Noise levels calculation due to future fixed noise sources  for NSR 15c (21/F) - Unmitigated

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Step 1: Inventory of Noise sources

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference No.

Equipment

No. of units

SWL,dB(A)

Reverberant Effect

Corrected SWL,dB(A)

 

F1

Seawater Cooling Chiller

2

106

 

106

 

F2

Extraction Fan

6

78

 

78

 

F3

RCP Mechanical Ventilation (At the roof floor of RCP)

2

101

 

101

 

F4

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

10

101

 

101

 

F5

Emergency Generator Set

1

116

 

116

 

F6

Material Hoist

5

87

 

87

 

F7

Icing Machine

2

96

P

102

 

F8

Lorries parking

40

84

P

90

 

F10

Sampans Idling

2

102

 

102

 

F11

Fish vessels Idling

9

102

 

102

 

F12

Unloading of fish containers from sea vessels

4

93

 

93

 

F13

Auction and Marshalling

4

94

P

100

 

F14

Weighting Operation

4

99

P

105

 

F15

Loading of fish containers to lorries

4

84

P

90

 

Notes:

1. For those noise sources located within the Wholesale Fish Market Hall which is an enclosed space with an opening to the sea-side, a correction factor of +6 dB(A) is incorporated to account for the reverberant effect inside the WFM as a conservative assumption. For the sound pressure level inside a room due to fixed plant operation can be expressed as SPL=SWL+10log(Q/4pr^2+4/R) dB, where the term 10log4/R represents the reverberant sound field in a room. In a worst-scenario point of view, the term R would become unity and 10log4 equals 6. Therefore, without knowing the interior finishes of the room, we have assumed a +6 dB(A) correction for reverberant effect.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Step 2: Calculation of the distance correction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Kh = (20 log R) + 8

(Equation 2, reference from BS5228 equation D.3)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

where:

 

 

 

 

 

 

 

 

Kh

Distance adjustment, dB(A)

 

 

 

 

 

 

 

R

Slant distance between the sound source and the receiver, m

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference No.

Source

SWL

R

Kh

Leq (30 min), dB(A)

 

 

F1-1

Seawater Cooling Chiller

106

124

49.9

56.1

 

 

F1-2

Seawater Cooling Chiller

106

121

49.7

56.3

 

 

F2-1

Extraction Fan

78

153

51.7

26.3

 

 

F2-2

Extraction Fan

78

157

51.9

26.1

 

 

F2-3

Extraction Fan

78

179

53.1

24.9

 

 

F2-4

Extraction Fan

78

173

52.8

25.2

 

 

F2-5

Extraction Fan

78

167

52.5

25.5

 

 

F2-6

Extraction Fan

78

162

52.2

25.8

 

 

F3-1

RCP Mechanical Ventilation (At the roof floor of RCP)

101

128

50.1

50.7

 

 

F3-2

RCP Mechanical Ventilation (At the roof floor of RCP)

101

152

51.6

49.2

 

 

F4-1

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

204

54.2

46.6

 

 

F4-2

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

201

54.0

46.8

 

 

F4-3

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

194

53.7

47.1

 

 

F4-4

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

191

53.6

47.2

 

 

F4-5

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

189

53.5

47.3

 

 

F4-6

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

182

53.2

47.6

 

 

F4-7

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

179

53.1

47.7

 

 

F4-8

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

176

52.9

47.9

 

 

F4-9

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

171

52.7

48.1

 

 

F4-10

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

101

170

52.6

48.2

 

 

F6-1

Material Hoist

87

210

54.4

32.5

 

 

F6-2

Material Hoist

87

199

54.0

32.9

 

 

F6-3

Material Hoist

87

187

53.4

33.5

 

 

F6-4

Material Hoist

87

175

52.9

34.0

 

 

F6-5

Material Hoist

87

169

52.5

34.4

 

 

F7-1

Icing Machine

102

152

51.7

50.3

 

 

F7-2

Icing Machine

102

148

51.4

50.6

 

 

F8-1

Lorries parking

90

177

52.9

37.1

 

 

F8-2

Lorries parking

90

174

52.8

37.2

 

 

F8-3

Lorries parking

90

170

52.6

37.4

 

 

F8-4

Lorries parking

90

168

52.5

37.5

 

 

F8-5

Lorries parking

90

164

52.3

37.7

 

 

F8-6

Lorries parking

90

161

52.2

37.8

 

 

F8-7

Lorries parking

90

159

52.0

38.0

 

 

F8-8

Lorries parking

90

159

52.0

38.0

 

 

F8-9

Lorries parking

90

156

51.9

38.1

 

 

F8-10

Lorries parking

90

154

51.7

38.3

 

 

F8-11

Lorries parking

90

151

51.6

38.4

 

 

F8-12

Lorries parking

90

148

51.4

38.6

 

 

F8-13

Lorries parking

90

145

51.2

38.8

 

 

F8-14

Lorries parking

90

144

51.1

38.9

 

 

F8-15

Lorries parking

90

141

51.0

39.0

 

 

F8-16

Lorries parking

90

139

50.9

39.1

 

 

F8-17

Lorries parking

90

138

50.8

39.2

 

 

F8-18

Lorries parking

90

137

50.7

39.3

 

 

F8-19

Lorries parking

90

135

50.6

39.4

 

 

F8-20

Lorries parking

90

133

50.5

39.5

 

 

F8-21

Lorries parking

90

182

53.2

36.8

 

 

F8-22

Lorries parking

90

181

53.2

36.8

 

 

F8-23

Lorries parking

90

178

53.0

37.0

 

 

F8-24

Lorries parking

90

175

52.9

37.1

 

 

F8-25

Lorries parking

90

173

52.8

37.2

 

 

F8-26

Lorries parking

90

171

52.7

37.3

 

 

F8-27

Lorries parking

90

166

52.4

37.6

 

 

F8-28

Lorries parking

90

164

52.3

37.7

 

 

F8-29

Lorries parking

90

165

52.3

37.7

 

 

F8-30

Lorries parking

90

161

52.1

37.9

 

 

F8-31

Lorries parking

90

158

52.0

38.0

 

 

F8-32

Lorries parking

90

155

51.8

38.2

 

 

F8-33

Lorries parking

90

153

51.7

38.3

 

 

F8-34

Lorries parking

90

150

51.5

38.5

 

 

F8-35

Lorries parking

90

147

51.4

38.6

 

 

F8-36

Lorries parking

90

144

51.2

38.8

 

 

F8-37

Lorries parking

90

142

51.0

39.0

 

 

F8-38

Lorries parking

90

141

51.0

39.0

 

 

F8-39

Lorries parking

90

141

51.0

39.0

 

 

F8-40

Lorries parking

90

139

50.9

39.1

 

 

F10-1

Sampans Idling

102

195

53.8

48.0

 

 

F10-2

Sampans Idling

102

192

53.7

48.1

 

 

F11-1

Fish vessels Idling

102

208

54.3

47.5

 

 

F11-2

Fish vessels Idling

102

204

54.2

47.6

 

 

F11-3

Fish vessels Idling

102

199

54.0

47.8

 

 

F11-4

Fish vessels Idling

102

189

53.5

48.3

 

 

F11-5

Fish vessels Idling

102

186

53.4

48.4

 

 

F11-6

Fish vessels Idling

102

214

54.6

47.2

 

 

F11-7

Fish vessels Idling

102

209

54.4

47.4

 

 

F11-8

Fish vessels Idling

102

201

54.1

47.7

 

 

F11-9

Fish vessels Idling

102

184

53.3

48.5

 

 

F12-1

Unloading of fish containers from sea vessels

93

207

54.3

38.7

 

 

F12-2

Unloading of fish containers from sea vessels

93

194

53.8

39.2

 

 

F12-3

Unloading of fish containers from sea vessels

93

182

53.2

39.8

 

 

F12-4

Unloading of fish containers from sea vessels

93

170

52.6

40.4

 

 

F13-1

Auction and Marshalling

100

183

53.3

46.7

 

 

F13-2

Auction and Marshalling

100

172

52.7

47.3

 

 

F13-3

Auction and Marshalling

100

162

52.2

47.8

 

 

F13-4

Auction and Marshalling

100

153

51.7

48.3

 

 

F14-1

Weighting Operation

105

190

53.6

51.4

 

 

F14-2

Weighting Operation

105

180

53.1

51.9

 

 

F14-3

Weighting Operation

105

170

52.6

52.4

 

 

F14-4

Weighting Operation

105

161

52.1

52.9

 

 

F15-1

Loading of fish containers to lorries

90

182

53.2

36.8

 

 

F15-2

Loading of fish containers to lorries

90

174

52.8

37.2

 

 

F15-3

Loading of fish containers to lorries

90

166

52.4

37.6

 

 

F15-4

Loading of fish containers to lorries

90

158

52.0

38.0

 

 

 

 

 

 

 

 

 

 

 

Step 3: Make allowances for reflections and screening

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The barrier screening effect was obtained from BS5228 barrier attenuation

 

 

 

 

 

 

 

 

 

Reference No.

Source

 Leq (30 min)

Façade Effect

Barrier Effect

Corrected Leq (30 min), dB(A)

F1-1

Seawater Cooling Chiller

56.1

3

0

59

F1-2

Seawater Cooling Chiller

56.3

3

0

59

F2-1

Extraction Fan

26.3

3

0

29

F2-2

Extraction Fan

26.1

3

0

29

F2-3

Extraction Fan

24.9

3

0

28

F2-4

Extraction Fan

25.2

3

0

28

F2-5

Extraction Fan

25.5

3

0

29

F2-6

Extraction Fan

25.8

3

0

29

F3-1

RCP Mechanical Ventilation (At the roof floor of RCP)

50.7

3

0

54

F3-2

RCP Mechanical Ventilation (At the roof floor of RCP)

49.2

3

0

52

F4-1

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

46.6

3

-20

30

F4-2

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

46.8

3

-19

31

F4-3

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

47.1

3

-21

29

F4-4

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

47.2

3

-20

30

F4-5

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

47.3

3

-19

31

F4-6

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

47.6

3

-21

30

F4-7

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

47.7

3

-20

31

F4-8

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

47.9

3

-19

31

F4-9

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

48.1

3

-20

31

F4-10

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

48.2

3

-23

29

F6-1

Material Hoist

32.5

3

-24

11

F6-2

Material Hoist

32.9

3

-24

12

F6-3

Material Hoist

33.5

3

-24

12

F6-4

Material Hoist

34.0

3

-24

13

F6-5

Material Hoist

34.4

3

-24

13

F7-1

Icing Machine

50.3

3

-24

29

F7-2

Icing Machine

50.6

3

-24

29

F8-1

Lorries parking

37.1

3

-24

16

F8-2

Lorries parking

37.2

3

-24

16

F8-3

Lorries parking

37.4

3

-24

16

F8-4

Lorries parking

37.5

3

-24

16

F8-5

Lorries parking

37.7

3

-24

16

F8-6

Lorries parking

37.8

3

-24

17

F8-7

Lorries parking

38.0

3

-24

17

F8-8

Lorries parking

38.0

3

-24

17

F8-9

Lorries parking

38.1

3

-24

17

F8-10

Lorries parking

38.3

3

-24

17

F8-11

Lorries parking

38.4

3

-24

17

F8-12

Lorries parking

38.6

3

-24

17

F8-13

Lorries parking

38.8

3

-24

17

F8-14

Lorries parking

38.9

3

-24

18

F8-15

Lorries parking

39.0

3

-24

18

F8-16

Lorries parking

39.1

3

-24

18

F8-17

Lorries parking

39.2

3

-24

18

F8-18

Lorries parking

39.3

3

-24

18

F8-19

Lorries parking

39.4

3

-24

18

F8-20

Lorries parking

39.5

3

-24

18

F8-21

Lorries parking

36.8

3

-24

16

F8-22

Lorries parking

36.8

3

-24

16

F8-23

Lorries parking

37.0

3

-24

16

F8-24

Lorries parking

37.1

3

-24

16

F8-25

Lorries parking

37.2

3

-24

16

F8-26

Lorries parking

37.3

3

-24

16

F8-27

Lorries parking

37.6

3

-24

16

F8-28

Lorries parking

37.7

3

-24

16

F8-29

Lorries parking

37.7

3

-24

16

F8-30

Lorries parking

37.9

3

-24

17

F8-31

Lorries parking

38.0

3

-24

17

F8-32

Lorries parking

38.2

3

-24

17

F8-33

Lorries parking

38.3

3

-24

17

F8-34

Lorries parking

38.5

3

-24

17

F8-35

Lorries parking

38.6

3

-24

17

F8-36

Lorries parking

38.8

3

-24

18

F8-37

Lorries parking

39.0

3

-24

18

F8-38

Lorries parking

39.0

3

-24

18

F8-39

Lorries parking

39.0

3

-24

18

F8-40

Lorries parking

39.1

3

-24

18

F10-1

Sampans Idling

48.0

3

-23

28

F10-2

Sampans Idling

48.1

3

-23

28

F11-1

Fish vessels Idling

47.5

3

-23

28

F11-2

Fish vessels Idling

47.6

3

-22

29

F11-3

Fish vessels Idling

47.8

3

-22

29

F11-4

Fish vessels Idling

48.3

3

-23

28

F11-5

Fish vessels Idling

48.4

3

-24

28

F11-6

Fish vessels Idling

47.2

3

-24

26

F11-7

Fish vessels Idling

47.4

3

-24

26

F11-8

Fish vessels Idling

47.7

3

-23

28

F11-9

Fish vessels Idling

48.5

3

-23

28

F12-1

Unloading of fish containers from sea vessels

38.7

3

-24

17

F12-2

Unloading of fish containers from sea vessels

39.2

3

-24

18

F12-3

Unloading of fish containers from sea vessels

39.8

3

-24

18

F12-4

Unloading of fish containers from sea vessels

40.4

3

-24

19

F13-1

Auction and Marshalling

46.7

3

-20

30

F13-2

Auction and Marshalling

47.3

3

-21

29

F13-3

Auction and Marshalling

47.8

3

-21

29

F13-4

Auction and Marshalling

48.3

3

-24

27

F14-1

Weighting Operation

51.4

3

-15

39

F14-2

Weighting Operation

51.9

3

-16

39

F14-3

Weighting Operation

52.4

3

-24

31

F14-4

Weighting Operation

52.9

3

-24

32

F15-1

Loading of fish containers to lorries

36.8

3

-23

17

F15-2

Loading of fish containers to lorries

37.2

3

-24

16

F15-3

Loading of fish containers to lorries

37.6

3

-24

16

F15-4

Loading of fish containers to lorries

38.0

3

-24

17

 

 

 

 

 

 

 

 

 

Step 4: Calculation of the total noise level

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference No.

Source

Corrected Leq (30 min), dB(A)

 

 

 

 

 

F1-1

Seawater Cooling Chiller

59

 

 

 

 

 

F1-2

Seawater Cooling Chiller

59

 

 

 

 

 

F2-1

Extraction Fan

29

 

 

 

 

 

F2-2

Extraction Fan

29

 

 

 

 

 

F2-3

Extraction Fan

28

 

 

 

 

 

F2-4

Extraction Fan

28

 

 

 

 

 

F2-5

Extraction Fan

29

 

 

 

 

 

F2-6

Extraction Fan

29

 

 

 

 

 

F3-1

RCP Mechanical Ventilation (At the roof floor of RCP)

54

 

 

 

 

 

F3-2

RCP Mechanical Ventilation (At the roof floor of RCP)

52

 

 

 

 

 

F4-1

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

30

 

 

 

 

 

F4-2

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

31

 

 

 

 

 

F4-3

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

29

 

 

 

 

 

F4-4

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

30

 

 

 

 

 

F4-5

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

31

 

 

 

 

 

F4-6

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

30

 

 

 

 

 

F4-7

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

31

 

 

 

 

 

F4-8

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

31

 

 

 

 

 

F4-9

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

31

 

 

 

 

 

F4-10

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

29

 

 

 

 

 

F6-1

Material Hoist

11

 

 

 

 

 

F6-2

Material Hoist

12

 

 

 

 

 

F6-3

Material Hoist

12

 

 

 

 

 

F6-4

Material Hoist

13

 

 

 

 

 

F6-5

Material Hoist

13

 

 

 

 

 

F7-1

Icing Machine

29

 

 

 

 

 

F7-2

Icing Machine

29

 

 

 

 

 

F8-1

Lorries parking

16

 

 

 

 

 

F8-2

Lorries parking

16

 

 

 

 

 

F8-3

Lorries parking

16

 

 

 

 

 

F8-4

Lorries parking

16

 

 

 

 

 

F8-5

Lorries parking

16

 

 

 

 

 

F8-6

Lorries parking

17

 

 

 

 

 

F8-7

Lorries parking

17

 

 

 

 

 

F8-8

Lorries parking

17

 

 

 

 

 

F8-9

Lorries parking

17

 

 

 

 

 

F8-10

Lorries parking

17

 

 

 

 

 

F8-11

Lorries parking

17

 

 

 

 

 

F8-12

Lorries parking

17

 

 

 

 

 

F8-13

Lorries parking

17

 

 

 

 

 

F8-14

Lorries parking

18

 

 

 

 

 

F8-15

Lorries parking

18

 

 

 

 

 

F8-16

Lorries parking

18

 

 

 

 

 

F8-17

Lorries parking

18

 

 

 

 

 

F8-18

Lorries parking

18

 

 

 

 

 

F8-19

Lorries parking

18

 

 

 

 

 

F8-20

Lorries parking

18

 

 

 

 

 

F8-21

Lorries parking

16

 

 

 

 

 

F8-22

Lorries parking

16

 

 

 

 

 

F8-23

Lorries parking

16

 

 

 

 

 

F8-24

Lorries parking

16

 

 

 

 

 

F8-25

Lorries parking

16

 

 

 

 

 

F8-26

Lorries parking

16

 

 

 

 

 

F8-27

Lorries parking

16

 

 

 

 

 

F8-28

Lorries parking

16

 

 

 

 

 

F8-29

Lorries parking

16

 

 

 

 

 

F8-30

Lorries parking

17

 

 

 

 

 

F8-31

Lorries parking

17

 

 

 

 

 

F8-32

Lorries parking

17

 

 

 

 

 

F8-33

Lorries parking

17

 

 

 

 

 

F8-34

Lorries parking

17

 

 

 

 

 

F8-35

Lorries parking

17

 

 

 

 

 

F8-36

Lorries parking

18

 

 

 

 

 

F8-37

Lorries parking

18

 

 

 

 

 

F8-38

Lorries parking

18

 

 

 

 

 

F8-39

Lorries parking

18

 

 

 

 

 

F8-40

Lorries parking

18

 

 

 

 

 

F10-1

Sampans Idling

28

 

 

 

 

 

F10-2

Sampans Idling

28

 

 

 

 

 

F11-1

Fish vessels Idling

28

 

 

 

 

 

F11-2

Fish vessels Idling

29

 

 

 

 

 

F11-3

Fish vessels Idling

29

 

 

 

 

 

F11-4

Fish vessels Idling

28

 

 

 

 

 

F11-5

Fish vessels Idling

28

 

 

 

 

 

F11-6

Fish vessels Idling

26

 

 

 

 

 

F11-7

Fish vessels Idling

26

 

 

 

 

 

F11-8

Fish vessels Idling

28

 

 

 

 

 

F11-9

Fish vessels Idling

28

 

 

 

 

 

F12-1

Unloading of fish containers from sea vessels

17

 

 

 

 

 

F12-2

Unloading of fish containers from sea vessels

18

 

 

 

 

 

F12-3

Unloading of fish containers from sea vessels

18

 

 

 

 

 

F12-4

Unloading of fish containers from sea vessels

19

 

 

 

 

 

F13-1

Auction and Marshalling

30

 

 

 

 

 

F13-2

Auction and Marshalling

29

 

 

 

 

 

F13-3

Auction and Marshalling

29

 

 

 

 

 

F13-4

Auction and Marshalling

27

 

 

 

 

 

F14-1

Weighting Operation

39

 

 

 

 

 

F14-2

Weighting Operation

39

 

 

 

 

 

F14-3

Weighting Operation

31

 

 

 

 

 

F14-4

Weighting Operation

32

 

 

 

 

 

F15-1

Loading of fish containers to lorries

17

 

 

 

 

 

F15-2

Loading of fish containers to lorries

16

 

 

 

 

 

F15-3

Loading of fish containers to lorries

16

 

 

 

 

 

F15-4

Loading of fish containers to lorries

17

 

 

 

 

 

 

Total Leq (30 min), dB(A)

63

 

 

 

 

 

 

 

 

Noise levels calculation due to future fixed noise sources  for NSR 15c (21/F) - Mitigated

 

 

 

 

 

 

 

 

 

 

 

Step 1: Inventory of Noise sources

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference No.

Equipment

No. of units

SWL,dB(A)

Reverberant Effect

With Silencer / Acoustic Louvre

Corrected SWL,dB(A)

 

F1

Seawater Cooling Chiller

2

106

 

P

81

 

F2

Extraction Fan

6

78

 

 

78

 

F3

RCP Mechanical Ventilation (At the roof floor of RCP)

2

101

 

P

76

 

F4

Mechanical Ventilation (At the higher level of sorting area - sea fronting)

10

101

 

P

76

 

F6

Material Hoist

5

87

 

 

87

 

F7

Icing Machine

2

96

P

 

102

 

F8

Lorries parking

40

84

P

 

90

 

F10

Sampans Idling

2

102

 

 

102

 

F11

Fish vessels Idling

9

102

 

 

102

 

F12

Unloading of fish containers from sea vessels

4

93

 

 

93

 

F13

Auction and Marshalling

4

94

P

 

100

 

F14

Weighing Operation

4

99

P

 

105

 

F15

Loading of fish containers onto trucks

4

84

P

 

90

 

Notes:

1. For those noise sources located within the Wholesale Fish Market Hall which is an enclosed space with an opening to the sea-side, a correction factor of +6 dB(A) is incorporated to account for the reverberant effect inside the WFM as a conservative assumption. For the sound pressure level inside a room due to fixed plant operation can be expressed as SPL=SWL+10log(Q/4pr^2+4/R) dB, where the term 10log4/R represents the reverberant sound field in a room. In a worst-scenario point of view, the term R would become unity and 10log4 equals 6. Therefore, without knowing the interior finishes of the room, we have assumed a +6 dB(A) correction for reverberant effect.

 

 

2. Assuming equipment incorporates with silencers with a maximum of 25dB(A) attenuation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Step 2: Calculation of distance correction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Kh = (20 log R) + 8

(Equation 2, reference from BS5228 equation D.3)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

where:

 

 

 

 

 

 

 

 

Kh

Distance adjustment, dB(A)

 

 

 

 

 

 

 

R

Slant distance between the sound source and the receiver, m

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reference No.

Source

SWL

R

Kh

Leq (30 min), dB(A)

 

 

F1-1

Seawater Cooling Chiller

81

124

49.9

31.1

 

 

F1-2

Seawater Cooling Chiller

81

121

49.7

31.3

 

 

F2-1

Extraction Fan

78

153

51.7

26.3

 

 

F2-2

Extraction Fan

78

157

51.9

26.1

 

 

F2-3

Extraction Fan

78

179

53.1

24.9

 

 

F2-4

Extraction Fan

78

173

52.8

25.2

 

 

F2-5

Extraction Fan

78

167

52.5

25.5

 

 

F2-6

Extraction Fan

78

162

52.2

25.8

 

 

F3-1

RCP Mechanical Ventilation (At the roof floor of RCP)

76

128

50.1

25.7

 

 

F3-2

RCP Mechanical Ventilation (At the roof floor of RCP)

76

152

51.6

24.2

 

 

F4-1

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

204

54.2

21.6

 

 

F4-2

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

201

54.0

21.8

 

 

F4-3

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

194

53.7

22.1

 

 

F4-4

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

191

53.6

22.2

 

 

F4-5

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

189

53.5

22.3

 

 

F4-6

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

182

53.2

22.6

 

 

F4-7

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

179

53.1

22.7

 

 

F4-8

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

176

52.9

22.9

 

 

F4-9

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

171

52.7

23.1

 

 

F4-10

WFM Mechanical Ventilation (At the higher level of sorting area - sea fronting)

76

170

52.6

23.2

 

 

F6-1

Material Hoist

87

210

54.4

32.5

 

 

F6-2

Material Hoist

87

199

54.0

32.9

 

 

F6-3

Material Hoist

87

187

53.4

33.5

 

 

F6-4

Material Hoist

87

175

52.9

34.0

 

 

F6-5

Material Hoist

87

169

52.5

34.4

 

 

F7-1

Icing Machine

102

152

51.7

50.3

 

 

F7-2

Icing Machine

102

148

51.4

50.6

 

 

F8-1

Lorries parking

90

177

52.9

37.1

 

 

F8-2

Lorries parking

90

174

52.8

37.2

 

 

F8-3

Lorries parking

90

170

52.6

37.4

 

 

F8-4

Lorries parking

90

168

52.5

37.5

 

 

F8-5

Lorries parking

90

164

52.3

37.7

 

 

F8-6

Lorries parking

90

161

52.2

37.8

 

 

F8-7

Lorries parking

90

159

52.0

38.0

 

 

F8-8

Lorries parking

90

159

52.0

38.0

 

 

F8-9

Lorries parking

90

156

51.9

38.1

 

 

F8-10

Lorries parking

90

154

51.7

38.3

 

 

F8-11

Lorries parking

90

151

51.6

38.4

 

 

F8-12

Lorries parking

90

148

51.4

38.6

 

 

F8-13

Lorries parking

90

145

51.2

38.8

 

 

F8-14

Lorries parking

90

144

51.1

38.9

 

 

F8-15

Lorries parking

90

141

51.0

39.0

 

 

F8-16

Lorries parking

90

139

50.9

39.1

 

 

F8-17

Lorries parking

90

138

50.8

39.2

 

 

F8-18

Lorries parking

90

137

50.7

39.3

 

 

F8-19

Lorries parking

90

135

50.6

39.4

 

 

F8-20

Lorries parking

90

133

50.5

39.5

 

 

F8-21

Lorries parking

90

182

53.2

36.8

 

 

F8-22

Lorries parking

90

181

53.2

36.8

 

 

F8-23

Lorries parking

90

178

53.0

37.0

 

 

F8-24

Lorries parking

90

175

52.9

37.1

 

 

F8-25

Lorries parking

90

173

52.8

37.2

 

 

F8-26

Lorries parking

90

171

52.7

37.3

 

 

F8-27

Lorries parking

90

166

52.4

37.6

 

 

F8-28

Lorries parking

90

164

52.3

37.7

 

 

F8-29

Lorries parking

90

165

52.3

37.7

 

 

F8-30

Lorries parking

90

161

52.1

37.9

 

 

F8-31

Lorries parking

90

158

52.0

38.0

 

 

F8-32

Lorries parking

90

155

51.8

38.2

 

 

F8-33

Lorries parking

90

153

51.7

38.3

 

 

F8-34

Lorries parking

90

150

51.5

38.5

 

 

F8-35

Lorries parking

90

147

51.4

38.6

 

 

F8-36

Lorries parking

90

144

51.2

38.8

 

 

F8-37

Lorries parking

90

142

51.0

39.0

 

 

F8-38

Lorries parking

90

141

51.0

39.0

 

 

F8-39

Lorries parking

90

141

51.0

39.0

 

 

F8-40

Lorries parking

90

139

50.9

39.1

 

 

F10-1

Sampans Idling

102

195

53.8

48.0

 

 

F10-2

Sampans Idling

102

192

53.7

48.1

 

 

F11-1

Fish vessels Idling

102

208

54.3

47.5

 

 

F11-2

Fish vessels Idling

102

204

54.2

47.6

 

 

F11-3

Fish vessels Idling

102

199

54.0

47.8

 

 

F11-4

Fish vessels Idling

102

189

53.5

48.3

 

 

F11-5

Fish vessels Idling

102

186

53.4

48.4

 

 

F11-6

Fish vessels Idling

102

214

54.6

47.2

 

 

F11-7

Fish vessels Idling

102

209

54.4

47.4

 

 

F11-8

Fish vessels Idling

102

201

54.1

47.7

 

 

F11-9

Fish vessels Idling

102

184

53.3

48.5

 

 

F12-1

Unloading of fish containers from sea vessels

93

207

54.3

38.7

 

 

F12-2

Unloading of fish containers from sea vessels

93

194

53.8

39.2

 

 

F12-3

Unloading of fish containers from sea vessels

93

182