cause distortion, possible misalignment, and probable
rapid wear of the pump. Do not use the pump to correct
errors in piping layout or assembly.
12.
All joints of the piping system should be tight; pipe
sealer will help assure leak-free threaded joints. Leaks
in the suction line permitting air to be drawn in may
cause a noisy pump or a reduction in capacity. It is not
recommended to use PTFE tape on NPT ports as a pipe
sealer. This action can result in cracks in the pump.
13. ALIGNMENT
- Check the alignment of the drive after the
piping is hooked up. As a final check on pump alignment,
remove the head of the pump and with a feeler gauge
determine if there is clearance all the way around between
the rotor and casing. Because of manufacturing tolerances,
bushing clearances, etc., the rotor may not be centered
in the casing, but it should not drag; dragging would
indicate unit misalignment or casing distortion from piping
strain. Making this check is most desirable on installations
involving Q, M and N size general purpose pumps.
14.
The auxiliary piping hooked to jackets, glands, etc. for
heating, cooling, quenching, or for other purposes should
receive the same attention as the piping handling the
pumped liquid.
15.
Provide a pressure relief device in any part of a pump and
piping system that can be valved off and, thus, completely
isolated. This is particularly important:
a.
When handling a cold liquid such as refrigeration
ammonia that can warm up to ambient temperatures
when the pump is shut off.
b.
When handling a liquid such as asphalt or molasses
that has to be heated before it can be pumped.
The rise in temperature causes the liquid to expand; if there
is no provision for pressure relief in the closed off section,
there is a chance that the pump or piping will rupture.
FIGURE A13
Go around the
obstruction on
the horizontal
Obstruction
DO THIS
NOT THIS
Obstruction
FIGURE A14
Keep Long Horizontal
Line Below Liquid Level
DO THIS
NOT THIS
START UP
Before starting the pump, check the following:
1.
Are there vacuum and pressure gauges on or near the
pump? These gauges are the quickest and most accurate
way of finding out what is happening in the pump.
2.
Check alignment - See suggestions in the Alignment
section of this manual.
3.
Check piping to be sure there is no strain on the
pump casing.
4.
Rotate the pump shaft by hand to be sure it turns freely.
MAKE SURE THE PUMP DRIVER IS LOCKED OUT OR
CANNOT BE ENERGIZED BEFORE DOING THIS.
5.
Jog motor to be sure it is turning in the right direction; refer
to discussion on pump rotation under item 4 in
General
Installation Notes
section.
6.
Check any relief valves to be sure they are installed
correctly. Refer to discussion on relief valves in
General
Installation Notes
section.
7.
Check suction piping to be sure:
a.
It is all connected and tight
b.
Valves are open
c.
End of pipe is below liquid level
8.
Check discharge piping to be sure:
a.
It is all connected and tight
b.
Valves are open
c.
There is a place for the liquid to go
9.
Lubricate any grease fitting on the pump using a #2 NLGI
grease. Check any gear reducer, motor, coupling, etc.
for instructions and lubricate as recommended by the
manufacturer. See
Engineering Service Bulletin
ESB-515
at the end of the
Appendix
for Viking standard
grease types to check compatibility.
10.
For packed pumps, loosen packing gland nuts so gland
can be moved slightly by hand. Adjust gland to reduce
leakage only after pump has run long enough to reach
constant temperature. Packing should weep a little to keep
it cool and lubricated.
11.
Do not use the Viking pump to flush, pressure test or
prove the system with water. Either remove the pump or
run piping around it while flushing or testing. Pumping
water, dirty or otherwise, can do more damage in a few
minutes than months of normal service.
12.
Check to be sure all guards are in place.
13.
Check the pump to be sure it is heated to operating
temperature (if jacketed or heat traced).
If the pump begins to deliver liquid within 60 seconds, it
can continue to be operated. If liquid is not leaving the
discharge port, stop the pump. Running the pump longer than
one minute without liquid inside it can damage the pump.
Review the steps just outlined, consider what the suction
and discharge gauges indicate, and see
Troubleshooting
section. If everything appears to be in order, put some liquid
in the pump. This will help it prime.
The pump can be restarted. If nothing is flowing within two
minutes, stop the pump. The pump is not a compressor; it will
not build up much air pressure. It may be necessary to vent
the discharge line until liquid begins to flow.
TSM 1741 | Issue B | Page 15 of 20
© 2019 Viking Pump, Inc. • Cedar Falls, IA
© Viking Pump, Inc.
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