Joint efficiency for ellipsoidal heads

[shamrock138]

Hello All,
For a shell and head (ellipsoidal) circumferential type 2 joint with no RT,why does Compress use a 85% joint efficiency? If I manually enter a user defined efficiency of 65%, the program states a required marking of RT4, assuming that I am using RT.

 

[vesselfab]

assuming you are using a seamless head.

the je compress is using is based on 2 choices

the head to shell girth seam is fully radiographed or partially rradiographed per ug-11(a)5 b the je is 100%

any other rt or no rt of girth seam is 85%

this is inaccordance with uw-12 (d)

 

[shamrock138]

vesselfab,
Thanks for the reply. The heads are seamless, there is no RT performed, and the backing strip remains in place. UW-12(d) states 85% for type 3,4,5, or 6 joints and I am using a type 2. Am I just interpreting UW-12(d) wrong?

 

[vesselfab]

IT SAYS

E=.85 WHEN EITHER

uw-11a5b is not met

or

when welds are 3 4 5 or 6



what this says type 1 or 2 welds can be 100% if the uw-11a5b is met or 85% when not met

type 3 4 5 6 are 85 regardless of radiography