Teikoku USA | Chempump
Instruction Manual HE-12270 (0219)
25
Teikoku Type-F (Plan 1-SD) Pressurized Circulation ALP Multi-stage Pump
Problem
Probable Cause
Suggested Solution
Failure to deliver
required capacity
Pump not primed.
Reprime pump in accordance with
Section 3.2.3
Air leaks in suction piping.
Locate leaks and eliminate.
Motor not energized.
Check motor wiring. See
Section 2.3
and
Appx. N
Motor windings burnt-out or grounded.
Check electrical continuity of windings and is negative response, stator
assembly needs to be replaced.
Low suction head.
Correct suction side of system to ensure availability of design NPSH.
Discharge head too high.
Correct discharge side of system to ensure proper operating conditions.
Discharge valve closed or partially opened.
Open discharge valve until rated discharge pressure is obtained.
Impeller clogged.
Remove obstructions in impeller.
Wrong direction of rotation.
Reverse any two motor leads and check with phase sequence meter. See
Section 3.2.4
.
Damaged impeller
Impeller must be repaired or replaced.
Insufficient pressure
Pump not primed.
Reprime pump in accordance with
Section 3.2.3
Air leaks in suction piping.
Locate leaks and eliminate.
Motor not energized.
Check motor wiring. See
Section 2.3
Motor windings burnt-out or grounded.
Check electrical continuity of windings and is negative response, stator
assembly needs to be replaced.
Low suction head.
Correct suction side of system to ensure availability of design NPSH.
Discharge valve open too wide.
Close down discharge valve until rated discharge pressure is obtained.
Impeller clogged.
Remove obstructions in impeller.
Wrong direction of rotation.
Reverse any two motor leads
Damaged impeller
Impeller must be repaired or replaced.
Pump loses prime
after starting
Pump not properly primed at starting.
Reprime pump in accordance with
Section 3.2.3
.
Excessive change in suction vessel pressure. Locate source pressure fluctuations and correct as required.
Air or gas in liquid.
Locate source of gas or air entrainment and correct.
Low suction head.
Correct suction side of system to ensure availability of design NPSH.
Pump takes too much
power
Shaft bent.
Replace rotor assembly or straighten shaft if bend not too great.
Rotating element binds.
Replace bearings (see
Section 4
) as a result of excessive wear or check
for presence of foreign material in rotor chamber
Electrical short.
Check electrical continuity of all phases of the motor winding and
replace stator assembly if necessary
Pump vibrates
Foundation not sufficiently rigid.
Tighten all bolts on the pump base and base supporting structure.
Impeller partially clogged.
Remove obstructions in the impeller.
Shaft bent.
Replace rotor assembly or straighten shaft if bend is not too great.
Worn bearings.
Replace bearings (see
Section 4
). Check for presence of foreign material.
Rotating element rubbing stator liner.
Replace bearings (see
Section 4
), Check stator liner and rotor can for
wear. Repair and/or replace as required.
Motor running hot
Motor operating at overload condition.
Make sure pump is operating at design point and conditions specified
when purchased.
Pump is operating below minimum flow.
Increase flow through the pump.
Pump is running dry.
Check suction line for obstructions and closed valves
Reverse circulation line plugged.
Check reverse circulation line and orifice for blockage. Verify all valves in
reverse circulation line are 100% open.
Appx. E. Troubleshooting
