Viking Pump TSM000: General Information - Manual (Page 6)

SECTION TSM 000 ISSUE I PAGE 6 OF 8
A Viking pump that is properly installed and maintained will give long
and satisfactory performance
NOTE: Before making any pump adjustment or opening the pump
liquid chamber in any manner, make sure that:
1. any pressure in the pumping chamber has been vented through
the suction or discharge lines or other openings provided for
this purpose,
2. the driver has been “locked out” so that it cannot inadvertently
be started while work is being done on the pump and
3. the pump has been allowed to cool down to the point where
there is no chance of anyone being burned
If trouble does develop, one of the first steps toward finding the
difficulty is to install a vacuum gauge in the suction port and a
pressure gauge in the discharge port Readings on these gauges
often will give a clue as to where to start looking for the trouble
TrOubLEShOOTiNg
vacuum gauge - Suction port
1. high reading would indicate -
a) Suction line blocked - foot valve stuck, gate valve closed,
strainer plugged
b) Liquid too viscous to flow through the piping
c) Lift too high
d) Line too small
2. Low reading would indicate -
a) Air leak in suction line
b) End of pipe not in liquid
c) Pump is worn
d) Pump is dry - should be primed
3. fluttering, jumping, or erratic reading -
a) Liquid vaporizing
b) Liquid coming to pump in slugs, possibly an air leak
insufficient liquid above the end of the suction pipe
c) Vibrating from cavitation, misalignment, or damage parts
rApid wEAr
CAuSE EvidENCE pOSSibLE SOLuTiON
1. AbrASivES Gouges or marks made by large, hard particles;
a rapid wearing away of bushings from very
small abrasives similar to pumice; or anything in
between
Flush the system with the pump removed Install strainer in suction
line Oftentimes after a system has run for a few cycles or a few days,
the dirt is pretty well cleaned out and if the pump is rebuilt into good
condition, it will then last for a long time
2. COrrOSiON Rust, pitting or metal appears to be “eaten” away Check the Viking General Catalog Liquid List for materials of
construction recommendation Consider weather all of the materials
used in pump construction were attacked; consider other materials
used in the system to determine how they resisted the liquid Check
to see weather or not the liquid has been contaminated to make it
more corrosive than anticipated
3. EXCEEdiNg
OpErATiNg
LiMiTS
Noisy operation, broken bushings, twisted shaft,
parts show evidence of high heat (discoloration)
Review General Catalog for operating limits on particular model
involved
4. iNSuffiCiENT
EXTrA
CLEArANCE
Pump may stall Evidence of heavy contact between
end of rotor teeth and head or other parts
Increase end clearance and/or contact you distributor or the factory
with details of the application so that information regarding proper
extra clearance may be provided
5. LACk Of
LubriCATiON
Noisy bearings, localized heating at bearings or lip
seal, smoke, rapid bushing wear
Be sure all grease fittings are greased before starting and instructions
for lubrication of drive equipment are followed; consider use of
auxiliary lubricating equipment
6. MiSALigNMENT Wear on only one part of a surface, e g , one side
of the casing, one side of the packing gland, only a
portion of the face of the head
Double check alignment of drive equipment and piping Check the
alignment under conditions as close to operating conditions as
possible
7. ruN dry Pump stalls because parts have uneven expansion
caused by frictional heat; galling between surfaces
having relative motion; seal seats and idler pins
changing color because of high heat
Be sure there is liquid in the system at the time of start up Provide
some kind of automatic alarm or shut-off if supply tank runs dry
13. Now you are ready to push the “start” button - gently
If the pump begins to deliver liquid within 60 seconds, you’re
in business If it does not, push the “stop” button Do not run the
pump longer than one minute without liquid in it; you may damage
it Review the steps just outlined, consider what the suction and
discharge gauges indicate, see page 6; if everything appears to be
in order, put some liquid in the pump, a lubricating liquid is best This
will help it prime
Push the “start” button again 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
If the pump still does not deliver, the cause may be one or more of
the following:
1.
Suction line air leaks; vacuum gauge reading should help
determine if this is the problem
2. End of suction pipe not submerged deep enough in liquid
3.
Suction lift is too great or the suction piping is too small
4. Liquid is vaporizing in the suction line before it gets to the
pump
if after consideration of these points it still does not pump,
suggest you review again all points given under STArT up;
read through Troubleshooting in this manual and try again. if it
still does not pump, contact your viking representative.