Detail


Turbine half joint Leak Sealing

A challenging Leak Sealing problem

  • The two halves of a turbine casing are held together by an array of studs and nuts and may then be considered as akin to a very large flange.
  • Typically, there is no gasket and no raised face.
  • The seal is formed by the intimate contact of the two half-joint faces which are machined flat to a very tight tolerance.
  • This arrangement presents a challenging leak sealing problem
    • There is nowhere to inject the compound

Furmanite however, do have a solution.

Turbine half Joints

Leak Sealing Methods:

A variety of leak sealing methods may be applied, sometimes in combination with one another

  • Injection points may be drilled into each bolt hole in the vicinity of the leak
    • A low viscosity compound (easy flowing) can then be injected down the bolt holes at pressure
    • The compound will flow into any narrow gaps at the half joint, which may be sufficient to seal the leak path
  • Injection points may be drilled at an angle, to intersect the half joint between the bolt holes
    • Again, a low viscosity compound is injected at pressure with the intention that it flows out of the injection hole at the half joint to fill the leak paths
  • A plate may be fastened across the half joint in the region of the leak
    • The plate may be attached to the turbine by welding, or by drilling and tapping for an array of studs
    • The plate will have a recess into which compound is injected, with the intention that it flows into any gaps at the half joint

 


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