Mark Wilmer Pumping Plant

Unit 1 Overhaul

Scope of Work

• Upgrade Impeller to New Specification• Replace Upper and Lower Wear Rings• Refurbish Motor Stator Insulation• Repair Motor Rotor Pole Braces• Rebuild Unit Discharge Valve• Blast and Recoat Pump Diffuser• Blast and Recoat Pump Pit Liner• Recalibrate all Unit Instrumentation

Unit 4 Disassembled

Stator Winding prior to clean and epoxy coating

Machine Lower Wear Ring

Blast and Coat Pump Diffuser

Pump Diffuser Ring

Head Cover Bolts

13.8 KV Stator Winding epoxy coating to extend insulation life and

improve High Voltage DC test results

Machine major components

Pump Shaft 25,000 LBS

Repaired ImpellerImpeller 14,900 LBS

Head CoverImpeller

Rotor 231,000 LBS

New Pump Impeller

Rebuilt Discharge ValveRebuilt 54” Discharge Valve

Pump Shaft

Impeller Bolts holes

Preliminary Schedule• Unit disassembly to begin June 18th• Ship Impeller by July 9• Remove and rebuild discharge valve • Blast and coat the pump pit• Machine pump pit wear rings• Clean and coat motor stator and rotor • Unit assembly to begin by October 1• Unit assembly complete by November 12• Complete Unit Start-up Check list • Heat Run last week of November• Release for Operations by December 1