- Suction pipe, foot valve choked.
- Nominal diameter of suction line too small.
- Suction pipe not sufficiently submerge
- Too many bends in the suction line.
- Clearance around suction inlet not sufficient.
- Shut off Valve in the suction line in unfavourable Condition.
- Incorrect Layout of Suction Line.
- Valve in the suction line not fully open.
- Joints in the suction line not leak-proof.
- Air leaking through the Suction line & Stuffing Box.
- Suction lift too high.
- Suction head too low.
- Delivery liquid contains too much gas and/or alr.
- Delivery liquid too viscous.
- Insufficient venting.
- Number of revolutions too low.
- Incorrect direction of rotation.
- Impeller clogged.
- Impeller damaged.
- Casing Ring Worn out.
- Separation of crystals from the flow of pumping liquid
- Pump unsuitable for parallel operation.
- Type of pump unsuitable.
- Incorrect choice of pump for existing operating conditions.