Sun Pumps SPB 10-16C-1.0 - Manual (Page 7)

INLET SUPPLY should be adequate to accommodate the maximum flow being
delivered by the pump.
Open inlet shut-off valve and turn on water supply to avoid cavitating pump.
DO NOT RUN PUMP DRY Starting a pump dry will damage the piston cups
immediately. If there is a possibility of the pump ever running dry, low water level
controls should be used.
When using an inlet supply reservoir, size it to provide adequate fluid to accommodate
the maximum output of the pump, generally a minimum of 6-10 times the GPM
(however, a combinations of system factors can change this requirement); provide
adequate baffling in the tank to eliminate air bubbles and turbulence; install diffusers on
all return lines to the tank.
INLET LINE SIZE should be adequate to avoid starving the pump.
Line size must be a minimum of one size larger than the pump inlet fitting.
Avoid thick walled fittings, tees, 90 degree elbows or valves in the inlet line of the
pump to reduce the risk of flow restriction and cavitation.
The line MUST be a FLEXIBLE hose, NOT a rigid pipe, and reinforced on SUCTION
systems to avoid collapsing.
The simpler the inlet plumbing the less the potential for problems. Keep the length
to a minimum, the number of elbows and joints to a minimum (ideally no elbows) and
the inlet accessories to a minimum
. Use pipe sealant to assure air-tight, positive sealing pipe joints.
After prolonged storage, pump should be purged of air to facilitate priming.
Disconnect any discharge port and allow fluid to pass through pump.