The building owner wants to connect the discharge piping from the pump relief valve to the pump suction pipe, just upstream of the suction valve. The water supply to the pump is a water storage tank. Anyone seen this arrangement? Is it acceptable?
NFPA 20, 2007 section 5.18.7 mentions "Discharge to Source of Supply". Is this to the tank or can it be also to the suction pipe? Both 5.18.7 and A5.18.7, seems to have a concern regarding the size of the relief valve and discharge piping, but does not provide much guidance (in my opinion). Anyone care to expand on this concern? The fire pump is rated 1000 gpm @ 105 psi. The source as mentioned previously, are gravity tanks. The relief valve is 4" and discharge pipe is 8" corresponding to Table 5.25. The discharge piping from the relief valve to connection at pump suction pipe has one elbow. At the connection to the pump suction there is a tee. Is the tee to be counted and the sizing be increased as per 5.18.6.2 ? Any pump experts? Tony _______________________________________________ Sprinklerforum mailing list http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
