UCS-57 Radiographic Examination

[c8829]

Hello Everyone,
1).If Head(32mm) is Butt Welded(Full Penetration)with Shell(32mm), is this weld joint require FULL RADIOGRAPHY?
2).If Head(31mm) is Butt Welded(Full Penetration)with Shell(32mm), is this weld joint require FULL RADIOGRAPHY?

 

[SectionIX]

Depends upon the material, joint efficiency and service (read: lethal/non-lethal service).

 

[david339933]

For P1 material, No to both, as UCS-57 requires full radiographic examination ABOVE 32mm. Not inclusive of 32mm.

 

[SectionIX]

Agreed, but the joint efficiency and service may require full RT...

 

[c8829]

M.O.C is SA-516 Gr 60 and Joint efficiency is 0.7(Nil radiography) and Non-lethal service
Thanks for your reply.
SectionIX: how it depends on joint efficiency???
David339933: Does UW-40(f)(1) "Nominal Thickness" apply for Radiography.because both 32mm butt weld will increase weld joint more than 32 mm.????

 

[SectionIX]

c8829,

All things being relevant (non-lethal service, joint efficiency, and thickness) full radiography will not be mandatory. Joint efficiency is part of the calculation used to determine tmin, or minimum section thickness. A joint efficiency of 1.0 would require more radiographic testing that a lower joint efficiency factor. This is further explained in ASME Section VIII, Div. 1, UW-12.

See link below for further information.

http://www.nationalboard.org/PrintPage.aspx?NewsPageID=144

 

[david339933]

c8829,

Not sure I understand the question. UW-40(f)(1) - states the nominal thickness is the total depth of the weld EXCLUSIVE of any reinforcement. A 32mm buttweld to a 32mm buttweld would result in a 32mm thick weld. Reinforcement is not included.

 

[Fizza453]

Yes nominal thickness in your case 32 mm, forget at all weld reinforcement. Requirements for the need of PWHT are decided on the basis of weld nominal thickness (Joint Enfficinecy and UW-2 apply additionally).

Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN