Goulds Pumps 3420 - IOM - Manual (Page 33)

PRIMING THE PUMP
Never start the pump until it has been properly primed.
Several different methods of priming can be used,
depending on the type of installation and service involved.
!
Pumps must be fully primed at all times during
operation.
s
! WARNING
If the pump is run dry, rotating parts within the pump
may seize to non-moving parts. This may result in
serious physical injury.
Suction Supply Above Pump
When the pump is installed as shown in Fig. 18, the pump
will prime itself.
1. Close the discharge valve.
2. Open the suction valve.
3. Remove the vent plugs or open the vent valves on the
top of the pump and the two suction lobes until all air
is expelled and fluid flows through the openings.
4. Replace the vent plugs or close the vent valves.
5. Start the pump and open the discharge valve.
The pump will continue to be primed for any future
starting. This method is the simplest and, particularly for
automatic operation, the safest. A float switch in the
suction reservoir can be arranged to stop the pump, should
the liquid supply fall below minimum levels.
Suction Supply Below Pump
A. Priming with a Foot Valve - With the pump installed on
a suction lift and with a foot valve at the end of the suction
line, priming can be done any of the following three ways:
Outside Supply (Fig. 19)
1. Close the discharge valve.
2. Remove the vent plugs or open the vent valves on the
top of the pump and the two suction lobes.
3. Open the valve in the priming supply line. Fill the
pump until all air is expelled and fluid flows through
the vents.
4. Replace the vent plugs or close the vent valves and
close the valve in the priming supply line.
5. Start the pump and open the discharge valve.
The pump will continue to be primed for any future
starting.
3420 IOM 8/09
29
4
Fig. 18
Fig. 19