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Hello all, which part of ASME is

Hello all, which part of ASME is

Hello all, which part of ASME is

(OP)
Hello all,

which part of ASME is talking about longitudinal crack on a boiler tube. We got a 4-5 inches crack on down comers side and I need to follow ASME code to repair that. Your advice is highly appreciated.

Thanks

RE: Hello all, which part of ASME is

ASME Code is not a repair code, it is a construction code so no specific guidance is provided for in-service repairs.

For in-service repairs of boilers you need to folow the National Board Inspection Code (NB-23 publication).

If this is a waterwall tube and yuo have an axial crack, I would replace the tube section with a dutchman (new tube) butt welded on each end to the existing tube away from the damage.

Use a qualified welding procedure based on material, and perform a post repair non-destructive test (x-ray) or other surface NDT.

RE: Hello all, which part of ASME is

Also, removing the failed tube section for a dutchman repair will allow you to determine what caused the axial crack. I would bet it is either corrosion fatigue crack propagation or short term overheat (axial thin-lipped split).

RE: Hello all, which part of ASME is

(OP)
thanks metengr

RE: Hello all, which part of ASME is

Can you tell us more about this watertube boiler such as manufacturer, type, year build, MAWP, heating tube and superheater surface areas. .

RE: Hello all, which part of ASME is

(OP)
It's a 200 klb/hr A type CLEAVER BROOKS boiler with dry saturated steam of 450 psi. almost 20 years old.

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