5.2 Pump priming
CAUTION:
•
The pump must be properly vented through the discharge head connections. This is im-
portant for liquids with suction pressures close to their vapor pressures. Vent piping must
continuously rise back to the suction source so that liquid cannot collect in the vent line.
NOTICE:
Net positive suction head available (NPSH
A
) must always exceed NPSH required (NPSH
R
) as
shown on the published performance curve of the pump.
Requirements
•
The minimum submergence must always be as indicated on the Certified Pump Outline Drawing.
•
Never run the pump dry as this can cause the rotating parts within the pump to gall and seize to the
stationary parts.
•
The parts are lubricated by the liquid being pumped unless the enclosed linshaft option is pur-
chased to lubricate the lineshaft bearings with a clean fluid.
5.3 Start the pump
WARNING:
Risk of equipment damage, seal failure and breach of containment. Ensure all flush and cool-
ing systems are operating correctly prior to starting pump.
NOTICE:
•
Risk of equipment damage due to dry operation. Immediately observe the pressure
gauges. If discharge pressure is not quickly attained, stop the driver immediately, reprime,
and attempt to restart the pump.
1.
Fully close the discharge valve, depending on system conditions.
2.
Start the driver.
3.
Slowly open the discharge valve until the pump reaches the desired flow.
4.
Immediately check the pressure gauge to ensure that the pump quickly reaches the correct dis-
charge pressure.
5.
If the pump fails to reach the correct pressure, perform these steps:
a) Stop the driver.
b) Restart the driver.
6.
Monitor the pump while it is operating:
a) Check the pump for bearing temperature, excessive vibration, and noise.
b) If the pump exceeds normal levels, then shut down the pump immediately and correct the prob-
lem.
7.
Repeat steps 5 and 6 until the pump runs properly.
5.2 Pump priming
Model VCW Installation, Operation, and Maintenance
51
Summary of Contents for Goulds Pumps VCW
Page 1: ...Installation Operation and Maintenance Model VCW ...
Page 2: ......
