We received a phone call from a motor repair shop that had a power plant client that was under a unit wide shutdown due to a breakdown on a 1000 HP 394 RPM 4000v GE Vertical Solid Shaft Pump Motor. With a replacement motor 9 months out, and a completely destroyed, practically unrepairable original motor, they were asking - "Can you help?"
Lucky for this customer, we had a potential surplus motor in our inventory. Would this work? Below you will see some of the steps and comparisons that were taken to perform this evaluation.
Starting with the mechanical similarities, base diameter, shaft diameter and shaft length on the customer's motor were equal to the HECO motor. These aspects of the motor did not need to be adjusted.
We then looked at the Rabbit Fit or “AK” Dimension. The customer's AK was a 54” male and we had a 51” female, so we created a ring to match the male piece, allowing our motor to fit right onto the pump. Take a look at the picture below to see the difference in the AK.
The customer's 1000 HP motor pulled 146 Amps at full load. Our 1250 HP motor pulls 173 Amps at full load per name plate. At 1000 HP, HECO's motor was calculated to pull around 139 Amps at full load after the repair.
We then looked at the KVA codes to identify the locked rotor amps. The customer's motor was a code H and took in 1,024 Amps and the HECO motor was a code F pulling 1,010 Amps.
Both motors had 100 Ohm Pt. Winding RTDs. The customer had Bearing Thermocouples and we had 100 Ohm Bearing RTDs which we replaced with the equivalent Bearing TCs.
That completes this motor reconstruction case study. We were able to send out a fully refurbished surplus motor in order to get our customer back up and running - All in the matter of a few days versus multiple months!
Original Motor HECO's Replacement
HECO - All Systems Go
About the author:
Geoffrey Brewer is the Director of New Equipment Distribution at HECO - All Systems Go. Geoffrey lead HECO's team on replacing motors with new or surplus options. From NEMA T-Frame motors to large, custom Above NEMA frame motors, Geoffrey and his team lead the charge for HECO.