AEMT - Association of Electrical and Mechanical Trades

26 July 2022
Ex N Motor Repair Minimises Cost and Disruption
HOUGHTON INTERNATIONAL was commissioned by Sabic, a Teesside-based petrochemical manufacturing company, to overhaul a 250kW, 3.3kV 4-pole Ex N GEC motor used in its Olefins 6 plant, the second largest liquid naphtha cracker plant in Europe.

Initially, the customer requested an inspection and report on the condition of the motor. The motor was received from the customer in poor condition externally with substantial corrosion across the entire surface of the unit, but upon dismantling, the internal components were found to be clean, with little ingress evident in the windings. It was suspected that this was the first time the motor had been dismantled since the original installation other than for routine bearing oil changes. 

Based on these findings, Houghton International recommended a complete in-depth overhaul of the motor at its IECEx certified facility by a team of experienced electromechanical engineers. The overhaul consisted of stripping down and steam cleaning the motor, stoving the stator windings and dynamically balancing the rotor to ISO grade 2.5. Being an Ex motor, the mandatory hazardous area checks were also carried out, with a full report produced at the end.

Remedial repairs to the covers were also carried out, and they were shot blasted and primed. A new sound baffle cover, cooling fan locking nut and new gaskets were manufactured to specification, and the entire unit was rebuilt. 

Following the rebuild, the motor underwent full testing, including a Baker test which ran a complete cycle of tests to ensure the integrity of all motor windings, an overall broad test run, and monitoring of vibration and all bearings before being returned to the customer's site. 

To begin with, the customer thought the existing motor was beyond economical repair because of the external damage, and a new motor would be required. However, the overhaul minimised the cost implications and disruption to the customer.

Furthermore, midway through the overhaul, the customer requested a much quicker turnaround. Houghton International was able to meet the customer's demands and deliver the overhauled motor on time, ahead of the original schedule.

In this story: HOUGHTON INTERNATIONAL
Ronnie Mitten Works, Shields Road, Newcastle Upon Tyne, NE6 2YL
01912 343000
More News from the AEMT
AEMT News
28 November 2022
The Winners of the 2022 AEMT Awards were announced during a Gala Presentation Ceremony in Coventry on Thursday 17th November. With a near record attendance, from right across the electrical and mechanical trades arena, the evening once again proved to be a wonderful evening of reward and celebration. Following the success of the previous four years, there was a good deal of excitement and anticipation ahead of the event with attendees eager to unite and engage with their colleagues and peers.
AEMT News
27 October 2022
As we hurtle towards the end of another turbulent year, energy costs and the Chancellor’s new ‘mini-budget’ are at the forefront of our minds this quarter. The repair and maintenance industry is perfectly positioned to help navigate the energy crisis. Meanwhile, there may be some benefits to take from the mini-budget, too, although we are yet to see what the full plan is.
Renew Mag
27 October 2022
The 5th annual Association of Electrical & Mechanical Trades (AEMT) awards returns to the West Midlands on the evening of Thursday, November 17. With a record number of submissions across the seven categories, this year’s programme has produced some exceptional entries from across the electro-mechanical arena.

Twitter Feed

News: Ex N Motor Repair Minimises Cost and Disruption