Seek help: How should welds be marked on a single-line diagram of a jacketed tube? The jacket flanges are flat flanges – how should fillet welds be handled?
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1. The flanges used for the jacketing tubes are of type PL; how should such fillet welds be indicated on the single-line diagram? 2. The inner tube requires 100% RT inspection, but fillet welds cannot be used for this purpose – how can this issue be resolved? 3. When preparing the welding ratio confirmation sheet, should fillet welds be taken into account? I would appreciate advice from those with expertise in this area! ! ! ! ! ! !
OP, the issue is that with the JPL flange you’ve chosen for this jacket, it’s not possible to meet the RT requirements either on the inner or outer side; only butt welding can satisfy these RT requirements
That’s indeed the case, but what the design institute provided were JPL flanges
Fillet welds are generally not subject to radiographic testing, as this technique is too complex. What does the design institute rely on to determine a 100% inspection rate for such welds? Radiographic testing is used for butt welds, while fillet welds are generally inspected using magnetic particle or penetrant testing; the design institute should clarify these requirements. The fabrication of jacketed tubes does not necessarily require flange connections; our inner tubes are joined end-to-end, while the outer jacket is secured using retaining rings. It is easy and simple to manufacture; the inner tube can be at 100% RT, and the connection of the outer tube’s retaining ring is achieved through fillet welding.
So you’d better choose JWN. With something like this, one has to doubt how the outer tube is inspected and welded; of course, there’s no problem with the inner tube