Joint Efficiency in Finite Element analysis (Asme Sec VIII Div 2)

[dali13]

Dear All,

I am working on the calculation of a Pressure Vessel according to the ASME 2011 Sec VIII Division 2.
I am modelling the Pressure Vessel using the Finite Element Methods and the Elastic Stress Analysis Method (Part 5 - Asme 2011 Div 2).

The Vessel I am working on has a weld joint efficiency of 0.7
The part 4 of Asme 2011 (Div 2) says that "The weld joint efficiency of a welded joint (..) is used in the design of a joint as a multiplier of the appropriate allowable stress value..". (4-2-4)

Should I consider this even in a finite element analysis according to part 5.
Should I multiply the allowable stress value by 0.7 in my case.

Besides, if I should apply the 0.7 factor, should I apply it also for the pressure test loading?

Last point, could I use the allowable stress defined in Part 4 (4.1.6.2) for the test condition.
Could I multiply the allowable stress for test by a factor of 1.5 to validate a local stress in the finite element method.

Thank you all
Ali

 

[TGS4]

Which weld joint has the 0.7 factor? What component of the vessel are you evaluating?

 

[dali13]

The weld joints having 0.7 factor are Category A - B and D in this case (No radiographic examination):
- Category A: Longitudinal welded joints within the main shell, circumferential welded joints connecting hemispherical heads to main shells.
- Category B: Circumferential welded joints within the main shell.
- Category D: Welded joints connecting nozzles to main shell.

Thank you