Non-destructive testing of pipe flange elbows
Thread Content
According to clause 10.4(d) of GB150.4-2011, surface inspection is required for butt and fillet joints of austenitic stainless steel with a thickness greater than 20 mm. Since many stainless steel plate welding flanges and necked welding flanges have a thickness exceeding 20 mm, it is necessary to determine whether penetrant testing is required for the fillet joints between these flanges and the pipes.
For ordinary flat welding flanges, surface inspection is required for the welds.
This specification refers to the thickness of the welded joint, not the thickness of the base material. It is mainly because thick austenitic stainless steel welds, which are welded joints, are prone to surface cracks.
The height of the welded joint has nothing to do with the flange, unless the pressure is extremely high; such situations are quite rare in practice. Doing PT is also very simple; you just place a PT order, and the testing will be carried out automatically. Is there any difficulty in that?