KR launches notation for underwater radiated noise

The class notation and Guidance are based on ISO 17208 (International standard of quantities and procedures for description and measurement of underwater sound from ships). The Guidance covers the noise standard for two operating conditions: normal operation (transit) and quiet operation (quiet).

The class notation is given in the form of ‘URN-T(20)’ which indicates that when a ship operates at a speed equivalent to 20 knots in still water, it meets the transit criteria for underwater radiated noise. URN is an abbreviation for underwater radiated noise.

The IMO’s Marine Environment Protection Committee (MEPC) is discussing measures to mitigate this growing challenge, and the IMO’s Sub-Committee on Ship Design and Construction (SDC 8) which met from 17 to 21 January discussed reducing underwater noise from ships. As a result, new regulations are expected shortly, which will determine sensitive areas to noise, where ships calling in that area will be required to meet appropriate standards for underwater radiated noise.

Several countries and ports have already introduced regulations relating to underwater radiated noise, and some ports, such as the Port of Vancouver, are offering discounts on port user fees for vessels that meet the standards.

KR plans to actively support its customers’ compliance with regulations on underwater radiated noise with news services, including technical services which will enable customers to implement low-noise ship technology.