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Cracks on IP nozzle ring segment

Cracks on IP nozzle ring segment

Cracks on IP nozzle ring segment

(OP)
Helo,

we found some cracks on nozzle ring segment. We are thinking what to do next - replacement of the nozzle or repair. What are yours suggestions?

Steam properties in front the nozzle: p=39[bar] t=520[C]

RE: Cracks on IP nozzle ring segment

I have seen this type of cracking. It is probably thermal fatigue and can be removed and weld repaired. Based on your photo this is indeed repairablew and does not require replacement.

RE: Cracks on IP nozzle ring segment

Balancing may be a problem after welded repair if it is not done by a qualified shop.

RE: Cracks on IP nozzle ring segment

Balancing? I believe this is a stationary component in a steam turbine. Agree, any weld repairs should be performed by a reputable large steam turbine repair shop.

RE: Cracks on IP nozzle ring segment

It looks like a rotating element.

RE: Cracks on IP nozzle ring segment

agree on repair.
what stage is this on?

RE: Cracks on IP nozzle ring segment

gierszi,

Based on your drawing, this nozzle assy looks to be a weldment.  And the cracks appear to be in one of the weld zones (specifically, right where the drawing specifies "R16").  Is this correct?

Terry

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