Developing repair scope for rotating machinery NC-AWWA Spring Symposium 2018 Asheville, NC Developing repair scope for rotating machinery Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Benefits of having a firm repair scope Create a level playing field for all involved Eliminate the “Worst Case Scenario” approach Effectively manage contractors and service centers Insure you are getting the proper level of work done. Create an economic plan for decision making Once you determine scope, you can determine which equipment you will not repair Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Considerations in developing a repair scope Cost and scope (Can we have too much scope?) Equipment Efficiency Lead time (both repair and replacement) Age of Asset vs. Expected Life Planned upcoming system replacement Availability of parts/obsolescence Footprint/Piping pattern of replacement unit Local repair capabilities Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Repair scope – Electric Motors Cost of Repair vs. new – The 60% rule What is a standard recondition Wash and Bake windings Test Windings Micrometer check all machine fits – Housings AND journals Rewind Class H Insulation Materials Inverter Rated Magnet Wire Correct number of leads Are the leads lugged Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Repair scope – Electric Motors - Continued Testing Core Loss tests before and after wind Rotor Bar test Test Run Load Test Additional Repair Dynamic Balancing Removal/Installation Alignment … Laser? Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Repair scope – Electric Motors - Continued Process Motor burnout temp Materials stored in climate control Winding in clean room Document machine fits Provide test results Root Cause failure analysis Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Repair scope - Mechanical Will you repair or replace shafts Shaft stubs acceptable or no? Method of repair Knurl Sleeve Weld up and Turn Metallize Done in house or contracted out? Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Other rotating equipment – Pumps, Gearboxes, Blowers Parts - OEM or Aftermarket (Aftermarket may be the same Balancing of rotating assemblies Recording of tolerances Wear ring and efficiency ring Gear Lash in gearboxes Blower wheels and housing in Regenerative Blowers Stator/Rotor clearance in lobe style blowers/prog cavity pumps Post repair seal testing Ship dry or with oil Pickup and Delivery incouded Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com
Summary - Questions Level Playing Field Helps you make repair/replace decision Manage and evaluate providers Make sure you are getting exactly what you want. Questions? Tim Hebert A&W Electric, Inc. (704) 363-3144 tim@aandwelectric.com