Chapter 1 – General
Paragraph 1.3.8
Passenger spaces where they are also occupied by crew such as recreation
rooms and open recreation areas should be considered as "other passenger spaces", and
therefore are not subject to the Code. However, bulkhead and decks of crew cabins and
hospitals adjacent to such rooms/areas should have the weighted sound reduction index
(Rw) in compliance with paragraph 6.2 of chapter 6.
Paragraph 1.4.21
Navigating bridge wings include enclosed navigating bridge spaces.
Chapter 3 – Measurement
Paragraph 3.3.5
Air conditioning vents should be kept open during the taking of noise
measurements on board, unless they are designed to be kept closed in the normal
operating condition.
Paragraph 3.3.6
Closing devices of ventilation grilles/louvres of cabin doors should be kept
open during the taking of noise measurements on board, unless they are designed to be
kept closed in the normal operating condition.
Paragraph 3.3.9
The wording "40% of maximum thruster power" means exactly "40% of maximum"
and does not mean "40% of 80% as required by paragraph 3.3.2 of the Code".
Paragraph 3.9
This provision only "acknowledges" the uncertainty; it does not represent any
"allowance".
Chapter 4 – Maximum acceptable sound pressure levels
Paragraph 4.2
1 A navigating bridge provided with radio equipment should be regarded as a
"navigating bridge" (65dB(A))."Radio rooms" mean separate rooms dedicated for
sending/receiving radio messages.
3 If a cabin is completely separated by more than one bulkhead from the airborne sound
source, those bulkheads are not required to have the airborne sound insulation
properties as required in chapter 6. For this purpose, bathroom/toilet/lavatory is not
regarded as a cabin but regarded as the origin of airborne sound to another cabin.
4 A room consisting of day-room and bedroom should be regarded as a single "cabin"
(60dB(A)/55dB(A)) in cases where the room is for single occupancy. For this purpose,
partitions (panel and door) between day-room and bedroom need not have the airborne
sound insulation properties as required in chapter 6.
Chapter 6 – Acoustic insulation between accommodation spaces
Paragraph 6.2.1
1 The requirements regarding airborne sound insulation properties for bulkheads also
apply to components installed in bulkheads (e.g. corridors to cabin doors).
2 In applying this requirement to bulkheads including components as mentioned in the
above, the following may apply:
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.1 In cases of bulkheads consisting of acoustic insulation panels and doors,
this requirement is considered satisfactory where each component forming the
surface of bulkheads (acoustic insulation panels and doors, etc.) has at
least the required Rw.
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.2 In cases where either acoustic insulation panels or doors forming part of
bulkheads have weighted sound reduction index inferior to that required by
section 6.2.1 of the Code, this requirement is considered satisfactory
provided that the Rw of bulkheads is not inferior to the required value,
i.e. the Rw of bulkhead calculated using both the airborne sound insulation
properties of the doors and those of the panels is not inferior to the
required value. As guidance on evaluation of the Rw of bulkheads, the
following formulae can be used:
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- Example: bulkhead consisting of acoustic insulation panels and doors:
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3 The requirements regarding airborne sound insulation properties for decks should also
apply to decks together with coverings and should, therefore, be tested in laboratory as
in the onboard arrangement. However, they need not apply to ceiling panels.
Paragraph 6.2.2
1 Closing devices of ventilation grilles/louvres of cabin doors should be kept open
during laboratory tests.
2 Doors should be tested together with the associated door frame. In cases where there is
no sill being part of the door frame, the doors should be tested with the gap specified
by manufacturers and with sealing materials, if fitted.