4 Determination of area of operations
Clasification Society 2024 - Version 9.40
Statutory Documents - IMO Publications and Documents - Circulars - Maritime Safety Committee - MSC.1/Circular.1272 – Guidelines for the Approval of Fixed Water-based Fire-fighting Systems for Ro-Ro Spaces and Special Category Spaces Equivalent to that Referred to in Resolution A.123(V) – (4 June 2008)1 - Annex – Guidelines for the Approval of Fixed Water-based Fire-fighting Systems for Ro-Ro Spaces and Special Category Spaces Equivalent to that Referred to in Resolution A.123(V) - Appendix – Test Method for Fixed Water–Based Fire-Fighting Systems for Ro-Ro Spaces and Special Category Spaces - 4 Determination of area of operations

4 Determination of area of operations

 Both fire scenarios include hidden fires that burn intensely throughout the tests. The suppression tests as defined in paragraph 3.6.1 can be applied in establishing the area of operation of wet pipe, dry pipe and pre-action systems. The evaluation is based on the test with the largest number of nozzles activating.

 The ceiling area of 100 m2 as defined in paragraph 3.3.1 most likely is not sufficient for defining the area of operation. The ceiling should be large enough to allow installation of a sufficient number of nozzles so that it is unambiguous that the nozzles activating truly represent the maximum number of active nozzles.

 The area of operation is determined by multiplying the largest number of nozzles activating in the tests by two and defining the corresponding coverage area.

Parent topic: Appendix – Test Method for Fixed Water–Based Fire-Fighting Systems for Ro-Ro Spaces and Special Category Spaces
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