Viking Pump TSM1470: HI-LO Double Pumps - Manual (Page 5)

SECTION TSM 1470 ISSUE F PAGE 5 OF 8
BRACKET
SECTION
HIGH PRESSURE
LOW VOLUME
SECTION
SPACER
SECTION
SEQUENCE
VALVE
ADJUSTMENT
ASSEMBLY
CHECK
VALVE
SEQUENCE VALVE
SPOOL ASSEMBLY
HEAD
SECTION
LOW PRESSURE
HIGH VOLUME
SECTION
FIGURE 4
VIKING HI-LO PUMP
TERMIINOLOGY
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. The line is partially plugged from product build up on
the inside of the pump, solidified product or a foreign
object.
6. Liquid in the pipe is not up to temperature.
Low reading would indicate:
1. Pressure relief valve is set too low.
2. Pressure relief valve poppet is not seating properly.
3. Pump mounting capscrews are not torqued to
specifications (GP-04 and GP-05 Series 12-15 ft.-lbs.).
4. Pump assembly bolts are not torqued into specifications
(GP-07 Series 50-55 ft.-lbs.).
5. The pump check valve is stuck open or not seating
properly. See figure 4.
6. The pump is damaged or worn.
Fluttery, jumping or erratic reading would indicate:
1. Cavitation.
2. Liquid is coming to the pump in slugs.
3. An 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 an air leak or a low
level in the 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, the pressure relief valve set
too low or the pressure relief valve poppet is 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, than 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 the 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.