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What is the flow rate for a sprinkler system that uses 1/2" orifice sprinkler heads (K...

What is the flow rate for a sprinkler system that uses 1/2" orifice sprinkler heads (K = 5.4) with a residual pressure of 25 psi? Select one: a. 135 GPM b. 54 GPM c. None of these d. 72 GPM e. 27 GPM  

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Answers is choice E ,flow rate = 27 GPM

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