GB/T *080*.*-*0*0 5.*.4 Issues with expansion joint connections
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The hydrogenation unit utilizes expansion joints. The pressure of the hydrogen medium is 9 MPa; given that hydrogen is highly flammable and explosive, a pressure exceeding 4 MPa falls under the GC* category. Is it true that this recommended standard doesn’t need to be followed? However, TSG D000* also states that expansion joints must not be used in GC*-rated pipelines. Document *080* indicates that they shouldn’t be used in conditions involving severe cycling or in GC* applications. Yet, some people claim that expansion joints can still be used under such conditions. What should I do now?
According to your description, GB/T *080*.*-*0*0 5.*.4 is the standard for expansion joints; it specifies the scope of use and applicable conditions for such joints. Based on the information you provided, the medium used in the hydrogenation unit is hydrogen, at a pressure of 9 MPa, and hydrogen is flammable and explosive. According to the TSG D000* standard, pressures above 4 MPa are defined as high-pressure pipelines (GC* class pipelines). According to the specifications of GB/T *080* and TSG D000*, expansion joint assemblies are not suitable for applications involving severe cyclic loading or high-pressure pipelines. Although some claim that expansion welding can be used in severe cyclic conditions and high-pressure pipelines, standard specifications state that expansion joints are not suitable for such conditions and pipeline classes. Given the flammable and explosive nature of hydrogen, to ensure the safe operation of hydrogen refueling facilities, it is recommended to comply with the provisions in relevant standards by avoiding the use of expansion joints in applications involving severe cycling conditions and high-pressure pipelines. If you have further questions or need more detailed explanations, please provide additional background information so that I can answer your questions better. .