Hot Tapping Hydrotest Buckling Calculation
Hot Tapping Hydrotest Buckling Calculation
(OP)
I am working on an external pressure calculation for a hot tap during hydrotest. To derive Factor B&A I need L/Do and Do/t according to equation is from ASME Sec. VIII, Div. 1, UG-28.
In case of vessel, the "L" value is specified as length between stiffening ring but what about for pipe? I assume that the "L" value would be branch OD but generally for pipe (specially hot tapping hydrotest), how do you apply "L" value?
In case of vessel, the "L" value is specified as length between stiffening ring but what about for pipe? I assume that the "L" value would be branch OD but generally for pipe (specially hot tapping hydrotest), how do you apply "L" value?





RE: Hot Tapping Hydrotest Buckling Calculation
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: Hot Tapping Hydrotest Buckling Calculation
RE: Hot Tapping Hydrotest Buckling Calculation
Also depends a lot on what your hot tap tee looks like and where it is welded.
Many people don't pressurize greater than the internal pressure to avoid all these issues as the max DP often comes out only 5-10 bar more (10% more than internal operating pressure).
Try typing "hot tap pressure test" into the search box at the top - a few good answers.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Hot Tapping Hydrotest Buckling Calculation
RE: Hot Tapping Hydrotest Buckling Calculation
#mk3223
Thank you for your answer.
The problem is that normal saddle type split tee has been rejected by Company because of small annular gap between the tee and the run pipe which may lead to corrosion problem.
I will apply Reinforced Set-On Branch type for hot tapping.
So, welding line will not be linear, but Circle. The size is 42"x 36" Flare.
RE: Hot Tapping Hydrotest Buckling Calculation
Hope it helps.
RE: Hot Tapping Hydrotest Buckling Calculation