Goulds Pumps 3420 - IOM - Manual (Page 35)

Priming with an Ejector (Fig. 22)
On suction lift applications, an ejector (operated by steam,
compressed air, or pressurized water) connected to the top
of the casing (priming or vent connection) can be used to
remove air from the casing and suction line, thus priming
the pump.
1. Close the discharge valve.
2. Open the ejector supply valve in the steam, air, or
water line, valve “E”.
3. Open the priming isolation valve, “S”.
4. Once the unit is primed, close the priming isolation
valve, “S”.
5. Close the ejector supply valve, “E”.
6. Start the pump and open the discharge valve.
STARTING PUMP
1. Make sure the suction valve and any recirculation or
cooling lines are open.
2. Fully close or partially open the discharge valve as
dictated by system conditions.
3. Start the driver.
$
CAUTION
Immediately observe the pressure gauges. If the
discharge pressure is not quickly attained, stop the
driver, reprime, and attempt to restart.
4. Slowly open the discharge valve until the desired flow
is obtained.
$
CAUTION
Observe the pump for vibration levels, bearing
temperature, and excessive noise. If normal levels are
exceeded, shut down the pump and troubleshoot the
problem.
OPERATION
GENERAL CONSIDERATIONS
Always vary the capacity by regulating the discharge valve.
NEVER throttle the flow from the suction side.
The driver may overload if the pumpage specific gravity
(fluid density) is greater than originally stated or if the flow
rate is exceeded.
Always operate the pump at or near the rated conditions to
prevent damage resulting from cavitation or recirculation.
OPERATING AT REDUCED CAPACITY
s
! WARNING
DO NOT operate the pump below the minimum rated
flow or with the suction and/or discharge valves closed.
These conditions may create an explosive hazard due to
vaporization of the pumpage. This can quickly lead to
pump failure and physical injury. Refer to Appendix II
for the pump's minimum flow.
Damage occurs from:
1. Increased vibration levels - This affects the bearings,
stuffing box, and mechanical seal (if supplied).
3420 IOM 8/09
31
4
Fig. 22