1969-HKRS30-8-59_Part03 — Page 19

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(11) When carbon dioxide is used as an extinguishing medium for spaces containing boilers or machinery, the quantity of gas carried shall be sufficient to give a minimum quantity of free gas equal to the larger of the following quantities, either-

(a) 40 per centum of the gross volume of the largest space containing boilers or machinery, such volume being measured up to the level at which the horizontal area of the casing is 40 per centum or less of the gross area of such space; or

(b) 35 per centum of the gross volume of the largest space

containing boilers or machinery, including the casing: Provided that the aforesaid percentages may be reduced to 35 per centum and 30 per centum respectively for ships of under 2,000 tons, not being passenger ships, and provided that if two or more spaces containing boilers or machinery are not entirely separate they shall for the purposes of this regulation be con- sidered as forming one space.

(12) When carbon dioxide is used as the extinguishing medium for a space containing any oil-fired boiler or oil fuel installation, a quantity of gas which can be discharged without danger to the operator shall be available for manual application, by means of a suitable applicator, in the firing area of the boiler and in the vicinity of the oil fuel unit.

(13) When carbon dioxide is used as the extinguishing medium both for cargo spaces and for spaces containing boilers or machinery the quantity of gas shall not be required to be more than the maximum required either for the largest cargo compart- ment or machinery space.

(14) For the purpose of paragraphs (10), (11), (12), (13), (15) and (16) the volume of gas shall be calculated at 9 cubic feet to the pound.

(15) When carbon dioxide is used as the extinguishing medium for any space containing boilers or machinery the fixed piping system shall be such that 85 per centum of the gas required to provide the concentration referred to in paragraph (11) when applied to the space concerned can be discharged into that spacec within two minutes.

(16) Means shall be provided for giving audible warning to persons within the space when carbon dioxide other than that specified in paragraph (12) is about to be released into any work- ing space.

(17) When a system producing inert gas is used to provide smothering gas in a fixed fire smothering installation for cargo

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spaces, it shall be capable of producing hourly a volume of free gas at least equal to 25 per cention of the gross volume of the largest compartment protected in this way for a period of 72 hours.

(18) When steam is used as the extinguishing medium in cargo spaces the boiler or boilers available for supplying steam shall have an evaporation of at least one pound of steam per hour for each 12 cubic feet of the gross volume of the largest cargo compartment.

(19) The arrangements shall be such that steam will be avail- able immediately and will not be dependent on the lighting of boilers and that it can be supplied continuously until the end of the voyage in the quantity required by this paragraph in addition to any steam necessary for the normal requirements of the ship including propulsion and that provision is made for extra feed water necessary to meet this requirement.

(20) No part of the control, storage or generating arrangement of any fixed fire smothering gas or steam installation shall be situated forward of the collision bulkhead in any passenger steamer.

(21) Operating instructions in clear and permanent lettering shall be affixed to every fixed fire smothering gas installation or in a position adjacent thereto.

40. (1) Every fixed foam fire extinguishing installation fitted in compliance with these regulations shall be capable of discharg- ing through fixed discharge outlets in not more than 5 minutes, a quantity of foam sufficient to cover to a depth of 6 inches the largest single area over which oil fuel is liable to spread.

(2) An installation of the type referred to in paragraph (1) shall be capable of generating foam suitable for extinguishing oil fires and means shall be provided for the effective distribution of the foam through a permanent system of piping and control valves or cocks to discharge outlets, and for the foam to be effectively directed by fixed sprayers on other main oil fire hazards in the protected space either simultaneously or separately.

(3) Such an installation shall include mobile sprayers ready for immediate use in the firing area of the boiler and in the vicinity of the oil fuel unit.

(4) Every fixed foam fire extinguishing installation fitted in lieu of a fixed fire smothering gas installation required by these regulations to be provided in the oil cargo spaces of any tanker shall be capable of distributing on the decks over the oil cargo tanks through fixed discharge outlets in not more than 15 minutes

Fixed foamı fire extic- guishing installations.