Slurry Pump
WH15AM1AAA0EN_06B.DOC JAN 05-W02
Operation
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8 OPERATING INSTRUCTIONS
8.1 Start-up
1. If the pump has just been maintained or has not been put into operation for some
time, then carry out the pre-start checks as described in Commissioning, section 7.
2. Open the pump inlet and outlet valves.
3. Check for leakage from the inlet and outlet connections.
NOTE: AN INLET-SIDE LEAK MAY CAUSE THE PUMP TO DRAW AIR DURING OPERATION, THUS
DRASTICALLY REDUCING ITS PUMPING CAPACITY.
4. If a water flushed gland is fitted, ensure that the water supply is turned on, and water
is available at the correct pressure and flow rate.
5. If a mechanical seal is fitted, see section 9.5.3 before start up.
6. If auxiliary priming equipment is fitted, start the priming pump.
7. Start the pump drive motor.
8.2 Shutting down
The appropriate shutdown procedure for any installation depends on the slurry being
pumped, and more generally on the process requirements upstream and downstream of
the pump. What follows, therefore, may only be regarded as general guidelines for
ensuring some degree of protection for the pump without reference to the particular
application.
• Where practicable, switch the pump to clean water and allow the pipeline to be flushed
through before shutting down.
• In case of systems with substantial discharge pipework and/or head of slurry, means of
isolating the pump or draining the system should be provided –see section 6.5.
CAUTION
STOPPING THE PUMP WHEN THERE IS A HEAD OF SLURRY IN THE DISCHARGE PIPE SHOULD BE
AVOIDED AS THIS COULD RESULT IN DAMAGE TO THE GLAND AND/OR PUMP.
• Having shut down the pump on clean water, close its isolating valves and then drain
the pump and its pipework, if required.
CAUTION
ALWAYS CLOSE THE OUTLET VALVE FIRST. NEVER CLOSE THE INLET VALVE WHILE THE PUMP IS
RUNNING.
NOTE: REVERSE FLOW, IN ADDITION TO POSING A RISK OF DAMAGE TO THE SHAFT SEAL, CAN ALSO
CAUSE THE IMPELLER TO SPIN IN THE REVERSE DIRECTION. STARTING THE PUMP UNDER
THESE CONDITIONS MIGHT CAUSE DAMAGE TO A MECHANICAL SEAL, IF FITTED, AND/OR CAN
IN EXTREME CASES CAUSE THE SHAFT TO SHEAR. AN OVERRIDE CIRCUIT IS RECOMMENDED
TO PREVENT THE PUMP BEING STARTED INADVERTENTLY WHILE THE IMPELLER IS ROTATING.
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