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In the time of uncertainty, Bolted stub end is most essential to be prepared some kind of emergency handling devices based on our experience & also needs may arise suddenly. In chemical process industries, the piping is most important part of plant. In age old plants or in corrosive chemical application or weather, there may be failure of pipe by puncture. Sometimes may need some kind of modification for extension or shortening of piping. In both cases Bolted stub end is most essential to have piping flanges to work quickly.
If Bolted stub end is not available, then hot work is a major risky and time consuming procedure with production loss. Here by using this small bolted stub ends we may avoid welding and flanging work. Also the major important is that Bolted stub end requires only one skilled person and job may be completed in few minutes. This is suitable for liquid as well as solid handling piping.