Winston Engineering Case Study 8

Case Study 8

Incident: Pump running at abnormal high ampere 7.3A

Remedy:

1. Remove the submersible pump out of water, place on ground and check the pump rotation. Technician discovered pump was in wrong direction. Swap phase cable and change for correct rotation according to pump casing arrow indication.

2. Place the submersible pump back to pond, check the pump running ampere, 3.7A (same as pump nameplate)

Possible Cause Analysis:

A centrifugal pump uses a spinning "impeller," which normally has backward-swept blades that directly push water outward.

Rectification:

1. During this type of DAB submersible installation, do check and make sure it's in correct rotation.

2. We tend to think that if pump operated in wrong rotation there will be low discharge pressure and low ampere. However, based on this incident, impeller with wrong rotation results in higher discharge pressure (compare to correct rotation) and higher ampere.

3. The semi open impeller of this model has above higher discharge pressure and higher ampere issue if operate in wrong rotation.

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