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Safety system in a fire line or Why fire line fitted with relief valve and drain valve



Relief valve:- Relief valve is provided if pumps are capable of developing the pressure exceeding the design pressure of water service pipes, hydrants & hoses. It assists to avoid any overpressure to develop in any part of the fire main.
The fire line is fitted with relief valve to prevent the damage to pipe in case , the V/L is fighting fire with the help of shore while in dry-dock.
Drain Valve :- Drain valve is fitted to drain the fire line when not in use & also prevent the damage to pipe due to icing, while V/L is operating in Sub-zero temperature area.

14 comments:

  1. answer for fitting relief valve is correct for 2nd reason but how pump can develop more pressure since it is centrifugal pump,,

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    Replies
    1. Relief valve is provided mainly to protect the line when water for fire fighting is supplied be an external source other than ship's fire pump. It can be from shore or from tug through international shore coupling

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    2. in case of centrifugal pumps, relief valve may or may not require. It depends on the performance curve of the centrifugal pump and the pressure for which its discharge line and its components are design for. If shut off pressure of the centrifugal pump exceed the design pressure of the discharge line, pressure safety device shall be provided.

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  2. If any hydrant is in use with a line pressure of 6-7 kg/cm2 and if valve is closed suddenly then sudden pressure nay build up in pipe leading to rupture the pipe.relief valve acts as safety device and releases the excess pressure.

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    Replies
    1. kindly advise as per which regulation? Need to answer

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  3. Where is the relief valve located in the fire line

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    Replies
    1. 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.

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    ReplyDelete
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    ReplyDelete
  6. Fire line releif valve is required by which regulation

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  7. what is the material of reief valve and isolating valve

    ReplyDelete

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