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WARNING:
When installing in a potentially explosive environment, ensure that the motor is properly
certified.
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.
WARNING:
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.
Freezing
If the pump is exposed to below freezing temperatures, the liquid should be drained during idle
periods.
Locating problems
Conditions leading to insufficient or no discharge
• Insufficient speed.
• Excessive discharge head
• Insufficient NPSH.
• Worn pump components
• Incorrect direction of rotation
• Incomplete pump priming
• Impeller or discharge pipe clogged
• Pumpage viscosity too high
Conditions leading to excessive power consumption
• Excessive speed.
• Pump operating at high horsepower area of the pump curve (off design point)
• Mechanical binding or rubbing of rotating element.
• Pumpage specific gravity and/or viscosity too high
CAUTION: Always vary capacity with regulating valve in the discharge line. NEVER throttle
flow from the suction side
Model JC Installation, Operation and Maintenance Instructions
Pumps must be fully primed at all times during operation.
Operation
15
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