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the conditions and at the pressure specified in regulation 33, which shall not be less than the quantity obtained from the following formula--
Quantity of water in tons per hour Ca
Where-
(i) = 5 for ships required to be provided with more than one fire pump (excluding any emergency fire pump) and C 2.5 for ships required to be pro- vided with only one fire pump, and
(1) d
where-
LB+D) 1+
2500
to the nearest ; and
L= length of the ship in feet on the summer load water- line from the fore side of the stem to the after side of the rudder post. Where there is no rudder post, the length is measured from the fore side of the stem to the axis of the rudder stock. For ships with cruiser sterns, the length shall be taken as 96 per centum of the total length on the designed summer load waterline or as the length from the fore side of the stem to the axis of the rudder stock if that be the greater;
B
D
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greatest moulded breadth of the ship in feet; and
moulded depth of the ship in feet measured to the bulkhead deck amidships:
Provided that in any such ship the total capacity of the fire pumps for fire fighting purposes shall not be required to exceed 180 tons per hour.
(3) Every fire pump required by these regulations to be operated by power shall, except as expressly provided otherwise in these regulations, be operated by a means other than the ship's main cogines.
(4) Fire pumps provided in compliance with these regula- tions may be sanitary, ballast, bilge or general service pumps provided that they are not normally used for pumping oil and that if they are subject to occasional duty for the transfer or pumping of oil, suitable change-over arrangements are fitted and operating instructions are conspicuously displayed at the change- over position.
(5) In every ship to which these regulations apply which is required by these regulations to be provided with more than one fire pump operated by power (other than any emergency pump) every such fire pump shall have a capacity of not less than 80
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per centum of the total capacity of the fire pumps required by paragraphs (1) and (2) divided by the number of fire pumps re- quired by these regulations to be provided in the ship:
Provided that when more fire pumps operated by power than are required by these regulations are provided in any ship, the Director may permit the capacity of any such additional fire pumps to be less than 80 per centum.
(6) Every fire pump required by these regulations which is operated by power shall be capable of producing from any fire hydrant or hydrants in the ship, at least the minimum number of jets of water required by these regulations as appropriate to the class and tonnage of the ship, while maintaining the pressure re- quired by paragraph (2) of regulation 33.
(7) Relief valves shall be provided in conjunction with all fire pumps if the pumps are capable of developing a pressure ex- ceeding the design pressure of the fire main, water service pipes, hydrants and hoses.
(8) Such relief valves shall be so placed and adjusted as lo prevent excessive pressure in any part of the fire main system.
(9) Every centrifugal pump which is connected to the fire main shall be fitted with a non-return valve.
(10) In every ship of Groups 1 and 2 to which these regu- lations apply, every emergency fire pump shall be situated in positious aft of the ship's collision bulkhead.
33. (1) In every ship which is required by these regulations to be provided with fire pumps operated by power, the diameter of the fire main and of the water service pipes connecting the hydrants thereto shall be sufficient for the effective distribution of the maximum discharge required by these regulations from- (a) where only one pump is required by the regulations, that
pudip: or
(b) where two such pumps are so required. both pumps
operating simultaneously; or
(c) where more than two such pumps are so required. the
two largest of such pumps operating simultaneously: Provided that in any ship other than a passenger steamer the diameter of the fire main and of the water service pipes shall be required to be sufficient only for the discharge of 140 tons per hour.
(2) When the fire pumps required by these regulations are discharging the quantity of water required by paragraph (1)
Fire main, water servICE pipes and bydrants.
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