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UW-11(a)(5)(-b) Spot

UW-11(a)(5)(-b) Spot

Apologies for another UW-11(a)(5)(-b) post. All the threads on this website and other documentation I've read (such as Pastor's Pressure Points Newsletter) haven't quite covered my situation though.

I am reviewing the design of an existing VIII-1 vessel from the 2001 ed. It has the following RT & E details and is stamped RT-4:

Shell Long Joints
SPOT UW-11(b)
Head/Shell Joints
SPOT UW-11(a)(5)(-b)
Joints in Heads

E Factor
Shell Long Joints
Head/Shell Joints
Joints in Heads

All the examples I've seen discuss when the Category A long seams are either seamless or full RT. It seems to me that UW-12(d) is satisfied because the Category B welds have been spot radiographed as per UW-11(a)(5)(-b), even though the Category A welds haven't been Fully RT'd as per UW-11(a)(5).

Can I use E=1 in the UG-32 calculation for a 2:1 seamless head if spot RT was done on both the Category A and B (Table UW-12 Type 1) welds?

RE: UW-11(a)(5)(-b) Spot

RT of long seam is irrelevant to satisfy UW-12(d). Only UW-11(a)(5)(b) need be satisfied. In other words spot RT on Head to Shell Circ.

Looks on Long Seams, Spot on Circ Seams, + Spot for Head thickness (UW-11(a)(5)(b)). Must be RT-4 as you cannot have E=1 for head thickness with RT-3.

RE: UW-11(a)(5)(-b) Spot

I just noticed you have SPOT UW-11(a)(5)(b) under RT head/shell can't use the single shot for UW-12(d) to increase circ joint efficiency. You would need two spots.

RE: UW-11(a)(5)(-b) Spot

david339933, where does the two spots requirement come from? I neglected to say that the Diameter is 10' so each head to shell joint is less than 50ft as per UW-52.

edit: Or are you referring to UW-11(a)(5)(-b) where it says that the spot radiographs shall not be used to satisfy the spot radiography rules as applied to any other weld increment? i.e. one spot RT is required to satisfy UW-11(a)(5)(-b) and a second spot RT is required to satisfy the circ seam joint efficiency.

RE: UW-11(a)(5)(-b) Spot

This link also gives good information for my situation:

I had been thinking about the Category A weld mentioned in UW-12(d) as the long seam, but this link explains that I should consider an "imaginary" Category A weld in the seamless head instead. Which, therefore, lines up with david339933's post that RT of the long seam is irrelevant to UG-32 calculations.

RE: UW-11(a)(5)(-b) Spot

Yes, cannot be applied to any other weld increment. And yes, imaginary Cat. A in the head.

RE: UW-11(a)(5)(-b) Spot

Thanks david339933 and israr1!

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