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Code of Practice for Controlling Risks due to Noise on Ships 32 The sample duration is straightforward: how long was the measurement sample for this worker or task? Enter the L Aeq observed over the sample duration. Now enter the noise exposure duration appropriate to that worker or that duty: fractions of an hour will be adequate ... for instance ¼ hour, or 4½ hours. There is no need to fill in the Exposure Points or L EP,d while acquiring the noise data; save this job for some quiet time. There are only two more columns to be filled in during the survey. Enter the highest instantaneous peak L Cpeak observed during the sample duration. If there are comments or remarks, enter a number in the final, right‑hand column. Enter the actual numbered comment on a line at the bottom of the sheet. This completes the measurements and record for one seafarer or job; proceed to work through the crew roster. 6.4.5 Calculating Daily Personal Noise Exposure For each individual (or job) on the worksheet of Table 1, there is an observed L Aeq and a noise exposure duration. These two entries will be used with the Health and Safety Executive Ready Reckoner found in Appendix C. The method is straightforward: find the column for the appropriate noise exposure duration, then find the row for the recorded L Aeq . Where the column and row intersect, find the Exposure Points for the worker. Now go to the two right‑hand columns with the worker’s Exposure Points; find the L EP,d for your worker. A quick look at the Ready Reckoner values will explain how it works. Find the intersection between the 85 dB(A) Leq and 8 hours. This is 100 Exposure Points, which is equal to 85 dB(A) LEP,d . Think of this as 100% of a “bad noise day”. Refer to Appendix C for further explanation of the workings of the Exposure Point system, and how it may be used for adding varying levels for component tasks comprising one job or one workday. There is also information on daily and weekly exposures. Once familiar with Exposure Points, the noise assessor can easily complete the missing columns of the worksheet(s), which include a row for each noise‑exposed employee or class of worker. The worksheet(s) could be added to the noise report, as an attachment or appendix. The noise readings will certainly have to be recorded. 5958_MCA Noise v2_4.indd 32 26/2/10 10:02:03
Table 1. Worksheet: Measurement observations and results vessel: date: surveyor: start calibration level: vessel location during survey: end calibration level: LEP,d LCpeak see remarks below Exposure Points exposure duration meas. level, LAeq sample duration time of day position on ship plan name/job activity/location/ tool use Assessment of noise risks 5958_MCA Noise v2_4.indd 33 26/2/10 10:02:04 numbered remarks (from above): 33
Page 1 and 2: LONDON: TSO Code of Practice for Co
Page 3 and 4: Preface The EC Physical Agents (Noi
Page 5 and 6: Contents 1 Introduction 9 2 Scope o
Page 7 and 8: Appendix A Summary of responsibilit
Page 9 and 10: 1 Introduction The Merchant Shippin
Page 11 and 12: 2 Scope of the Code This Code of Pr
Page 13 and 14: 4 Application of the Code The 2007
Page 15 and 16: Effects of noise on crew necessaril
Page 17 and 18: Assessment of noise risks working o
Page 19 and 20: Assessment of noise risks Step 4: R
Page 21 and 22: Assessment of noise risks achievabl
Page 23 and 24: Assessment of noise risks The instr
Page 25 and 26: Assessment of noise risks There are
Page 27 and 28: Assessment of noise risks The main
Page 29 and 30: 6.4.4.2 Measurement procedure Asses
Page 31: Assessment of noise risks If sampli
Page 35 and 36: Assessment of noise risks ship mana
Page 37 and 38: The important stages in this manage
Page 39 and 40: Avoiding or reducing exposure to no
Page 43 and 44: Effective protection, dB 30 25 20 1
Page 49 and 50: 8 Health Surveillance Health survei
Page 51 and 52: Health Surveillance Reports on an i
Page 53 and 54: 10 Definitions These entries are in
Page 55 and 56: Attenuation Reduction of transmitte
Page 57 and 58: Decibel (dB) Definitions The unit f
Page 59 and 60: Impact/impulse noise Definitions A
Page 61 and 62: Reference pressure 20 μPa (micropa
Page 63 and 64: 11 Bibliography 11.1 UK Statutory I
Page 65 and 66: 11.4 Publications giving guidance B
Page 67 and 68: Regulation Number Person responsibl
Page 69 and 70: Appendix C Method of calculating Pe
Page 71 and 72: The sum of all the work tasks/perio
Page 73 and 74: Table C1 Exposure Points for variou
Page 75 and 76: Appendix D Format for reporting res
Page 77 and 78: Appendix D List any spaces non-comp
Page 79 and 80: Noise data sheets Appendix D Data s
Page 81 and 82: Table D1 Worksheet: Measurement obs
Page 83 and 84:
E.3 Using the attenuation informati
Page 85 and 86:
octave-band centre freq., Hz A-weig
Page 87 and 88:
E.3.4 Worked examples In order to e
Page 89 and 90:
E.3.4.2 Using the HML method to ass
Page 91 and 92:
(column 1) (2) (3) (4) (5) (6) (7)
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