ASME UW-12 question 1

[fjodor]

I have a question ragarding UW-12 when head and shell are seamless. If I understood correctly joint efficiency E=1 when spot radiography requirements of UW-11a5b are met.
But if I preform no radiography or do not met above requirement E=0,85?
Also if one uses weld type no. 3,4,5 or 6 E=0,85?

 

[GenB]

Awsign efficiency to long and circ joints separately. I think that you are confused a little

 

[fjodor]

I'm talking about circumferental weld between seamles pipe (shell) and seamless head

 

[jimmy23]

UW-12(d) only applies to circumferential stress (long seams) and head thickness calculations. It cannot be applied to the joint you are referring (cat B, longitudinal stress). For this you must use the table. Check the notes as well, as the longitudinal stress probably will not govern.

 

[fjodor]

SO basically use the table, depending on E and weld type see what scope of testing you need?

 

[SnTMan]

fjodor, your interpretation in your original post is correct.

For seamless sections, Type 1 joint, E = 1.0 for circumferential stress when UW-11 (a)(5)(b) is met.

E = 0.85 when UW-11(a)(5)(b) is not met or for Types 3, 4, 5, 6.

As UW-12 (d) states.

Regards,

Mike