Lubricating Lines to Stuffing Box
Lubricating liquid must be flowing to the stuffing box before the pump is started. Both mechanical seals
and packing require lubrication for continuous service.
Priming
The pump must be completely primed before operation.
2.6 Water Hammer
Water hammer is a high pressure surge within a closed pipe system, created by rapid change in the flow
rate. Changes in the flow rate occur when there are sudden changes in pump speed. The most common
cause is the sudden opening or closing of a valve or flow control device. Extensive damage to the pump
and pipeline is a result of water hammer.
2.7 Freezing
If the pump is exposed to below freezing temperatures, the liquid should be drained during idle periods.
2.8 Locating Problems
1.
Conditions Leading to Insufficient or No Discharge
1.
Insufficient speed.
2.
Excessive discharge head.
3.
Insufficient NPSH.
4.
Worn pump components.
5.
Incorrect direction of rotation.
6.
Incomplete pump priming.
7.
Impeller or discharge pipe clogged.
8.
Pumpage viscosity too high.
2.
Conditions Leading to Excessive Power Consumption
1.
Excessive speed.
2.
Pump operating at high horsepower area of the pump curve (off design point).
3.
Mechanical binding or rubbing of rotating element.
4.
Pumpage specific gravity and/or viscosity too high.
WARNING:
This unit must never be used without prior installation of the safety guards for rotating parts as
prescribed by O.S.H.A.
Operation of this pump with both suction and discharge valves closed for even brief periods of
time is unacceptable and a dangerous practice. It can rapidly lead to a violent pump failure.
2.6 Water Hammer
Model HS Installation, Operation, and Maintenance Manual
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Summary of Contents for Goulds Pumps HS
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