Orifice Calc: Gas
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ORIFICE CALCULATIONS FOR COMPRESSIBLE FLOW Based on Mink, Chem. Eng Aug 25, 1980, p91
01 02 03 04 05 06 07
08 09 10 11 12 13 14 15 16
Inlet Pressure Pressure Drop Inlet Density @ P1
INPUT DATA P1 dP rho k DI
Ratio of Specific Heats Pipe Inside Diameter (Inlet) Orifice Designation OR Orifice Bore
Orifice Diameter Inlet Pressure Orifice Area Critical Pressure Ratio Flow Critical? Beta Y Flow Rate Flow Rate
d
CALCULATIONS d P1
d/DI m m
TY Nom. Size
3935.00 1775.00 13.1500 1.620 4.1250 0.0000 0.9540
psig psi lb/ft3 inch in2 inch
0.9540 3949.70 0.7148 0.4938 No 0.2313 0.8860 40.16 144570
inch psia in2 lb/sec lb/h
TAG
1
1.5
2
2.5
3
4 AREA CALCULATOR
A = Πr2
Enter d Enter r Enter A
Notes:
A= A= r= d=
0.000 0.000 0.000 0.000
5
1)
You may enter a standard Relief Valve Orifice Designation on Line 6 OR you may enter an actual orifice bore on Line 7. In order for the Bore size to be used in the calculation, the Orifice Designation field must be blank.
2)
Watch for the error indication on Beta. Beta cannot be greater than 1.
3)
Inlet density rho is at inlet conditions.
TYPICAL PIPE DIMENSIONS Sch.
OD
40 80 160
1.315
XXS 40 80 160
1.900
XXS 40 80 160
2.375
XXS 40 80 160
2.875
XXS 40 80 160
3.500
XXS 40 80 160
4.500
XXS 40 80 160 XXS
5.556
ID
1.049 0.957 0.815 0.599 1.610 1.500 1.338 1.100 2.067 1.939 1.689 1.503 2.469 2.323 2.125 1.771 3.068 2.900 2.626 2.300 4.026 3.826 3.438 3.152 5.047 4.813 4.313 4.063
Nom. Size
Sch.
Lookup Table OD
40
6
80 160
6.625
XXS 40
8
80 120
8.625
160 40
10
80 120
10.750
160 40
12
80 120
12.750
160 40
14
80 120
14.000
160 40 XS
16
80 120
16.000
160 40
18
80 120 160
18.000
ID
Desig.
6.065 5.761 5.189 4.897 7.981 7.625 7.189 6.813 10.020 9.564 9.064 8.500 11.938 11.376 10.750 10.126 13.126 12.500 11.814 11.188 15.000 14.314 13.564 12.814 16.876 16.126 15.250 14.438
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Area
Dia.
0.110 0.196 0.307 0.503 0.785
0.374 0.500 0.625 0.800 1.000
1.287 1.838 2.853 3.600 4.340
1.280 1.530 1.906 2.141 2.351
6.380 11.050 16.000
2.850 3.751 4.514
26.000
5.754
01 02 03 04 05 06 07
08 09 10 11 12 13 14 15 16
Inlet Pressure Pressure Drop Inlet Density @ P1
INPUT DATA P1 dP rho k DI
Ratio of Specific Heats Pipe Inside Diameter (Inlet) Orifice Designation OR Orifice Bore
Orifice Diameter Inlet Pressure Orifice Area Critical Pressure Ratio Flow Critical? Beta Y Flow Rate Flow Rate
d
CALCULATIONS d P1
d/DI m m
TY Nom. Size
3935.00 1775.00 13.1500 1.620 4.1250 0.0000 0.9540
psig psi lb/ft3 inch in2 inch
0.9540 3949.70 0.7148 0.4938 No 0.2313 0.8860 40.16 144570
inch psia in2 lb/sec lb/h
TAG
1
1.5
2
2.5
3
4 AREA CALCULATOR
A = Πr2
Enter d Enter r Enter A
Notes:
A= A= r= d=
0.000 0.000 0.000 0.000
5
1)
You may enter a standard Relief Valve Orifice Designation on Line 6 OR you may enter an actual orifice bore on Line 7. In order for the Bore size to be used in the calculation, the Orifice Designation field must be blank.
2)
Watch for the error indication on Beta. Beta cannot be greater than 1.
3)
Inlet density rho is at inlet conditions.
TYPICAL PIPE DIMENSIONS Sch.
OD
40 80 160
1.315
XXS 40 80 160
1.900
XXS 40 80 160
2.375
XXS 40 80 160
2.875
XXS 40 80 160
3.500
XXS 40 80 160
4.500
XXS 40 80 160 XXS
5.556
ID
1.049 0.957 0.815 0.599 1.610 1.500 1.338 1.100 2.067 1.939 1.689 1.503 2.469 2.323 2.125 1.771 3.068 2.900 2.626 2.300 4.026 3.826 3.438 3.152 5.047 4.813 4.313 4.063
Nom. Size
Sch.
Lookup Table OD
40
6
80 160
6.625
XXS 40
8
80 120
8.625
160 40
10
80 120
10.750
160 40
12
80 120
12.750
160 40
14
80 120
14.000
160 40 XS
16
80 120
16.000
160 40
18
80 120 160
18.000
ID
Desig.
6.065 5.761 5.189 4.897 7.981 7.625 7.189 6.813 10.020 9.564 9.064 8.500 11.938 11.376 10.750 10.126 13.126 12.500 11.814 11.188 15.000 14.314 13.564 12.814 16.876 16.126 15.250 14.438
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Area
Dia.
0.110 0.196 0.307 0.503 0.785
0.374 0.500 0.625 0.800 1.000
1.287 1.838 2.853 3.600 4.340
1.280 1.530 1.906 2.141 2.351
6.380 11.050 16.000
2.850 3.751 4.514
26.000
5.754
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