QW-193.1.3
QW-193.1.3
(OP)
We have to qualify tube to tube sheet joint in accordance with ASME Section IX.
Joint is groove plus fillet type. Groove depth is 7 mm and fillet leg size is 3 mm.
QW-193.1.3(a) talks about "Minimum Leak Path Dimension", in the above case is it 7+3=10 mm?
I interpret "minimum leak path dimension" as the distance fluid covers if it were leaking. So it covers 10 mm distance if it were leaking. Please advise.
Joint is groove plus fillet type. Groove depth is 7 mm and fillet leg size is 3 mm.
QW-193.1.3(a) talks about "Minimum Leak Path Dimension", in the above case is it 7+3=10 mm?
I interpret "minimum leak path dimension" as the distance fluid covers if it were leaking. So it covers 10 mm distance if it were leaking. Please advise.
Nasir
Welding Engineer
DESCON ENGINEERING LIMITED
PAKISTAN





RE: QW-193.1.3
The leak path in a T/TS weld is measured from the bottom of the weld where it meets the annular space between the tube and tube sheet hole to the point on the surface that is closest to the this bottom starting point. In a perfect weld that has full penetration to the bottom of the groove and has the proper size fillet on top, you are correct it becomes 10+3mm. But when you section the mock up you may find the welders did not do a perfect weld and the minimum leak path may be at a 45 degree angle up from the bottom of the weld. I have seen all types of poor welds with minimum leak paths in all directions.