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  1. Biker Ben

    Calculations for restricted orifices to lower pressure below 100 PSI in a 1 1/2" Fire Hose.

    Thank you to everyone who responded. I apologize, I am not in front of a computer during the day. I only see these responses at night. I did search the internet and haven't found a calculation that I am confident with. In Sprinkler Design we use Hazen-Williams or occasionally...
  2. Biker Ben

    Calculations for restricted orifices to lower pressure below 100 PSI in a 1 1/2" Fire Hose.

    The header pressure is set to meet the demand of the sprinkler system via a fire pump and jockey pump. The only issue is restricting the pressure directly as the 1 1/2" hose valve to a maximum of 100 PSI and a minimum of 65psi. Today this is done using a pressure restricting hose valve with...
  3. Biker Ben

    Calculations for restricted orifices to lower pressure below 100 PSI in a 1 1/2" Fire Hose.

    Hi everyone, This is a fire protection question relating to NFPA 14 however, the fluid dynamics remain the same. There is code in NFPA 14 that limits the residual pressure at any 1 1/2" fire hose to 100 psi. In the old days, restricted orifices would be installed after the 1 1/2" hose valve...
  4. Biker Ben

    Calculations for 1 1/2" Hose Valve Restricted Orifice Insert?

    Hi everyone, First of all, I am aware that restricted orifice inserts are not the recommended method for maintaining residual pressure below 100 psi in 1 1/2" hoses. However, a friend of mine is the Fire Technician at a hospital with over 700 of these restricted orifices installed. During a...

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