Do the flange connections on the equipment require radiographic testing?
Thread Content
For example, for a pressure vessel of Category II that is to undergo a pressure test, with the pipe end flange connected to a straight section and a elbow, is it necessary to perform 100% radiographic inspection on this straight section and elbow? Where is the rule for 150? Thank you!
I’m not sure; is this pipe section part of the pressure vessel itself?
GB/T150.4-2011 Clause 10.3 of P335
GB/T150.4-2011 Clause 10.3 of P335
According to clause 10.3.3, if the value is less than 250 mm, it is to be determined in accordance with the design documents; but then what determines those design specifications?
The person who posted it didn’t explain things clearly; it would be better if you sent a photo or some drawings.
Generally, it is classified as follows: the butt joints of the cylinder are of type A or B, while the fillet joints are of type D. 100% radiography or ultrasound is only available for Type A and Type B joints.
It’s just a fitting on the cylinder or the head. But this connection is quite long: there’s a elbow first, and then a flange. So, what type of weld are the joint welds at the connections and elbows, and is it necessary to take X-rays?
It’s on the ontology side; it’s about taking over.
Renovation of pressure vessels. Inform? Drawing documents?
Flange connections are not required; they fall outside the scope of the main body. For welding, it depends on whether to use full-ray ultrasonics or partial-ray ultrasonics. If it meets all the criteria, then it is necessary; if it is only partial, then it is generally not necessary. Judgment clauses in TSG 21-2016 3.2.10.2.2.2 and GB/T150-2011 10.3.1