Urgent repair to maintain process continuity
CASE STUDY: Effluent Pump Repair — Major Industrial Processing Facility
Industry: Industrial / Food & Beverage Processing Services: Workshop, Electrical Testing, Mechanical Repair, Machining, Dynamic Balancing Equipment: Submersible Effluent Pump — Motor, Mechanical Seals, Rotor Assembly
The Situation
An effluent pump at a major processing facility began tripping on an electrical fault. With effluent processing a non-negotiable part of plant operations, getting the unit back online quickly was essential to maintaining process continuity.
The Challenge
An electrical trip can have multiple causes, and in a pump of this type — where the motor and hydraulic end share a common assembly — an electrical fault often signals mechanical problems too. A complete diagnosis was needed before the repair scope could be defined.
What Qualtex Did
The unit was removed from site and transported to the Qualtex workshop. Electrical testing confirmed a fault with the main supply cables, but disassembly revealed the full picture: the terminal block had also developed a fault, and the mechanical seals had reached the end of their service life, allowing fluid to leak into the motor windings.
Cable testing pinpointed the fault to the glands. Rather than replacing the full cable run — which would have extended the outage and increased cost — technicians removed the damaged section and re-terminated into a new termination block. Post-repair electrical testing confirmed insulation resistance between each phase and to earth had returned to acceptable levels. The motor stator was washed and oven dried to improve the dielectric absorption ratio (DAR).
In the machine shop, a bearing surface on the rotor shaft was found to be out of tolerance and was machined back to specification. The rotor assembly was dynamically balanced, new bearings and mechanical seals were fitted, and the motor and pump were fully reassembled. A test run verified the integrity of the repair before the unit was returned to site.
The Outcome
By diagnosing and resolving every fault — electrical, mechanical, and sealing — in a single workshop visit, and by using locally available resources to carry out the work efficiently, the outage was kept to a minimum. The pump was returned to service in sound condition, with the underlying causes of the failure fully addressed rather than the presenting symptom alone.
