Selective Plating for the Power Generation industry

Power Generation

Power Generation

SIFCO ASC serves the world’s leading players in the power generation industry.

There are numerous operational and maintenance challenges facing the power generation industry, such as component wear, corrosion, fretting and conductivity. The SIFCO Process® includes a full range of electroplated deposits that meet the demanding engineering requirements for turbine applications.

See our video – The SIFCO Process for the Power Generation Industry

Typical applications for SIFCO ASC in this sector include the silver plating of palm assemblies, damper windings, copper wedges and strips, and coatings of shafts and engine components.

Typical Applications

  • Lowering electrical contact resistance
  • Improving wear resistance
  • Improving corrosion resistance
  • Pre-braze coatings
  • Anti-galling
  • Increasing surface hardness

Power Generation examples

Our portable process can be used to repair turbine components, bus bars, switchgear, diesel engine components, valves, generators, nuclear components and containment vessels. This can be done either in the workshop or in any environment where the component may be located.

BUS BARS: Lower electrical contact resistance.
CONTAINMENT VESSELS: Touch up electroless nickel coatings.
DIESEL ENGINES: Resize turbocharger bearing journals. Restore sleeve seats. Repair crankshaft and camshaft bearing diameters. Salvage bearing saddles.
GENERATORS: Repair bearing housings, rotor journals and commutators.
NUCLEAR COMPONENTS: Repair circular pump rotor air seal areas. Apply optical coating to fuel bundle shuttles. Hardcoat to resize bores of hydraulic stud tighteners. Restore seal areas on air lock flanges. Etch hot spots to remove alpha-radiating ferric flock.
TURBINES: Resize turbine shaft couplings, steering diameters, bearing journals, and turbine wheels. Repair turbine casing steam cuts. Apply pre-braze coatings to turbine blades and wheels.
VALVES: Repair defects in seat areas of gate, disc and needle valves. Restore worn packing areas on valve stems.

Case History

A personnel air lock head ring (flange) was plated with 0.040″ thickness of copper and hand worked to ensure a good seal with the O-ring and the mating part. It was then capped with 0.004″ thickness of nickel.

Bores on an aluminium hydraulic stud tightener were hardcoat anodised with a coating thickness of 0.002″ for dimensional restoration and to provide a more durable surface.

Two faces on the outside diameter, the vane area, of a low pressure steam turbine disc were repaired with a 0.003″ thick deposit of nickel. This 3 ton component was plated on site, in a horizontal position.

Collector rings from a generator armature were coated 0.002″ thick with non-cyanide silver to replace defective tank plated silver.
Industry Specific Applications – Power Generation & Distribution – Bus Bars – On-Site Silver Plating

Optimising current flow is a primary concern for the Electric Power Industry, especially in the transmission and distribution process. One key ingredient is providing and maintaining stable, conductive joints.

Field experience and laboratory studies have shown that this is especially true in the case of bus bars. Plated bus bars out-perform non-plated bus bars since they provide stable contact resistance and a low maximum operating temperature that increases the service life of the bus joint. Selective plating provides a simple, cost effective upgrade and repair solution for on-site silver plating of copper and aluminium bus systems.

Wind Turbine Application

With specially designed, portable machining equipment and plating technology, SIFCO ASC can repair damaged bearing journals and slip rings while in situ. We return your valuable generator equipment to its original tolerances and specifications without the costly removal and other expenses associated with traditional repair processes. The SIFCO Process also eliminates the major delays associated with disassembly and shipping which minimises your downtime.

Wind Turbine Selective PlatingThis photograph shows how the slip rings on a wind turbine were repaired in place. Three layers of copper were plated to resize the worn diameters and each layer was approximately 0.015″ thick. After dressing the plated copper deposit, a 0.005″ thick layer of silver was plated to improve conductivity.