9 Checklist for Locating Trouble
9.1 Check List for Locating Trouble
9.1.1 Insufficient capacity
1.
Pump not primed, insure sump level is above casing.
2.
Speed too low.
3.
Total head higher than pump rating.
4.
Suction lift too great or insufficient NPSH of system.
5.
Impeller passages partially blocked.
6.
Suction line partially blocked.
7.
Wrong direction of rotation.
8.
Mechanical defects: impeller worn or damaged; defective gasket causing leakage.
9.1.2 Insufficient pressure
1.
Speed too low.
2.
Air in slurry.
3.
Wrong direction of rotation.
4.
Mechanical defects: impeller worn or damaged; defective gasket causing leakage.
9.1.3 Motor overload
1.
Speed too high.
2.
Total head lower than pump rating (pump will attempt to pump too much water).
3.
Slurry being pumped has higher specific gravity than that for which pump is rated.
4.
Mechanical defects: shaft bent; worn bearings; worn impeller or other water end parts.
5.
Slurry locked in and around impeller.
6.
Pump running at high horsepower area of the pump curve (off of design point).
7.
Rubbing or binding of rotating elements.
9.1.4 Pump vibration
1.
Foundation not sufficiently rigid.
2.
Impeller partially blocked causing unbalance.
3.
Misalignment.
4.
Mechanical defects: shaft bent, worn bearings, impeller worn.
9.1.5 Leak at column pipe
1.
Worn impeller.
2.
Discharge pressure greater than pump rating.
3.
Worn bearings.
4.
Speed too low.
5.
Deteriorated o-rings or gaskets.
6.
Poor pipe joints.
9 Checklist for Locating Trouble
34
Model VJC Installation, Operation, and Maintenance Manual
Summary of Contents for VJC
Page 1: ...Installation Operation and Maintenance Manual Model VJC ...
Page 2: ......
