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ISO PRO Centrifugal Pump
Section 6.....................................................Commissioning and Operation
ii. When there is liquid under some pressure in the discharge pipe, priming can be effected by
bypassing the pressure liquid around the check and isolation valve. Of course, the initial priming
must be affected from some outside source.
NOTE: In this case, the foot valve must be capable of withstanding pump pressure and possible
surge.
(c) Priming by ejector: An ejector operated by steam, compressed air or water under pressure and
connected to air vent on top of casing can be used to remove air from and prime the pump on
suction lift installations.
(d) Priming by dry vacuum pump: a hand or power pump sucks in all the air from the casing and the
Suction pipe, and thus primes the system.
4. LUBRICATION
Refer section 3. Re-lubricate as indicated in this Section 3.
5. RUNNING
On account of its simple construction, the centrifugal pump requires practically no attention
while running. Lubrication of the bearings and manipulation of the glands are the only things
that need attention from the operator.
6. PUMPS FITTED WITH WEAR RINGS
Casing and impeller wear rings are fitted in the casing and impeller to reduce the quantity of
water leaking back from the high pressure side to the suction side. When these wear rings are
worn out, the clearance becomes greater and more water passes back into the suction. They must be
replaced from time to time to restore the pump efficiency to its normal value.
7. PUMP STARTUP
a) Close discharge valve if valve is not already closed. Crack open the valve to assure minimal flow.
b) Prepare the driver for start up in accordance with the driver manufacturer's instructions.
c) Prime pump and ensure suction valve is open.
d) If pump re-circulating line is used, ensure it is open, clear and free of obstructions.
e) Turn on cooling liquid and assure correct flow exists (to cooler, insert gland etc.) as specified.
f) Double check pump rotation by starting unit momentarily. The direction of input shaft rotation is
clockwise when facing pump shaft from coupling end. Ensure that the pump coasts down to
a gradual stop.
g) Start the driver and bring it up to speed.
h) As soon as the pump is up to rated speed slowly open discharge valve.
i) This will avoid abrupt changes in velocity and prevent surging in the suction line.
j) Perform the operating checks
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