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Boiler welded nozzle joint gap

Boiler welded nozzle joint gap

Boiler welded nozzle joint gap

(OP)
In B31.1, a 1/16" pre-weld gap is required in socket welded pipe joints between the pipe end and the shoulder of the fitting. thread178-25615 contains some discussion and even an explanation of the origin of this gap. However, I do not see any referral in the BPVC (sect. I or VIII) that addresses this gap or the residual stress said to remain if the two mating materials are bottomed out prior to welding (ref. Sect. I PW-16.1 figures (y) and (z)). Is this "residual stress" addressed in another section of the BPVC or is this weld design not subject to these stresses?

RE: Boiler welded nozzle joint gap

Use butt weld instead of socket

RE: Boiler welded nozzle joint gap

The figures you reference in ASME B&PV Code, Section I Part PW specify a 1/16" recess (dashed line in each figure (y) and (z) near the center of the weld prep).

RE: Boiler welded nozzle joint gap

Also forgot to mention that the welds depicted in these figures are considered partial penetration groove welds not socket welds.

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