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Capacity of fire pumps
The capacity of the fire pumps is calculated as a product of the breadth, depth and length of the vessel but need not exceed 25m³ per hour.
Fire pumps
For cargo ships of 150 gross tons or more, a minimum of one fixed power pump and one portable pump are to be provided.
For cargo ships of less than 150 gross tons, one portable pump or alternative , is to be provided. which meets the criteria listed later
For fishing vessels, not less than one fixed power pump is to be provided.
Sanitary, ballast, bilge or general service pumps may be accepted as fire 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 fuel oil, suitable changeover arrangements are fitted.
In cargo ships and fishing vessels classed for navigation in ice, the fire pump sea inlet valves are to be provided with ice clearing arrangements .
Relief valves are to be provided in conjunction with any fire pump if the pump is capable of developing a pressure exceeding the design pressure of the water service pipes, hydrants and hoses. These valves are to be so placed and adjusted as to prevent excessive pressure in any part of the fire main system.
Portable Pumps

• The pump is to be self-priming.
• The suction head in operation is not to exceed 4,5 m.
• The portable fire pump, when fitted with its length of discharge hose and nozzle , is to be capable of maintaining a pressure sufficient to produce a jet throw of at least 12 m, or that required to enable a jet of water to be directed on any part of the engine room or the exterior boundary of the engine room and casing, whichever is the greater. In the case of ships less than 150t, it is to be ensured that a jet of water can be directed to any part of the ship.
• The pump set is to have its own fuel tank of sufficient capacity to operate the pump for three hours. (e) Details of the fuel type and storage location are to be submitted. If the fuel type has a flashpoint below 60АC, further consideration to the fire safety aspects will be given.
• The pump set is to be stored in a secure, safe and enclosed space, accessible from open deck and clear of the Category 'A' machinery space. In the case of ships less than 150ton , it is to be ensured that access to the pump will not be cut off in the event of a hold fire.
• The pump set is to be easily moved and operated by two persons and be readily available for immediate use.
• Arrangements are to be provided to secure the pump at its anticipated operating position(s).
• The overboard suction hose is to be non-collapsible and of sufficient length to cater for the ship's motion under all operational conditions. A suitable strainer is to be fitted at the inlet end of the hose.
• Any diesel-driven power source for the pump is to be capable of being readily started in its cold condition down to a temperature of 0 АC by hand (manual) cranking.
  
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