Section 5 Survey reporting
Clasification Society 2024 - Version 9.40
Clasifications Register Rules and Regulations - Rules and Regulations for the Classification of Naval Ships, January 2023 - Volume 3 Additional Class Notations - Part 2 Naval Ship Safety - Chapter 7 Noise and Vibration Levels in Personnel Spaces - Section 5 Survey reporting

Section 5 Survey reporting

Parent topic: Chapter 7 Noise and Vibration Levels in Personnel Spaces

5.1 General

5.1.1 The survey report is to comprise the data and analysis for noise, sound insulation and vibration and is to be submitted to LR for consideration.

5.1.2 The survey report shall be prepared by the organisation undertaking the trial measurements, which is to be either LR, or a technical organisation approved by LR.

5.2 Noise

5.2.1 The reporting of results is to comply with ISO 2923 and Resolution MSC.337(91) – Adoption of the Code on Noise Levels on Board Ships – (Adopted on 30 November 2012)The Annex below is consolidated into Resolution MSC.337(91) and is to include:

  1. The results of public address and general alarm system testing, in addition to the acoustic insulation testing.
  2. Measurement locations indicated on a general arrangement plan including, where possible, the measured dB(A) level.
  3. Tabulated dB(A) noise levels, together with octave band analysis for positions where the level exceeds the specified criterion. The NR number is also to be given where octave band analyses have been conducted. The specified criterion may be considered satisfied if the NR number does not exceed the specified A-weighted value minus 5 dB(A).
  4. Ship and machinery details.
  5. Trial details:
    • Loading condition.
    • Machinery operating condition and settings.
    • Speed.
    • Average water depth under keel.
    • Weather conditions.
    • Sea state.
  6. Details of measuring and analysis equipment (e.g. manufacturer, type and serial numbers), including frequency analysis parameters (e.g. averaging time).
  7. Copies of the relevant instrument calibration certificates, together with the results of field calibration checks.
  8. Tabulated weighted sound reduction indices and corresponding frequency spectra.

5.3 Vibration

5.3.1 The report is to contain the following information:

  1. Measurement positions indicated on a general arrangement plan.
  2. The measured overall frequency weighted r.m.s. vibration levels, tabulated for all measurement locations and directions.
  3. Ship and machinery details.
  4. Trial details:
    • Loading condition.
    • Machinery operating condition and settings.
    • Speed.
    • Average water depth under keel.
    • Weather conditions.
    • Sea state.
  5. Details of measuring and analysis equipment (e.g. manufacturer, type and serial number), including frequency analysis parameters (e.g. resolution, averaging time and window function).
  6. Copies of the relevant instrument calibration certificates, together with the results of field calibration checks.
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