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Gibbons Engineering Group has returned two ventilation fans to service following an overhaul for Bairds in Witham. The work combined bearing replacement, inspection, electrical testing, refurbishment and recommissioning, and led to a request for the same process on another two fans.
Removal and workshop overhaul
Following isolation by the customer’s site engineer, Gibbons disconnected the fans and made the supply leads safe in junction boxes. The associated attenuator was removed to provide access, and the opening was temporarily secured while the equipment was away.
At the workshop, both fans were stripped, cleaned and inspected. The rotors were removed and four new 6207 RS bearings were installed, with two bearings fitted to each rotor.
The motor stators underwent insulation resistance, resistance balance, flash and choke testing. Both passed the required tests and were found to be in good condition.
The fans were reassembled and relevant components refurbished and painted before being prepared for their return to site.
Reinstallation and further work
Once back at Bairds, the fans were lifted into position, the flanges were sealed and the attenuator was refitted and secured. The electrical connections were reinstated and each fan was test run, including a check of its direction of rotation, before handover.
Bairds subsequently asked Gibbons to overhaul a further two fans. Those units were isolated, disconnected and removed for workshop attention, with the openings temporarily secured using the same approach.
The case study shows the stages involved in restoring industrial ventilation equipment, from assessment and bearing replacement through to testing and return to service. Gibbons provides fan repairs, motor overhauls, bearing replacement, electrical testing and equipment refurbishment.
Source: Gibbons Engineering Group
For more information on Fan Overhaul and Replacement Bearings at Bairds, Witham talk to Gibbons Engineering Group Ltd