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On-site machining: power plant project list

 

turbine-assembly.jpg

When you consider the demands that turbine components in power plants are exposed to, it comes as no surprise that eventually many components will wear out and operate less efficiently. With steam turbine temperatures being of over 500°C, pressures of 4000psi and components rotating at speeds of over 3000rpm, the importance of a well-managed and robust maintenance programme cannot be overstated.  (Find out more about power plant maintenance strategies on our previous blog post).

What are the potential problems?

With turbines, the danger signals to watch out for include unusual vibration, noisy or unusually hot bearings, gland leakage, governor hunting, and lubrication problems such as low oil pressure, discoloured oil, or a broken lubricator.

Fixing the above can involve the use of on-site machining tools and to help you select the right machine for your next project. Below, we’ve listed machining applications and matched these to the relevant machine type from the Mirage range.

View the table below, of if you prefer you can download a Pdf version here.

POWER PLANT MAINTENANCE PROJECT

ON-SITE MACHINE TO USE

BEARING PEDESTALS
 

Machining the flat base of bearing pedestals

Milling Machine

Machining the inside diameter of bearing pedestals

Small Line Boring Machine

TURBINE CASINGS
 

Machining of surfaces in large diameter turbine casings (LP casing)

Large Line Boring Machine

or Mirage WB1500

Casing split line surfaces (steam turbines, LP, MP, HP)

Milling Machine

Creating sealing groves on turbine casings

Milling Machine

Machining of internal grooves in turbine casings

Flange Facing Machine

Machining surfaces for glands in the turbine casing

Small Line Boring Machine

TURBINE BLADES
 

Drill out turbine blade retainer pins

PD760 Pin Drill (bespoke product)

Cutting worn and damaged turbine blade tips

BLS760 Blade saw (bespoke product)

DIFFUSORS

 

Machining valve chambers (diffusors)

Small Line Boring Machine

Machining of large diffusors

Large Line Boring Machine

Machining of valve chambers (upper surface)

Flange Facing Machine

SHAFT MACHINING
 

Turbine shaft

Mid Shaft Turning Machine

Generator Shaft

Mid Shaft Turning Machine

COUPLINGS AND HOLE BORING
 

Wicket gate bearing hole boring

Large Line Boring Machine

Boring of generator couplings

Large Line Boring Machine

Machining of coupling holes

Small Line Boring Machine

HEAT EXCHANGERS
 

Face Machining

Flange Facing Machine

Back Face machining

Flange Facing machine (with Back Facing Kit)

Division Slot Machining

2 axis milling machine

HYDRO PLANTS
 

Machining of large turbine casings in hydro power plants (turbine face plate & seal ring machining)

Large Line Boring Machine

Stay vane machining

3 axis milling machine

Downhole repair (Machining turbine unit in-situ)

Flange Facing Machine

DIAPHRAGMS
 

Machining of the internal grooves for small diaphragms

Small Line Boring Machine

Machining for diaphragms

Flange Facing Machine

PIPELINES
 

Cutting pipes

Split Frame Clamshell Cutters

Pipe bevelling

Split Frame Clamshell Cutters

Counter-boring

Split Frame Clamshell Cutters

Flange removal

Split Frame Clamshell Cutters

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The above is just a selection of potential applications. If you need equipment for an on-site machining project get in touch with us here.

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