Manufacture of high-pressure flange bolts factors seal failure

In order to analyze a large pressure vessel and heat exchanger design manufacture pressure test proposed by the preload of the phenomenon can not be high security seals and manufacture of reasons, from the difference between the actual performance of the bolt security seals elements and design values​​, and the principles and tighten tight frock operation and other aspects of the situation analysis carried out works of lists caused by lack of pretension load factor of 26 manufacturers. Different manufacturers and many other factors, the type of pressure vessel products, different sealing structures, different interaction with the designer, thereby causing the load difference is not regular. Proposed measures to obtain sealing effect, to ensure that the practice of fastening a sealing requirements set foot full load is tight enough to leave appropriate design of solid load margin