Viking Pump TSM340.1: SG-10, SG-14 - Manual (Page 10)

SECTION TSM 340.1 ISSUE D PAGE 10 OF 11
Fluttery, jumping or erratic reading would indicate:
1. Cavitation.
2. Liquid is coming to the pump in slugs.
3. Air leak in the suction line.
4. Vibrating from misalignment or mechanical problems.
MISCELLANEOUS:
Pump does not pump:
1. The pump has lost its prime from air leak or low level in
tank.
2. The suction lift is too high.
3. Rotating in the wrong direction.
4. The motor does not come up to speed.
5. The strainer is clogged.
6. The bypass valve is open, pressure relief valve set too
low or pressure relief valve poppet stuck open.
7. The pump is worn out.
8. Any changes in liquid, system or operation that would
help explain the trouble, e.g. new liquid, additional lines
or process changes.
Pump starts, then loses its prime:
1. The supply tank is empty.
2. The liquid is vaporizing in the suction line.
3. There is an air leak or air pockets in the suction line.
4. The pump is worn out.
Pump is noisy:
1. The pump is cavitating (liquid vaporizing in suction line)
or being starved (heavy liquid cannot get to pump fast
enough). Increase the suction pipe size and/or reduce
the length, or decrease the pump speed. If the pump is
above the liquid, raise the liquid level closer to the center
line of the inlet port. If the liquid is above the pump,
increase the head of the liquid.
2. Check alignment.
3. Anchor the base or piping to eliminate vibration.
Pump not delivering up to capacity:
1. The pump is starving or cavitating – see Pump is noisy,
item 1.
2. The strainer partially clogged.
3. Air leak somewhere in the suction line.
4. Running too slow. Is the motor the correct speed and
wired up correctly?
5. Pressure relief valve is set too low, stuck open or has
damaged poppet seat.
6. The bypass line around the pump partially opened.
7. The pump is worn out.
Pump takes too much power (stalls motor):
1. Liquid is more viscous than the is unit sized to handle.
2. The system pressure relief valve set too high.
3. The pump is misaligned.
DO’S AND DON’TS:
Do’s and Don’ts for installation, operation and maintenance
of Viking pumps to assure safe, long, trouble free operation.
Installation:
1. DO install the pump as close to supply tank as possible.
2. DO leave working space around the pumping unit.
3. DO use large, short and straight suction port.
4. DO install a strainer in the suction line.
5. DO a double check of alignment after unit is mounted
and piping is hooked up.
6. DO provide pressure relief valve for discharge side of
pump.
7. DO check for proper rotation.
8. DO use piping, hose and fittings rated for maximum
system pressure.
Operation:
1. DON’T run the pump at speeds faster than 1800 RPM.
2. DON’T allow the pump to develop pressure higher than
those shown in catalog at that size.
3. DON’T operate pumps at temperatures above or below
limits shown in catalog for model.
4. DON’T operate unit without all guards in place.
5. DON’T operate pump without pressure relief valve in
discharge piping; be sure valve is mounted and set
correctly.
6. DON’T stick fingers in ports of pump!!! Fingers may be
pinched between gears.
7. DON’T work on the pump unless driver has been “locked
out” so it cannot be started while work is being done on
the pump.
Maintenance:
1. DO record pump model number and serial number and
file for further use.
2. DO have spare parts, pump or stand by units available,
particularly if pump is essential part of key operation
process.
3. DO obtain, read and keep all maintenance instructions
furnished with this pump.
IMPORTANT:
In ordering parts for pressure relief valve, always give
model number and serial number of pump as it appears on
nameplate and name of part wanted. When ordering springs,
be sure to give pressure setting desired.