Statutory Documents - MCA Publications - PYC - A Code of Practice for Yachts Carrying 13 to 36 Passengers (The Passenger Yacht Code) - Chapter 4 - Construction, Subdivision and Stability - Part VI - Alternative Subdivision and Stability Standards for Passenger Yachts not Exceeding 80 Metres in Length (L) Where Compliance With Regulation 6 and 7 Of SOLAS II-1 Part B-1 Proves Impracticable - 4.26 Permeability:
4.26 Permeability:
(1) The definite assumptions referred to in section 4.25 relate to the permeability of the spaces below the margin line.
(2) In determining the floodable length, a uniform average permeability shall be used throughout the whole length of each of the following portions of the ship below the margin line-
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(a) the machinery room;
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(b) the portion forward of the machinery room; and
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(c) the portion abaft the machinery room.
(3) The uniform average permeability throughout the machinery room shall be determined from the formula-
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where-
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a = the passenger spaces;
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c = the volume of between-deck spaces below the margin line within the limits of the machinery room which are appropriated to stores; and
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v = the whole volume of the machinery room below the margin line.
(4) Where it is shown to the satisfaction of the Administration that the average permeability as determined by detailed calculation is less than that given by the formula, the detailed calculated value may be used and for the purpose of such calculation, the permeability of passenger spaces shall be taken as 95, that of all store spaces as 60, and that of double bottom, oil fuel and other tanks at such value as may be approved in each case.
(5) Except as provided in subsection (6), the uniform average permeability throughout the portion of the ship forward of or abaft the machinery room shall be determined from the formula-
where-
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a = the volume of the passenger spaces, as defined in which are situated below the margin line, forward of or abaft the machinery room; and
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v = the whole volume of the portion of the ship below the margin line forward of or abaft the machinery room
(6) In the case of unusual arrangements the Administration may allow, or require, a detailed calculation of average permeability for the portions forward of or abaft the machinery room and for the purpose of such calculation, the permeability of passenger spaces shall be taken as 95, that of spaces containing machinery as 85, that of all store spaces as 60, and that of double bottom, oil fuel and other tanks at such value as may be approved in each case.
(7) Where a between-deck compartment between two watertight transverse bulkheads contains any passenger or crew space, the whole of that compartment, less any space completely enclosed within permanent steel bulkheads and appropriated to other purposes, shall be regarded as passenger space.
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