Sounds Of Equipments

Sounds of Equipments This spreadsheet provides estimations and/or default values of Sound Power and/or Sound Pressure Level for common industrial equipments (fans, compressors, pumps, turbines, etc). Sound Power Level (SWL) is defined as sound radiated from an equipment/a source which depends only on its operating parameters such as RPM, kW, etc. It does not depend on distance. While Sound Pressure Level (SPL) is defined as sound heard by a receptor from an equipment/a source at certain distance. So, SPL is correlated with SWL. At certain conditions, SPL may become noise (unwanted sound). This spreadsheet contains four sheets, started by this sheet 'Introduction' and sequentially followed by sheets 'Main Sheet', 'Data1', and at the end 'Data2'. 'Main Sheet' is where estimations of SWL and SPL are done. Default values are also provided in this sheet. Sheet 'Data 1' is for data required for estimating SWL of fans. While sheet 'Data 2' is data required for estimating SWL of casing of diesel and/or gas-driven engine and transformers. Need to remember!!!!!!! All estimated and default SPLs (not SWLs) are for uncontrolled sounds. SPLs estimated in this spreadsheet are only depended on distance (1 meter). They do not take into account control factors like barriers and other control efforts. Reference: Bies, David A. & Hansen, Colin H. 2003. “Engineering Noise Control: Theory and Practice”. 3rd Edition. Taylor & Francis Prepared by: Muhamad Nizar

Equipment

Input Data

Calculated SWL

Calculated SPL at 1 m

(dB)

(dB)

Default Value (dB) SWL

SPL at 1 m

Fans See Sheet 'Data1'

Cf Q (m3/s)

See Sheet 'Data1'

33 0.237

P (Pa)

125

E (%)

90

BFI

60

3

Compressor Air Compressor (Up to 1.5 kW)

92

Air Compressor (2-6 kW)

95

Air Compressor (7-75 kW)

98

Rotary

kW

45

107

Centrifugal (casing noise excluding air inlet noise)

kW

45

96

Centrifugal (unmuffled air inlet noise excluding casing noise)

kW

45

97

kW

70

115

kW

80

115

3000-3600 rpm (Under 75 kW)

kW

70

90

3000-3600 rpm (Above 75 kW)

kW

80

92

1600-1800 rpm (Under 75 kW)

kW

70

93

1600-1800 rpm (Above 75 kW)

kW

80

95

1000-1500 rpm (Under 75 kW)

kW

70

88

1000-1500 rpm (Above 75 kW)

kW

80

90

450-900 rpm (Under 75 kW)

kW

70

86

450-900 rpm (Above 75 kW)

kW

80

88

General purpose boiler

kW

70

102

Large power plant boiler

MW

110

115

Casing

MW

110

130

Inlet

MW

110

158

Exhaust

MW

110

153

Cooling Towers Propeller Type cooling tower (Fan power up to 75 kW) Substract 8 dB if the fan is operated 1/2 its rated speed Propeller Type cooling tower (Fan power greater than 75 kW) Substract 8 dB if the fan is operated 1/2 its rated speed Pumps

Boilers

Gas Turbines

Overall noise

159

Steam Turbines Overall noise

kW

12500

109

Equipment

Calculated SWL

Input Data

(dB)

Calculated SPL at 1 m (dB)

Default Value (dB) SPL at 1 SWL m

Diesel and/or Gas-Driven Engines Exhaust

kW (0 for engine with no turbo-charger, 6 for engine with turbo charger) Length of exhaust pipe (m)

Casing

110 0

K 10 Lex kW

110

See Sheet 'Data2'

A

0

See Sheet 'Data2'

B

0

See Sheet 'Data2'

C

0

See Sheet 'Data2'

D

0

Air inlet

kW Length of inlet ducting (m)

132

L

110

113

100

10

Overall noise

132

Furnace Burner noise Air flow

U

10

m

10

U

10

m

10

105 114

Overall noise

103 107

Electric Motors Under 40 kW

kW RPM

40 kW < W < 300 kW

kW RPM

30

72

100 50

75

100

Above 300 kW Generators MW

10

RPM

100

107

Transformers See Sheet 'Data2'

Nr

See Sheet 'Data2'

S (kVA)

50

70

100

Gears kW RPM

10

88

100

Crushers Primary Crusher

121

Secondary Crusher

129

Tertiary Crusher

127

Conveyors Open conveyor (per meter)

82

Enclosed conveyor (per meter)

71