September 29, 2005
Motor Diagnostic and Motor Health News September 28, 2005 Motor Management
- From the Editor
- Update on the Institute of Electrical Motor Diagnostics
- November Training in Australia
- AC Motor Testing Paper
- Developing a Motor Management Program Paper
- Question: Reconditioning a Flooded Motor
From the Editor
With the recent disasters in the South, a lot of information has been passed around concerning how to recondition rotating machinery that has been submerged in grey water. Unfortunately, much of this information is incorrect and can result in motor failure. In this newsletter, we will cover some of the key issues related to reconditioning flooded equipment.
The By-Law meeting for the Institute of Electrical Motor Diagnostics was held at the PdM-2005 conference on Sunday, September 18, 2005, in Atlanta, GA. The bylaws are accepted and membership fees set. See the information on IEMD below.
Sincerely,
The Editor
Update on the Institute of Electrical Motor Diagnostics
The By-Law meeting for IEMD was held on Sunday, September 18, 2005. During the meeting, chaired by the Interim Chair Vlad Djuric of Dofasco and Exectutive Director Howard W Penrose, Ph.D., the By-Laws were reviewed with only a few grammatical changes to the document and vendor and regular members defined. Following the presentation, discussion and vote, the bylaws were accepted and 2006 membership fees discussed and selected. Dr Penrose and Dave Humphrey, of Allison Transmission, presented information on IEMD Best Practices.
The selected membership program will be:
Individual Regular Member: $75 USD per year
Individual Supplier Member: $75 USD per year
Company Regular Member: $1,000 USD per year
Company Supplier Member: $1,000 USD per year
During 2006, companies and individuals will have the opportunity to become charter members:
Founding Individual Member: $150 USD + for 2006
Founding Company Member: $2,500 USD + for 2006
Supplier Members are members who are diagnostic equipment manufacturers, their sales organization, agents and representatives. The only restriction on Supplier Members is that they cannot serve on the Executive Committee, but can serve on the Board of Directors, and have some restrictions in the development of Best Practices.
Companies that have supported the development of IEMD, to date, include: T-Solutions, Inc., Success by Design, Cargill, Allied Services, Snell, General Motors, Dofasco, ALL-TEST Pro, PdMA, Framatome, Baker Instruments, and more.
Instructions on becoming a member of IEMD will be published by December, 2005, for calendar year 2006. For more information on IEMD, or to become a member for the remainder of 2005, please visit us on http://www.iemd.org.
November, 2005, Australia Training
Dr Penrose will be providing Motor Management and Classical RCM/Backfit RCM training in Australia from November 14-16, 2005. Space is limited.
The venue will be the Murray Bouburn Integrated Logistics Centre, Laverton North Melbourne, Victoria. The program is to be hosted by Reads Systems Pty, Ltd. Contact Clyde Volpe at
Information can be downloaded from http://www.motordiagnostics.com/presentations.htm
AC Motor Testing Paper
A white paper by Howard W Penrose, Ph.D. on the motor testing and predictive maintenance technologies covered in the upcoming IEEE standard “Guide for Induction Machinery Maintenance Testing and Failure Analysis.” This paper was presented at PdM-2005 in Atlanta, GA.
Download from the T-Solutions 2005 Technical Papers section: http://www.motordiagnostics.com/presentations.htm
Developing A Motor Management Program Paper
A white paper by Howard W Penrose, Ph.D. on developing a motor management program presented at PdM-2005 in Atlanta, GA.
Download from the T-Solutions 2005 Technical Papers section: http://www.motordiagnostics.com/presentations.htm
Question: Reconditioning a Flooded Motor
Believe it or not, pure or distilled water is not conductive. It is the contaminants that cause component and electrical degradation. So, with much that has happened in the Southern USA, most of the submerged electrical equipment was exposed to grey water. This is water that carries sewerage, chemicals, salt, decay and other contaminants that will reduce the electrical and mechanical reliability of your equipment.
What has happened to your electric motor:
1. The bearings have been exposed and will have started rusting;
2. The grease will be contaminated and may have separated;
3. Shaft, rotor and other rotating components have started rusting;
4. Contaminants have come into contact with the insulation system of the electrical conductors generating a condition that will degenerate or short if electrical energy is applied;
5. Stator mechanical components have rusted;
6. Let alone water in conduit, contacts, controls, etc.
Minimum necessary work:
If possible, send the motor in for reconditioning, clean, dip and bake. This involves steam cleaning, drying in an oven, bearings replaced, mechanical surfaces checked and polished, rotor dried in oven, varnish insulation added to the existing insulation system in order to restore it. Also, will identify problems that pre-existed.
With Babbitt bearings, the oil will be replaced and flushed. With ball and roller bearings, they will be replaced and grease replaced.
If you are not able to remove the motor from its location, disassemble the machine and remove the rotor. Clean the stator with clean water until all contaminants are removed. Set up an insulated enclosure around the motor and, using either high wattage spot lights or space heaters (keep in mind all safety rules and perform at your own risk), allow the temperature to approach 200 degrees F at a rate of 20 degrees F per hour (this prevents moisture from flashing to steam and damaging the insulation system). Perform insulation resistance readings periodically until the insulation resistance exceeds 500 MegOhms, or more.
For information on how to manage systems following flooding, contact . T-Solutions engineers have the experience necessary to assist you in coordinating your maintenance and reconditioning of facilities and machinery.
Sincerely,
The Editor
