When should the half-tubes of such containers be welded together?
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For the semi-tube containers in the above category, the inspection agency requires that the internal cylinder be pressurized before the semi-tubes can be welded together. At present, the welds on our cylinder have been 100% inspected using RT; can we assemble the coiled tube before applying hydraulic pressure to the inner cylinder?
It can be welded. There are basically two scenarios: one is to cut it off. Second, without the inspection certificate, it cannot leave the factory and is discarded as waste. It’s no big deal. Welding—that’s all there is to it. Just do it!
Refer to the jacketed vessel: first test the inner cylinder, then weld the jacket
If the half-pipe is welded before the water pressure in the inner tube is applied, what should be done in case of a leak in the water pressure? Cut a part of the half-tube?
Even for RT-approved ones, water pressure doesn’t guarantee 100% leak-free performance; moreover, the weld of the half-pipe overlaps with the main weld
A welding coefficient of 100% isn’t feasible; if there are really issues, double welding is required. When only half of the tube is available, welding inside the container is the only option, which means a coefficient of 85%. Besides, when you carry out suppression, you can’t let the special inspection agency get inside the container to check for weld leaks, right?