Water Delivery Information

Pump Discharge Pressure (PDP) = Nozzle Pressure (NP) + Friction Loss (FL) of hoselay ± Head Pressure (HP)

GPM (Gallons Per Minute) and NP:

Forester

3/16 tip: 7 gpm (50 psi NP)
3/8 tip: 30 gpm (50 psi NP)

Variable Pattern (Adjustable Barrel)

1 inch: 20 gpm (100 psi NP)
1½ inch: 60 gpm (100 psi NP)

FL for 1″ hose:

10 gpm = 3 psi per 100 ft.
20 gpm = 10 psi per 100 ft.
30 gpm = 23 psi per 100 ft.

FL for 1½” hose:

20 gpm = 1 psi per 100 ft.
30 gpm = 3 psi per 100 ft.
60 gpm = 13 psi per 100 ft.

HP: Add or subtract 1 psi for every 2 foot elevation change.

Gallons of water to fill 100 feet of hose:

¾” hose ≈ 2 gals.
1″ hose ≈ 4 gals.
1½” hose ≈ 9 gals.

Maximum effective lift for drafting = 22 feet at sea level, 14 feet at 8,000 ft. elevation.

Loss of 1 foot draft per 1000 feet elevation.

Use check and bleeder valve on pump discharge when pumping uphill to prevent back flow into the pump.

A parallel hose lay will have ¼ the friction loss of a single hoselay.