.79
0.83
0.88
0.93
0.97
1.02
1.07
1.12
46
0.76
0.81
0.86
0.90
0.95
1.00
1.05
1.10
1.14
48
0.78
0.83
0.88
0.93
0.98
1.03
1.09
1.12
1.17
50
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
1.20
52
0.82
0.87
0.92
0.97
1.03
1.08
1.13
1.18
1.23
54
0.84
0.89
0.94
1.00
1.05
1.10
1.16
1.21
1.26
G:\Qa\Diving\Dpr99484
19/6/09
20 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 1B PARTIAL PRESSURE OF OXYGEN DEPTH FSW
32
34
36
OXYGEN PERCENT 38 40 42
56
0.86
0.91
0.97
1.02
1.07
58
0.88
0.93
0.99
1.04
60
0.90
0.95
1.01
62
0.92
0.97
64
0.94
66
44
46
48
1.13
1.18
1.24
1.29
1.10
1.15
1.21
1.26
1.32
1.07
1.12
1.18
1.24
1.29
1.35
1.03
1.09
1.15
1.20
1.26
1.32
1.38
0.99
1.05
1.11
1.17
1.23
1.29
1.35
1.41
0.96
1.02
1.08
1.14
1.20
1.26
1.32
1.38
1.44
68
0.97
1.04
1.10
1.16
1.22
1.28
1.34
1.40
1.46
70
0.99
1.06
1.12
1.18
1.24
1.31
1.37
1.43
1.49
72
1.01
1.08
1.14
1.20
1.27
1.33
1.40
1.46
1.52
74
1.03
1.10
1.16
1.23
1.29
1.36
1.42
1.49
1.55
76
1.05
1.12
1.18
1.25
1.32
1.38
1.45
1.51
1.58
78
1.07
1.14
1.21
1.27
1.34
1.41
1.48
1.54
1.61
80
1.09
1.16
1.23
1.30
1.36
1.43
1.50
1.57
1.64
82
1.11
1.18
1.25
1.32
1.39
1.46
1.53
1.60
1.67
84
1.13
1.20
1.27
1.34
1.41
1.48
1.56
1.63
1.70
86
1.15
1.22
1.29
1.37
1.44
1.51
1.58
1.65
1.73
88
1.17
1.24
1.32
1.39
1.46
1.54
1.61
1.68
1.76
90
1.19
1.26
1.34
1.41
1.49
1.56
1.64
1.71
1.78
G:\Qa\Diving\Dpr99484
19/6/09
21 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
14.0
Revision: 0
CALCULATION SHEETS FOR MIXING 40%O2/60%N2
The following tables are used to derive the amount of Oxygen and Air to add to a pack of gas containing a pre-mixed gas, and to re-mix it back up to a pre-determined final working pressure. The gas mixing tables are divided into 3 columns, headed GAS, OXY, AIR, and have the following meanings:GAS
Initial gas pressure of pack
OXY
Final pressure after CASCADING correct amount of oxygen into the pack.
AIR
Final pressure to pump pack up to with AIR to derive correct mixture.
EXAMPLE A gas pack containing 1140 psi of 40%O2/60%N2 requires to be made up to its working pressure of 2200 psi whilst retaining the original gas mixture. Step 1
G:\Qa\Diving\Dpr99484
Locate 1140 psi under the column headed GAS Step 2
To the right under the column headed OXY identify 1395 psi. This is the final pressure after CASCADING the correct amount of Oxygen.
Step 3
To the right of 1395 under the column headed AIR identify 2200 psi, this is final pressure of the pack after adding the correct amount of air.
19/6/09
22 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 BACK TO 40%O2/60%N2 AT
2600 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
641 656 671 686 701 716 732 747 762 777 792 808 823 838 853 868 884 899 914 929 944 959 975 990 1005
G:\Qa\Diving\Dpr99484
AIR GAS 2600 520 2600 540 2600 560 2600 580 2600 600 2600 620 2600 640 2600 660 2600 680 2600 700 2600 720 2600 740 2600 760 2600 780 2600 800 2600 820 2600 840 2600 860 2600 880 2600 900 2600 920 2600 940 2600 960 2600 980 2600 1000
OXY
AIR GAS
OXY
1020 1035 1051 1066 1081 1096 1111 1127 1142 1157 1172 1187 1203 1218 1233 1248 1263 1278 1294 1309 1324 1339 1354 1370 1385
2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
1400 1415 1430 1446 1461 1476 1491 1506 1522 1537 1552 1567 1582 1597 1613 1628 1643 1658 1673 1689 1704 1719 1734 1749 1765
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
AIR GAS 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1780 1795 1810 1825 1841 1856 1871 1886 1901 1916 1932 1947 1962 1977 1992 2008 2023 2038 2053 2068 2084 2099 2114 2129 2144
AIR 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
23 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 BACK TO 40%O2/60%N2 AT
2400 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
592 608 623 638 653 668 684 699 714 729 744 759 775 790 805 820 835 851 866 881 896 911 927 942 957
G:\Qa\Diving\Dpr99484
AIR GAS 2400 520 2400 540 2400 560 2400 580 2400 600 2400 620 2400 640 2400 660 2400 680 2400 700 2400 720 2400 740 2400 760 2400 780 2400 800 2400 820 2400 840 2400 860 2400 880 2400 900 2400 920 2400 940 2400 960 2400 980 2400 1000
OXY 972 987 1003 1018 1033 1048 1063 1078 1094 1109 1124 1139 1154 1170 1185 1200 1215 1230 1246 1261 1276 1291 1306 1322 1337
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1352 1367 1382 1397 1413 1428 1443 1458 1473 1489 1504 1519 1534 1549 1565 1580 1595 1610 1625 1641 1656 1671 1686 1701 1716
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1732 1747 1762 1777 1792 1808 1823 1838 1853 1868 1884 1899 1914 1929 1944 1959 1975 1990 2005 2020 2035 2051 2066 2081 2096
AIR 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
24 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 40%O2/60%N2 BACK TO 40%O2/60%N2 AT
2200 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
544 559 575 590 605 620 635 651 666 681 696 711 727 742 757 772 787 803 818 833 848 863 878 894 909
G:\Qa\Diving\Dpr99484
AIR GAS 2200 520 2200 540 2200 560 2200 580 2200 600 2200 620 2200 640 2200 660 2200 680 2200 700 2200 720 2200 740 2200 760 2200 780 2200 800 2200 820 2200 840 2200 860 2200 880 2200 900 2200 920 2200 940 2200 960 2200 980 2200 1000
OXY 924 939 954 970 985 1000 1015 1030 1046 1061 1076 1091 1106 1122 1137 1152 1167 1182 1197 1213 1228 1243 1258 1273 1289
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1304 1319 1334 1349 1365 1380 1395 1410 1425 1441 1456 1471 1486 1501 1516 1532 1547 1562 1577 1592 1608 1623 1638 1653 1668
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1684 1699 1714 1729 1744 1759 1775 1790 1805 1820 1835 1851 1866 1881 1896 1911 1927 1942 1957 1972 1987 2003 2018 2033 2048
AIR 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
25 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
15.0
Revision: 0
EAD CALCULATION FOR 32%O2/68%N2 The following tables are used to derive the Equivalent Air Depth of a dive based on a 32% oxygen percent in the divers breathing gas, with allowances of + 8% for mismixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent and the point of intersection will indicate the divers Equivalent Air Depth, this depth is then used for planning the dive, and for subsequent decompression purposes. In the table ** denotes that the PPO2 exceeds 1.4 ATA, and is not to be used for operational diving. EXAMPLE A dive is to be conducted to 94 fsw breathing a mixture containing 32% oxygen, by cross-referencing Table 2A, the resulting Equivalent Air Depth is found to be 76 fsw.
G:\Qa\Diving\Dpr99484
19/6/09
26 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 2A EQUIVALENT AIR DEPTH DEPTH FSW
OXYGEN PERCENT 30 32 34
24
26
28
20
17
16
15
13
12
22
19
18
17
15
24
21
20
18
26
23
22
28
25
30
36
38
40
11
9
8
7
14
12
11
10
8
17
16
14
13
11
10
20
19
17
16
14
13
11
24
22
21
19
17
16
14
13
27
26
24
22
21
19
18
16
14
32
29
27
26
24
22
21
19
18
16
34
31
29
28
26
24
22
21
19
17
36
33
31
29
28
26
24
22
21
19
38
35
33
31
29
28
26
24
22
20
40
37
35
33
31
29
27
26
24
22
42
39
37
35
33
31
29
27
25
23
44
41
39
37
35
33
31
29
27
25
46
43
41
39
37
35
33
31
29
27
48
44
42
40
38
36
34
32
30
28
50
46
44
42
40
38
36
34
32
30
52
48
46
44
42
40
38
35
33
31
54
50
48
46
44
41
39
37
35
33
TABLE 2A G:\Qa\Diving\Dpr99484
19/6/09
27 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
EQUIVALENT AIR DEPTH DEPTH FSW
OXYGEN PERCENT 30 32 34
24
26
28
56
52
50
48
45
43
58
54
52
49
47
60
56
54
51
62
58
55
64
60
66
36
38
40
41
39
36
34
45
43
40
38
36
49
47
44
42
39
37
53
51
48
46
43
41
39
57
55
52
50
48
45
43
40
62
59
57
54
52
49
47
44
42
68
64
61
59
56
53
51
48
46
43
70
66
63
60
58
55
53
50
47
45
72
68
65
62
60
57
54
52
49
46
74
69
67
64
61
59
56
53
50
48
76
71
69
66
63
60
58
55
52
49
78
73
70
68
65
62
59
56
54
51
80
75
72
69
67
64
61
58
55
52
82
77
74
71
68
65
63
60
57
54
84
79
76
73
70
67
64
61
58
**
86
81
78
75
72
69
66
63
60
**
88
83
80
77
74
71
68
65
61
**
90
85
82
79
75
72
69
66
**
**
TABLE 2A EQUIVALENT AIR DEPTH G:\Qa\Diving\Dpr99484
19/6/09
28 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
DEPTH FSW
24
26
28
OXYGEN PERCENT 30 32 34
92
87
84
80
77
74
94
89
85
82
79
96
91
87
84
98
93
89
100
94
102
36
38
40
71
68
**
**
76
73
69
**
**
81
78
74
71
**
**
86
83
79
76
**
**
**
91
88
84
81
78
**
**
**
96
93
90
86
83
79
**
**
**
104
98
95
91
88
84
**
**
**
**
106
100
97
93
90
86
**
**
**
**
108
102
99
95
91
88
**
**
**
**
110
104
100
97
93
90
**
**
**
**
112
106
102
99
95
91
**
**
**
**
114
108
104
100
97
**
**
**
**
**
116
110
106
102
99
**
**
**
**
**
118
112
108
104
100
**
**
**
**
**
120
114
110
106
102
**
**
**
**
**
G:\Qa\Diving\Dpr99484
19/6/09
29 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
16.0
Revision: 0
PPO2 CALCULATION FOR 32%O2/68%N2
The following table identified as table 2B, is used to derive the Partial Pressure of Oxygen in the divers breathing gas, with allowances of + 8% for mis-mixing. To use these tables, locate the actual depth of the diver down the left hand column, headed DEPTH FSW, and across the top under the heading OXYGEN PERCENT, locate the oxygen percent in the divers breathing gas. Follow the table horizontally across from the divers depth, and vertically down from his oxygen percent, and the point of intersection will indicate the Partial Pressure of Oxygen, the resulting Partial Pressure of Oxygen is used to determine maximum bottom time. In the table figures to the right of the stepped line indicate those PPO2’s that exceed 1.4 ATA. EXAMPLE A dive is to be conducted to 94 fsw breathing a mixture containing 32% oxygen, by cross-referencing Table 2B, the resulting Partial Pressure of Oxygen is found to be 1.23.
G:\Qa\Diving\Dpr99484
19/6/09
30 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
TABLE 2B PARTIAL PRESSURE OF OXYGEN DEPTH FSW
24
26
28
OXYGEN PERCENT 30 32 34
20
0.38
0.41
0.44
0.48
0.51
22
0.40
0.43
0.46
0.50
24
0.41
0.44
0.48
26
0.42
0.46
28
0.44
30
36
38
40
0.54
0.57
0.61
0.64
0.53
0.56
0.60
0.63
0.66
0.51
0.55
0.58
0.62
0.65
0.69
0.50
0.53
0.57
0.60
0.64
0.67
0.71
0.48
0.51
0.55
0.59
0.62
0.66
0.70
0.73
0.45
0.49
0.53
0.57
0.61
0.64
0.68
0.72
0.76
32
0.47
0.51
0.55
0.59
0.63
0.66
0.70
0.74
0.78
34
0.48
0.52
0.56
0.60
0.64
0.69
0.73
0.77
0.81
36
0.50
0.54
0.58
0.62
0.66
0.71
0.75
0.79
0.83
38
0.51
0.55
0.60
0.64
0.68
0.73
0.77
0.81
0.86
40
0.53
0.57
0.61
0.66
0.70
0.75
0.79
0.84
0.88
42
0.54
0.59
0.63
0.68
0.72
0.77
0.81
0.86
0.90
44
0.55
0.60
0.65
0.69
0.74
0.79
0.83
0.88
0.93
46
0.57
0.62
0.67
0.71
0.76
0.81
0.86
0.90
0.95
48
0.58
0.63
0.68
0.73
0.78
0.83
0.88
0.93
0.98
50
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
52
0.61
0.66
0.72
0.77
0.82
0.87
0.92
0.97
1.03
54
0.63
0.68
0.73
0.79
0.84
0.89
0.94
1.00
1.05
TABLE 2B G:\Qa\Diving\Dpr99484
19/6/09
31 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
PARTIAL PRESSURE OF OXYGEN DEPTH FSW
OXYGEN PERCENT 30 32 34
24
26
28
56
0.64
0.70
0.75
0.80
0.86
58
0.66
0.71
0.77
0.82
60
0.67
0.73
0.78
62
0.69
0.74
64
0.70
66
36
38
40
0.91
0.97
1.02
1.07
0.88
0.93
0.99
1.04
1.10
0.84
0.90
0.95
1.01
1.07
1.12
0.80
0.86
0.92
0.97
1.03
1.09
1.15
0.76
0.82
0.88
0.94
0.99
1.05
1.11
1.17
0.72
0.78
0.84
0.90
0.96
1.02
1.08
1.14
1.20
68
0.73
0.79
0.85
0.91
0.97
1.04
1.10
1.16
1.22
70
0.74
0.81
0.87
0.93
0.99
1.06
1.12
1.18
1.24
72
0.76
0.82
0.89
0.95
1.01
1.08
1.14
1.20
1.27
74
0.77
0.84
0.90
0.97
1.03
1.10
1.16
1.23
1.29
76
0.79
0.85
0.92
0.99
1.05
1.12
1.18
1.25
1.32
78
0.80
0.87
0.94
1.00
1.07
1.14
1.21
1.27
1.34
80
0.82
0.89
0.95
1.02
1.09
1.16
1.23
1.30
1.36
82
0.83
0.90
0.97
1.04
1.11
1.18
1.25
1.32
1.39
84
0.85
0.92
0.99
1.06
1.13
1.20
1.27
1.34
1.41
86
0.86
0.93
1.00
1.08
1.15
1.22
1.29
1.37
1.44
88
0.89
0.95
1.02
1.10
1.17
1.24
1.32
1.39
1.46
90
0.89
0.96
1.04
1.11
1.19
1.26
1.34
1.41
1.49
TABLE 2B PARTIAL PRESSURE OF OXYGEN G:\Qa\Diving\Dpr99484
19/6/09
32 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
17.0
DEPTH FSW
24
26
28
92
0.90
0.98
1.06
1.13
1.21
94
0.92
1.00
1.07
1.15
96
0.93
1.01
1.09
98
0.95
1.03
100
0.96
102
Revision: 0
OXYGEN PERCENT 30 32 34
36
38
40
1.28
1.36
1.43
1.51
1.23
1.30
1.38
1.46
1.53
1.17
1.25
1.32
1.40
1.48
1.56
1.11
1.19
1.27
1.34
1.42
1.50
1.58
1.04
1.12
1.20
1.28
1.37
1.45
1.53
1.61
0.98
1.06
1.14
1.22
1.30
1.39
1.47
1.55
1.63
104
0.99
1.07
1.16
1.24
1.32
1.41
1.49
1.57
1.66
106
1.01
1.09
1.17
1.26
1.34
1.43
1.51
1.60
1.68
108
1.02
1.11
1.19
1.28
1.36
1.45
1.53
1.62
1.70
110
1.04
1.12
1.21
1.30
1.38
1.47
1.56
1.64
1.73
112
1.05
1.14
1.23
1.31
1.40
1.49
1.58
1.66
1.75
114
1.06
1.15
1.24
1.33
1.42
1.51
1.60
1.69
1.78
116
1.08
1.17
1.26
1.35
1.44
1.53
1.62
1.71
1.80
118
1.09
1.18
1.28
1.37
1.46
1.55
1.64
1.73
1.83
120
1.11
1.20
1.29
1.39
1.48
1.57
1.66
1.76
1.85
CALCULATION SHEETS FOR MIXING 32%O2/68%N2
The following tables are used to derive the amount of Oxygen and Air to add to a pack of gas containing a pre-mixed gas, and to re-mix it back up to a pre-determined final working pressure. The gas mixing tables are divided into 3 columns, headed GAS, OXY, AIR, and have the following meanings:G:\Qa\Diving\Dpr99484
19/6/09
33 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
GAS
Revision: 0
Initial gas pressure of pack
OXY
Final pressure after CASCADING correct amount of oxygen into the pack.
AIR
Final pressure to pump pack up to with AIR to derive correct mixture.
EXAMPLE A gas pack containing 1140 psi of 32%O2/68%N2 requires to be made up to its working pressure of 2200 psi whilst retaining the original gas mixture. Step 1
G:\Qa\Diving\Dpr99484
Locate 1140 psi under the column headed GAS
Step 2
To the right under the column headed OXY identify 1288 psi. This is the final pressure after CASCADING the correct amount of Oxygen.
Step 3
To the right of 1288 under the column headed AIR identify 2200 psi, this is the final pressure of the pack after adding the correct amount of air.
19/6/09
34 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 BACK TO 32%O2/68%N2 AT
2600 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
641 656 671 686 701 716 732 747 762 777 792 808 823 838 853 868 884 899 914 929 944 959 975 990 1005
G:\Qa\Diving\Dpr99484
AIR GAS 2600 520 2600 540 2600 560 2600 580 2600 600 2600 620 2600 640 2600 660 2600 680 2600 700 2600 720 2600 740 2600 760 2600 780 2600 800 2600 820 2600 840 2600 860 2600 880 2600 900 2600 920 2600 940 2600 960 2600 980 2600 1000
OXY 1020 1035 1051 1066 1081 1096 1111 1127 1142 1157 1172 1187 1203 1218 1233 1248 1263 1278 1294 1309 1324 1339 1354 1370 1385
AIR GAS 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1400 1415 1430 1446 1461 1476 1491 1506 1522 1537 1552 1567 1582 1597 1613 1628 1643 1658 1673 1689 1704 1719 1734 1749 1765
AIR GAS 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1780 1795 1810 1825 1841 1856 1871 1886 1901 1916 1932 1947 1962 1977 1992 2008 2023 2038 2053 2068 2084 2099 2114 2129 2144
AIR 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600 2600
35 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 BACK TO 32%O2/68%N2 AT
2400 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
592 608 623 638 653 668 684 699 714 729 744 759 775 790 805 820 835 851 866 881 896 911 927 942 957
G:\Qa\Diving\Dpr99484
AIR GAS 2400 520 2400 540 2400 560 2400 580 2400 600 2400 620 2400 640 2400 660 2400 680 2400 700 2400 720 2400 740 2400 760 2400 780 2400 800 2400 820 2400 840 2400 860 2400 880 2400 900 2400 920 2400 940 2400 960 2400 980 2400 1000
OXY 972 987 1003 1018 1033 1048 1063 1078 1094 1109 1124 1139 1154 1170 1185 1200 1215 1230 1246 1261 1276 1291 1306 1322 1337
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1352 1367 1382 1397 1413 1428 1443 1458 1473 1489 1504 1519 1534 1549 1565 1580 1595 1610 1625 1641 1656 1671 1686 1701 1716
AIR GAS 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1732 1747 1762 1777 1792 1808 1823 1838 1853 1868 1884 1899 1914 1929 1944 1959 1975 1990 2005 2020 2035 2051 2066 2081 2096
AIR 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400 2400
36 of 37
EAD EQUIVALENT AIR DEPTH DIVING MANUAL
Revision: 0
CALCULATION SHEET FOR MIXING 32%O2/68%N2 BACK TO 32%O2/68%N2 AT
2200 PSI GAS
OXY
20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380 400 420 440 460 480 500
544 559 575 590 605 620 635 651 666 681 696 711 727 742 757 772 787 803 818 833 848 863 878 894 909
G:\Qa\Diving\Dpr99484
AIR GAS 2200 520 2200 540 2200 560 2200 580 2200 600 2200 620 2200 640 2200 660 2200 680 2200 700 2200 720 2200 740 2200 760 2200 780 2200 800 2200 820 2200 840 2200 860 2200 880 2200 900 2200 920 2200 940 2200 960 2200 980 2200 1000
OXY 924 939 954 970 985 1000 1015 1030 1046 1061 1076 1091 1106 1122 1137 1152 1167 1182 1197 1213 1228 1243 1258 1273 1289
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
19/6/09
1020 1040 1060 1080 1100 1120 1140 1160 1180 1200 1220 1240 1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500
OXY 1304 1319 1334 1349 1365 1380 1395 1410 1425 1441 1456 1471 1486 1501 1516 1532 1547 1562 1577 1592 1608 1623 1638 1653 1668
AIR GAS 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
1520 1540 1560 1580 1600 1620 1640 1660 1680 1700 1720 1740 1760 1780 1800 1820 1840 1860 1880 1900 1920 1940 1960 1980 2000
OXY 1684 1699 1714 1729 1744 1759 1775 1790 1805 1820 1835 1851 1866 1881 1896 1911 1927 1942 1957 1972 1987 2003 2018 2033 2048
AIR 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200 2200
37 of 37
Related Documents
Nitrox
May 2020 2