S.T. Cotter Turbine Services, Inc
2167 196th Street East, Clearwater, , Minnesota, United States

Welcome to S.T. Cotter Turbine Services, Inc.

Optimize your steam and gas turbines with turnkey precision rotating equipment service. S.T. Cotter Turbine Services, Inc. provides service for planned maintenance, emergent outages and balance of plant in refineries, power plants, paper mills and ethanol plants.

We consistently exceed customer expectations for a few simple reasons:

• Safety and quality are always our top priorities
• Our field personnel have extensive safety training
• Multiple unit experience helps streamline every project

Industrial Maintenance

From conveyors, to industrial material pump maintenance, line shaft turbines, we have the experience and technical capabilities to perform any project.

Process Services

Pumps 
Conveyors 
Technical Direction
Tooling Expertise
Industrial Steam Turbines
Replacements
Labor Supply Services

Combustion Turbines

Combustion turbine repair and services are one of our core business for S.T. Cotter Turbine Services, Inc. You can count on us to know all gas turbine systems and their leading manufacturers informational letters and alerts. Our gas turbine supervisors have experience with the leading domestic and European manufacturers.

Some of the services we provide for combustion turbines:

Generator Services
Technical Direction
Models Serviced
Tool Sets
Tooling Specifics

Combustion Turbines: Generator Services

Field Services: As a complete turnkey service provider, we understand that customers demand a complete solution. Not only do we offer technical direction and labor and turbine repairs, we also offer a full line of generator services, including rewinds, re-wedges, electrical testing, excitation upgrades and electrical diagnostics as well as Co2 blasting.

Stator Services: S.T. Cotter can offer complete stator services from a visual inspection and testing by experienced personnel to a complete rewind. S.T. Cotter provides all the standard electrical and mechanical testing and inspections plus EL-CID, loop test and end winding stiffness ("Bump") testing and analysis High Potential - commonly referred to as Hi-Pot testing.

Insulation Resistance

DC Resistance

EL CID - Electromagnetic Core Imperfection Detection testing is used to detect insulation breakdown between the laminated stator core plates in generators, exciters and large electric motors. Rotor Shorted Turn
Stator Wedge Tightness
Mechanical Resonance
Leak Testing
Winding & Iinsulation - Inspection & Repair
Core - Inspection, Repair, Retightening
Re-Wedging
Frame & Mechanical - Inspection & Repair
H2 Seal Repair
Field Work
On-Site Stator Restack Rewind Capability
Exciter Services: S.T. Cotter personnel have extensive experience with brushless exciter design, manufacture, maintenance and testing. Our knowledge gives us the ability to repair or rebuild components to improve exciter performance. S.T. Cotter refurbishment program includes a complete disassembly of all removable components, testing to identify the status of each electrical component and the ability to replace components. We offer re-banding services and complete rewinds of the stator and rotor winding assemblies plus PMG rewinds. All these services extend the life of the exciters and improve their performance. Inspection, testing and replacement of diodes, fuses and diode modules.

Inspection, testing and armature core repair
Inspection, testing and armature winding repair
Inspection, testing and diode wheel forging repair
Reassembly and alignment of the exciter rotor
Frame & Mechanical - Inspection & Repair
H2 Seal Repair
Field Work
On-Site Stator Restack Reqind Capability