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NFPA13-10.10.2.1.3 Flushing Procedure

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Rober Cruz

Mechanical
Joined
Nov 10, 2016
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PA
Gentlemen:

We have a 4" C900 underground pipe which must be flushing. We have carried out a procedure for said flushing using a 2-1/2" Sch40 steel pipe externally with a hose of the same size to divert the flow in places that do not affect the building. The fire pump has a flow rate of 500 gpm and is what will be used for cleaning.
Our question is, is there any impediment in using the 2-1/2" pipe for flushing the 4" pipe with the flow rate of the fire pump.

Best Regards
Rober Cruz
 
No.

But the pressure drop might be quite high which might reduce your flow rate.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
33 fps probably not going to happen
 
You will only need about 150-200 gpm to flush the 4-Inch pipe. You will have to throttle the pump or send a portion of the flow to waste as the 2.5-Inch pipe will not flow at 500 gpm.
 
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