Following a bearing failure of the in-service motor the End User reached out to TDC Parsons Peebles to review the quickest options to return the compressor motor to service. Due to location and complex lifting requirements the removal from site was going to take considerable time.

The customer held a spare motor which had been held in storage for ~10 years however preservation and missing parts meant it was not suitable to be used. As this was not a Parsons Peebles machine, we reached out to the original OEM for confirmation the designs and dimensions of both motors would allow for parts to be interchangeable.

The spare motor was received for a full inspection, on receipt several issues were noted, and a plan was agreed as to the best way forward:

• Utilise the spare rotor – rework was required to all journals

• Utilise the spare bearings – re-metalling to original dimensions

• Utilise the spare external cover work

• Utilise the spare cooler and heat exchanger

Once the scope had been agreed the spare rotor had all journals repaired to the original dimensions and tolerances. The failed motor was then received into our works where it was dismantled, and the stator cleaned and stoved prior to a full suite of electrical tests. The motor was fully overhauled and utilising parts from both our engineers successfully assembled the motor ready for test. Given the location offshore and the requirement to be fully comfortable of its performance TDC PP included a full suite of testing including initial static electrical tests including auxiliaries, cooler pressure test and light run to check pedestal and shaft vibration. A Load test was also offered where the motor was coupled to our 10,000hp epicyclic gearboxes to provide full confidence in its performance and reliability under load conditions.