Viking Pump TSM343.1: Vi-Corr Mag Drive - Manual (Page 11)

TSM 343.1 ISSUE D PAGE 11 OF 13
4. Remove any foreign particles from the outside of the
canister then slide the canister into coupling bracket. USE
EXTREME CAUTION, DO NOT PLACE FINGERS NEAR
MOUNTING SURFACE NEAR MOUNTING SURFACE
TO AVOID PINCHING. See Figure 6.
Finish assembly by securing pump to bracket. See Figure 21.
Make sure the power is disconnected, check to see if the
pump turns over freely by spinning the fan motor blades or
bearing carrier shaft, which should turn freely.
TROUBLE SHOOTING
A Viking pump that is properly installed and maintained will
give long satisfactory performance.
If trouble does develop, one of the first steps toward finding
the difficulty is to in stall a vacuum gauge in the suction line
and a pressure gauge in the discharge line. Readings on
these gauges often give a clue on where to start looking for
trouble.
Vacuum Gauge - Suction Port
High vacuum reading would indicate:
1. Suction line blocked, valve closed, strainer plugged or
pinched suction hole.
2. Suction line too small.
3. Liquid too viscous to flow through piping.
4. Lift required too high.
Low reading would indicate:
1. Air leak in suction lane
2. End of pipe not in liquid
3. Pump is worn.
4. Pump is dry and should be primed.
fluttery, jumping or erratic reading would indicate:
1. Liquid vaporising.
2. Liquid coming to pump in slugs possibly an air leak or
insufficient liquid above the end of the suction pipe.
3. Vibrating from cavitation, misalignment, or damaged
parts.
4. Decoupling of magnetic coupling, possibly due to
pressure spikes.
Pressure Gauge - Discharge Port
High reading would indicate:
1. High viscosity and small diameter and/or lengthy
discharge line.
2. Strainer or filter plugged.
3. Pressure relief valve split too high.
4. Valve in discharge line partially closed.
5. Line partially plugged from build up on inside of pump,
solidified product or foreign object.
6. Liquid in pipe not up to temperature.
Low reading would indicate:
1. Pressure relief valve set too low.
2. Pressure relief valve poppet not seating properly.
3. Pump assembly bolts not torqued to specifications.
4. Bypass around pump partially open.
5. Too much extra clearance.
6. Pump damaged or worn.
7. Coupling not staying coupled.
fluttery, jumping or erratic reading would indicate:
1. Cavitation.
2. Liquid coming to pump in slugs.
3. Air leak in suction lane.
4. Vibrating from misalignment or mechanical problems.
Miscellaneous
Some of the following may also pinpoint the problem;
Pump does not pump:
1. Lost its prime from air leak or low level in tank.
2. Suction lift too high.
3. Rotating in wrong direction.
4. Motor does not come up to speed.
5. Suction and discharge valves not open.
6. Strainer clogged.
7. Bypass valve open, pressure relief valve set too low or
pressure relief valve pocket stuck open.
Pump 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.
9. Temperature changes either in the liquid or the
environment.
10.Magnetic coupling is decoupling. Change in application
(temperature, pressure, viscosity, etc.) may require
additional torque beyond coupling capabilities.
Pump starts, than looses its prime:
1. Supply tank empty.
2. Liquid vaporising in the suction line.
3. Air leak or air pockets in the suction line.
4. Pump is worn out.
PAGE 11 Of 13 ISSUE C SECTION TSM 343.1
fIGURE 21
RP-80514 - MD-A8