Viking Pump TSM343.3: Vi-Corr Pumps - Manual (Page 17)

SECTION TSM 343.3 ISSUE F PAGE 17 OF 20
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 promote 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 diameter pipe with short and straight runs.
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.
9. DO use piping, hose and fittings rated for maximum system pressure.
10. DO check to make sure all guards are in place.