IMO Regulation and IACS classifications, Noise survey at onboard ships and offshore installations needs special attention to reduce human fatigue and to reduce the risk of miscommunication and human errors. Permanent hearing loss might be a consequence of working environments with high noise levels. Noise radiation from ships and offshore installations do also have an environmental impact.
Based on the IMO Regulations of Noise Monitoring; Noise Zones may categorize as
Maximum exposure with protection [Zone A]
Daily exposure [Zone D]
Occasional exposure [Zone B]
Occasional exposure [Zone C]
Maximum Noise exposure with protection [Zone A]: No Marine crews even with ear protectors should be exposed to level exceeding 120 dB (A) or to a Leq (24) exceeding 105 dB (A) can considered as Max. Noise exposure with Max. protection.
Daily exposure [Zone D] – Marine crews working in a D zone sound area on daily basis, ear protection should be worn and a hearing conservation program may be considered.
Occasional exposure [Zone B] – In Zone B occasional exposures should be allowed in zone B and both ear muffs and ear plugs should be used unless the exposure duration is restricted to not more than 10 minutes when only ear muffs or plugs are required.
Occasional exposure [Zone C] – In Zone C only occasional exposure should be allowed and ear muffs or plugs should be required
Preparation of Noise Specifications.
Noise Analysis at Various locations
Machinery vibration measurements, Noise monitoring, Noise analysis, troubleshooting and diagnosis.
Noise Measurement Inspection and Noise analysis of structural and piping vibrations at various operating frequency.
Recommendation to meet the acceptable noise level measurements.
Standards for noise
IMO Resolution A.468(XII) – Code on Noise Levels on Board Ships
Real time octave band analyzer –integrating sound level meter with octave and 1/3 octave band real time display with Field noise level calibrator. Meets ANSI and IEC Type 2 standards.
Approved by all major IACS Classification Societies.
Why EIWAA ….?
Avoid expensive redesign.
Reduce Noise at onboard existing ships and offshore installations.
Comply with Rules, Standards and regulations.
Ensure good working environment.
Avoid technical problems due to vibrations.