WATERAX
VERSAX Owner's Manual
11/2015
9
Drafting
Before you draft
Pumps should not be run dry, and therefore the pump ends require priming prior to
operation. Use this procedure if you are drafting water from an open tank or natural water
source.
To maintain optimum performance from your pump, follow these recommendations for
selecting and installing your suction hose or pipe:
Use the shortest length possible, i.e., place the pump as close to the water as
possible.
Select reinforced crush resistant (non-collapsible) hose or pipe.
Make sure that all pipes have air tight fittings.
To avoid air locks, flexible hose should rise gently from the water source to the
suction/inlet port without excessive dips, bumps, sharp angles or rise in its lay.
Pipes should be equal to or larger than the diameter of the suction/inlet port.
Suction strainers should be fitted to prevent foreign matter from entering the
pump.
Where practicable, the installation and use of a suction float will aid in the
performance of your pump, by keeping suction away from the debris on the
bottom of the dam or river.
Ensure that the suction hose is completely submersed.
Limitations
Several factors can affect the pump’s ability to efficiently draft water. The following
limitations should be taken into account.
Water temperatures above 35 °C (95 °F) can cause noticeable loss in pump
performance.
Barometric pressures below 98 kPa (29 in of Hg) can also cause noticeable loss
in pump performance (specifically elevations >2000 feet above sea level).
Pump performance curves are based off a 5 foot lift (top of water source to
impeller center). Lifts greater than 5 feet will decrease the pump’s performance.
Hose and strainer sizes that are too restrictive can significantly decrease the
pump’s performance.
Intake hose runs in excess of 10 feet can also reduce pump performance.
Self-priming maximum lift is of 11.5 feet. The use of a foot-valve will improve self-
priming efficiency. Performing lifts greater than 11.5 feet will require the use of a
primer.
