1 gallon of water = 231 cubic inches = 8.333 pounds


1 pound of water = 27.7 cubic inches


1 cubic foot of water = 7.5 gallons = 62.5 pounds
(salt water weighs approximately 64.3 pounds per cubic foot)


1 miner's inch 9 to 12 gallons per minute (gpm)

Formulas:

Pounds per square inch at bottom of a column of water

= height of column in feet x 4.34

Horsepower to Raise Water*

Horsepower =	gpm x total head in feet
	3960

*For liquids other than water, multiply the gpm x the liquid's specific gravity

Weight of Water in a Pipe

Pounds water = pipe length feet x pipe diameter inches² x .34



back to Engineering Reference Page