Regulation 7-3 – Permeability
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Statutory Documents - IMO Publications and Documents - Resolutions - Maritime Safety Committee - Resolution MSC.429(98)/Rev.2 - Revised Explanatory Notes to the SOLAS Chapter II-1 Subdivision and Damage Stability Regulations - (adopted on 11 November 2020) - Annex - Revised Explanatory Notes to the SOLAS Chapter II-1 Subdivision and Damage Stability Regulations - Part B - Guidance on Individual SOLAS Chapter II-1 Subdivision and Damage Stability Regulations - Regulation 7-3 – Permeability

Regulation 7-3 – Permeability

Regulation 7-3.2

1 The following additional cargo permeabilities may be used:

Spaces Permeability at draught ds Permeability at draught dp Permeability at draught dl
Timber cargo in holds 0.35 0.7 0.95
Wood chip cargo 0.6 0.7 0.95

2 Reference is made to MSC/Circ.998 (IACS Unified Interpretation regarding timber deck cargo in the context of damage stability requirements) regarding timber deck cargo.

Regulation 7-3.3

1 Concerning the use of other figures for permeability "if substantiated by calculations", such permeabilities should reflect the general conditions of the ship throughout its service life rather than specific loading conditions.

2 This paragraph allows for the recalculation of permeabilities. This should only be considered in cases where it is evident that there is a major discrepancy between the values shown in the regulation and the real values. It is not designed for improving the attained value of a deficient ship of regular type by the modification of chosen spaces in the ship that are known to provide significantly onerous results. All proposals should be considered on a case-by-case basis by the Administration and should be justified with adequate calculations and arguments.

Parent topic: Part B - Guidance on Individual SOLAS Chapter II-1 Subdivision and Damage Stability Regulations
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