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5.12 Pump priming
WARNING:
These pumps are not self priming and must be fully primed at all times during operation. Loss
of prime can lead to excessive heat and severe damage to the pump and seal.
WARNING:
Pumps that are not self-priming must be fully primed at all times during operation.
WARNING:
A build-up of gases within the pump, sealing system, or process piping system may result in an
explosive environment. Make sure the process piping system, pump and sealing system are
properly vented prior to operation.
5.12.1 Prime the pump with the suction supply above the pump
1.
Slowly open the suction isolation valve.
2.
Open the air vents on the suction and discharge piping until the pumped fluid flows out.
3.
Close the air vents.
1
2
3
Item Description
1.
Discharge isolation valve
2.
Check valve
3.
Suction isolation valve
Figure 45: Suction supply above pump
5.12.2 Prime the pump with the suction supply below the pump
Use a foot valve and an outside source of liquid in order to prime the pump. The liquid can come from
one of these sources:
•
A priming pump
•
A pressurized discharge line
•
Another outside supply
1.
Close the discharge isolation valve.
2.
Open the air vent valves in the casing.
3.
Open the valve in the outside supply line until only liquid escapes from the vent valves.
4.
Close the vent valves.
5.12 Pump priming
68
XHD Installation, Operation, and Maintenance Manual
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