Viking Pump TSM343.3: Vi-Corr Pumps - Manual (Page 16)

SECTION TSM 343.3 ISSUE F PAGE 16 OF 20
Pressure gauge - Discharge Port
High reading would indicate:
1. High viscosity and small diameter and/or lengthy discharge line.
2. The strainer or filter is plugged.
3. The pressure relief valve is set too high.
4. Valve in the discharge line partially closed.
5. Line may be partially plugged from build up on the inside of the pump, solidified product
or foreign object.
6. Liquid in the pipe is not up to temperature.
Low reading would indicate:
1. Pressure relief valve may be set too low.
2. Pressure relief valve poppet is not seating properly.
3. The bypass around the pump is partially open.
4. Pump is damaged or worn.
5. The pump has too much internal clearance.
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
Some of the following may also help pinpoint the problem.
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.
Fluttery, jumping or erratic reading would indicate:
1. The liquid is vaporizing.
2. Liquid is coming in to the pump in slugs, possibly an air leak or insufficient liquid above
the end of the suction pipe.
3. Vibration from cavitation, misalignment, or damaged parts.