All Member Open Forum

Hello, 

In an article published by the Electrical Insulation Conference (IEC) in 2015 (in collaboration with Howard Penrose and Nancy Frost) titled "Aging Electric Machines - Repair, Replace, or Uprate", there is an RCFA decision tree that I believe my organization could and should leverage.

One of the decisions is "Replacement Available at XX% of new?". 

What is the standard for your companies? 

Thanks, 

Jarrett Adams

Reliability Engineer

Shaw Industries

------------------------------
Jarrett Adams EIT
Reliability Engineer
Shaw Industries Group, Inc
Dalton GA
------------------------------

Howard is typically on this forum, so perhaps best he answer.  But I'm thinking it has to be situational?  The cost of the replacement compared to the other possible actions.  The cost comparison should at least include the cost of the action to the motor, but also risk of downtime, risk of damages, and cost of storing parts (if stored).   I'm thinking that any decision has to be put into operational context and therefore XX% is probably different in each case?

------------------------------
Torbjorn Idhammar
President & CEO
IDCON, Inc.
http://www.idcon.com
Raleigh NC
------------------------------

Jarrett

There was a rule of thumb that called for 75% of new if it was a smaller standard or energy efficient motor (<600V) when moving to a premium efficient; 80-90% when premium efficient to premium efficient.  Of course, it also depends on if a replacement motor is available and the severity of the damage to the original motor.

You can find some additional guidance in the attached US DOE manual (public document) that we updated in 2010 (the original 1990s Motor Challenge team).  It is presently still up to date including a motor repair shop checklist that we made sure was later included IEEE 1068 (a version of the checklist) and remains part of the EASA repair shop certification program.

I'm also including the other US DOE 'Energy Management for Motor Driven Systems' that includes most of the best practice recommendations from the team with a few updates.  Both of these are also available on the US Department of Energy website and 'Energy Management' is available on the EASA website, but the locations move frequently - so here they are.  As mentioned previously, both are public documents and can be shared.

------------------------------
Howard W Penrose, Ph.D., CMRP
Random Past SMRP Chair (2018), 2019+ Govt Relations Smart Grid, Infrastructure and Cybersecurity Working Group Chair,
Chair Technical Standards wind, solar, energy storage, American Clean Power (formerly AWEA), and
President
MotorDoc LLC
Lombard, Illinois
------------------------------

Thanks for the reply and resources! 

------------------------------
Jarrett Adams EIT
Reliability Engineer
Shaw Industries Group, Inc
Dalton GA
------------------------------

Original Message:
Sent: 07-21-2023 07:32 AM
From: Howard Penrose
Subject: Enterprise standard for Repair vs. Replace (% of new)

Jarrett

There was a rule of thumb that called for 75% of new if it was a smaller standard or energy efficient motor (<600V) when moving to a premium efficient; 80-90% when premium efficient to premium efficient.  Of course, it also depends on if a replacement motor is available and the severity of the damage to the original motor.

You can find some additional guidance in the attached US DOE manual (public document) that we updated in 2010 (the original 1990s Motor Challenge team).  It is presently still up to date including a motor repair shop checklist that we made sure was later included IEEE 1068 (a version of the checklist) and remains part of the EASA repair shop certification program.

I'm also including the other US DOE 'Energy Management for Motor Driven Systems' that includes most of the best practice recommendations from the team with a few updates.  Both of these are also available on the US Department of Energy website and 'Energy Management' is available on the EASA website, but the locations move frequently - so here they are.  As mentioned previously, both are public documents and can be shared.

------------------------------
Howard W Penrose, Ph.D., CMRP
Random Past SMRP Chair (2018), 2019+ Govt Relations Smart Grid, Infrastructure and Cybersecurity Working Group Chair,
Chair Technical Standards wind, solar, energy storage, American Clean Power (formerly AWEA), and
President
MotorDoc LLC
Lombard, Illinois
------------------------------