Water Density Conversion (volume to mass flow)

Converts a water flow rate in gallons to a mass flow in pounds, the bridge between gpm and the lb/hr or lb/min needed for heat load math.

$$m=V\times 8.34$$

Variables

Symbol	Meaning	Unit
m	Mass (or mass flow)	lb (or lb/min)
V	Volume (or volume flow)	gal (or gpm)
8.34	Density of water	lb/gal

Worked example

1,000 gpm x 8.34 lb/gal = 8,340 lb/min.

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Part of The Blueprint of Water