Issues related to surface flaw detection of fillet welds under new code requirements
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This post was last edited by zgj2405 on 2010-7-3 at 12:59. The jacketed container features a pressure-free inner cylinder, while the jacket is under pressure; the inner cylinder is made of 0Cr18Ni9 and the jacket is made of Q235-B. There are three issues for which I need your advice: 1. Must the inner cylinder’s head (the part that is not under pressure) also be made of 0Cr18Ni9? 2. Is it necessary to use PT for the reinforcement rings welded onto the inner cylinder? 3. According to the code, ultrasonic testing is required for the fillet welds of the pressure vessel’s pipe supports, as well as for the connections between pipes and the vessel body. Is ultrasonic testing also necessary for the connections between pipes and flanges?
3. According to the code, ultrasonic testing is required for the fillet welds of the pressure vessel’s pipe supports, as well as for the connections between pipes and the vessel body. Is ultrasonic testing also necessary for the connections between pipes and flanges? The requirement in the specifications for inspecting the fillet welds at the pipe connections isn’t as you might think. Look at the main heading 4.5.3.1 – it deals with the selection of non-destructive testing methods. In other words, it’s not necessary to inspect those fillet welds; however, if the drawings specify that inspection is required, then surface inspection can be chosen. As for the inspection of the pipe connections and flanges, it depends on the type of flange used. Hehe, for reference only
Your question isn’t clear enough. Based on the situation you described: regarding the material of the inner seal, it needs to be determined by taking into account factors such as the medium and temperature. Considering the condition of the cylinder, I estimate that it should be made of the same material as the inner cylinder； 2. The reinforcement ring of the inner cylinder does not require PT testing ； 3 The weld inspection of the nozzles and flanges shall be carried out in accordance with the requirements of Chapter 10 of GB150.