General Known Facts

It takes 30,000 psi to compress water 1%, so water is practically incompressible.

.1% psi will compress air the same amount.

One gallon of water weighs 8.33 lbs.

One gallon contains 231 cubic inches.

One square foot = 144 square inches. (12 x 12 = 144)

One cubic foot = 1,728 cubic inches. (12 x 12 x 12 = 1,728)

One cubic foot of water contains 7.48 (7.5) gallons of water.

One cubic foot of water weighs 62.4 lbs.

Pi = 3.1416	¼Pi = .7854

Area of a circle	=	3.1416 x radius2	or	.7854 x diameter2

Water weighs .433 psi per foot head.

2.31 ft. head of water exerts 1 psi.

Friction Loss Formulas:	Q = GPM in hundreds	Figured per hundred ft.

1¾” = 15.5Q2	2” = 8Q2	3” = Q2	4” = .2Q2	5” = .08Q2

GPM = 29.7 x diameter of tip2 x square root of nozzle pressure.