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Is the discharge side of a fire pump required to step up to a larger pipe size on the discharge flange of the fire pump? Inspected a pump where there was a flowmeter welded on flanged pipe which was the same size as the discharge flange of the fire pump.
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3 Comments
Wayne Ammons
11/28/2018 02:49:35 pm
A flow meter is typically installed in piping that bypasses around the pump. I have never seen one installed directly on the discharge flange in the manner you describe. NFPA 20 (2013 edition) requires that the fire pump discharge components be sized not less than the sizes indicated in Table 4.26(a).
Peter
11/28/2018 08:28:12 pm
Just to echo and add on to Wayne, if your purchase a pump that already has the diameter discharge and suction flanges that align with the pipe diameters in Table 4.26, no reducers are needed on either flange. I've designed the flow meter into a parallel bypass that has a butterfly valve on either side. Flow meters I've spec'ed have had the diameter dictated by the manufacturer to correspond with 150% of the rated flow of the pump, which coincidentally has also been the same as the discharge for the rated flow in Tbl 4.26.
John Galante*
1/13/2021 08:06:27 pm
If a fire pump is supplied from above should theeccentric be installed with the flat side down Leave a Reply. |
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