Flat-bottomed, flat-lid removable atmospheric pressure container

For flat-bottomed, flat-roofed storage tanks, there are design standards for flange connections at the top. In addition to HG/T3146-1985, there are other relevant design standards, such as ASME codes. These standards typically include design requirements for different sizes. Regarding the situation you mentioned, since the specifications in HG/T3146-1985 go up to DN1000 at most, while the customer requires sizes of DN1200 and DN1400, it may be necessary to find other relevant standards or proceed with a custom design. You can consult professional engineers or design firms to obtain more accurate design requirements and feasible solutions. During the design process, factors such as the safety, reliability, and pressure resistance of the container should be taken into account, and design and manufacturing should be carried out in accordance with relevant ** or industry standards. .