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A FORUM FOR FIRE PROTECTION QUESTIONS & PE EXAM PROBLEMS | SUBSCRIBE NOW

Flow Test with Higher Residual than Static

7/3/2018

1 Comment

 
Had an experienced fire sprinkler contractor run a flow test in a semi-remote area (outside of a large metro area) with a higher residual pressure (45 psi) than static (42 psi). The static pressure was confirmed both before and after the flow test. The flow was relatively low (410 gpm using a 1-3/4" pitoless little hose monster).

I've yet to come across a scenario like this before - could this be due to the city's pumps kicking on during the test, or something else? Wondering if anyone had experience in this regard before.

Note: This is a Daily Discussion question submitted anonymously to us by a toolkit member. See the discussion here.
1 Comment
Nimal Tissa Wijetunga
7/4/2018 10:08:37 am

My experience is always an above ground water tank(not overhead tank) as Private fire main to supply water to Sprinkler system and in that scenario, I found Static pressure is zero or 2 - 3 psi and the residual pressure is between 100 to 140 psi.

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  • Blog
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  • TOOLS
    • TOOLKIT (FREE TRIAL)
    • *TOOLKIT (PURCHASE)
    • SUBMIT AN IDEA
    • BACKFLOW DATABASE*
    • CLEAN AGENT ESTIMATOR
    • CLOUD CEILING CALCULATOR
    • DOMESTIC DEMAND
    • FIRE PUMP ANALYZER
    • FIRE PUMP DATABASE*
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    • NFPA 13 EDITION TRANSLATOR ('99-'19)*
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    • OBSTRUCTIONS AGAINST WALL*
    • PLUMBING FIXTURE COUNTS
    • REMOTE AREA ANALYZER
    • QUICK RESPONSE AREA REDUCTION
    • SPRINKLER DATABASE*
    • SPRINKLER FLOW*
    • TEST & DRAIN CALCULATOR
    • THRUST BLOCK CALCULATOR
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    • WATER SUPPLY (METRIC)
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