24
This is a proprietary document of Kirloskar Brothers Limited, Kirloskarvadi-416308, Dist-Sangli (India)
ISSUE DATE: 17.09.2010 LAST REV. DATE:
stuffing box is not properly packed, friction in stuffing box prevents turning the rotor by hand. On
starting the pump it is well to have the packing slightly loose without causing an air leak, and if it
seems to leak, instead of putting too much pressure on the gland, put some heavy oil in the stuffing
box until the pump works properly and then gradually tighten up the gland. The packing should be
occasionally changed.
BALL BEARINGS
Correct maintenance of ball bearings is essential. The bearing manufacturers give the following as a
guide to re-lubrication periods under normal condition.
Three monthly when on continuous duty.
Six monthly when on eight hour per day duty.
The bearings and housings should be completely cleaned and recharged with fresh grease after 2500
hrs. or the nearest pump overhaul time.
PRIMING
No pumping action occurs unless the pump casing is filled with the liquid. Pump casing and suction
pipe must therefore be completely filled with liquid and thus all air removed before the pump is
started. Several different priming methods can be used depending on the kind of installation and
service involved.
1) Liquid level above pump level.
Pump is set below liquid level of source of supply, so that liquid always flows to pump under
positive head.
2) Priming with foot-valve.
a. When pump is installed on suction lift with foot valve at the end of suction line, fill pump
with water from some outside source till all air is expelled and water flows through the
air vent.
b. When there is liquid under some pressure in the discharge pipe, priming can be effected
by bypassing the pressured liquid around the check and gate 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.
3) Priming by ejector
An ejector operated by steam, compressed air or water under pressure and connected to air
vent at the top of casing can be used to remove air from pump and prime the pump on suction
lift installations.
4) 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.
STARTING
The pump must not be started without being primed. Be sure that the driver rotates in the proper
direction as indicated by a direction arrow on the pump casing.
RUNNING
On account of its simple construction, the centrifugal pump requires practically no attention while
running. Lubrication at the bearings and manipulation of the glands are the only things that need
attention from the operator.
To Next Page
Loading...
Need help?
General
