Is flaw detection required for the small end of the conical head and the pipe connection?
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1. A heat exchanger with a tube box featuring a conical head, without flanges; the connections are welded to the smaller end of the conical head. Is this weld a butt weld or a fillet weld? If the pipe fitting is under pressure, is flaw detection required for this weld?
The joint between the takeover and the small end of the conical head should be a butt weld. This weld shall be inspected for defects as required.
This post was last edited by zjq1962 on 2018-2-4 08:13. According to GB150.1 for the classification of welded joints, this joint belongs to Category B welded joints. However, whether non-destructive testing is required and what method should be used for such testing, I believe should be determined based on the diameter of the smaller end as well as the operating conditions of the equipment.
For DN less than 250, UT+MT(PT) is generally used； If it’s greater than 250, RT is required, but surface inspection can be waived