6.1 Underwater noise should be measured to an
objective standard for any meaningful improvements.
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.1 The International Organization for Standardization
(ISO) has developed the (ISO/PAS) 17208-1 – Acoustics –
Quantities and procedures for description and measurement of underwater
sound from ships – Part 1: General requirements for measurements
in deep water. This measurement standard is for deep water which implies
that the water depth should be larger than 150 m or 1.5 times overall
ship length (engineering method), whichever is greater. This is a
temporary publicly available standard. This standard is based on the
American National Standards Institute and the Acoustical Society of
America (ANSI/ASA) S12.64-2009 "Quantities and Procedures for Description
and Measurement of Underwater Sound from Ships, Part 1: General Requirements".
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.2 ISO is also developing ISO/DIS 16554 –
Ship and marine technology – Measurement and reporting of underwater
sound radiated from merchant ships – deep-water measurement,
which is expected to be published in 2013. The standard would provide
shipyards, shipowners and ship surveyors with a well-established measurement
method for underwater sound radiated from merchant ships for use at
the final delivery stage of ships.
6.2 Several research ships have been designed
using the noise specification proposed by the International Council
for the Exploration of the Sea (ICES) Cooperative Research Report
No.209 (CRR 209). It should be noted that the ICES CRR 209 noise specification
was designed for fishery research ships so that marine life would
not be startled during biomass surveys; it was not intended to be
used as a commercial ship design standard to prevent potential harm
of marine life. However, certain design arrangements used to meet
ICES CRR 209 may still be useful for new commercial ships to reduce
underwater noise.
6.3 Other underwater noise rating criteria are
available and may prove useful as guidance.