Problems in the calculation of equipment flanges in SW6 tower

1. The “design pressure” mentioned in the calculations exported from SW6 or any other chemical equipment design software generally refers to the pressure value calculated in accordance with relevant design codes or standards, ensuring the safe operation of the equipment under given operating conditions. This calculated pressure takes into account the operating pressure (i.e., the internal pressure when the equipment is operating normally), the test pressure (i.e., the internal pressure during testing), as well as the design conditions (including temperature, medium, etc.). The design pressure is usually slightly higher than the operating pressure to provide a safety margin. It must meet the minimum pressure requirements specified in the design standards, while taking into account the maximum operating pressure that may occur. When designing and calculating towers or flanges, it is necessary to use specific design standards (such as ASME, EN, GB, etc.) and design methods (such as ASME BPVC Section VIII for pressure vessels) to determine these parameters. 2. As for the second point, due to the lack of specific data in the problem description, it is not possible to accurately explain why the \"two sets of data are different\" as you mentioned. Generally speaking, if you see two different pressure values in a calculation sheet, this may be due to different calculation conditions, safety factors used, applicable standards or codes, or different design stages (preliminary design pressure vs final design pressure). For example, the design pressure may vary depending on the standards, or the pressure value may change as the operating conditions are re-evaluated during the design phase. Meanwhile, during the design process, there may be a pressure value derived from calculations under the minimum design temperature (MDMT) conditions, and another from calculations under normal operating conditions. To obtain a more detailed answer, please provide more specific context and data, which can help explain the difference between these two pressure values. .

Can the first person provide a screenshot of the calculation sheet? Second, see 150 7.5.2 for details

The first is the minimum load required, and the second is the pre-tightening load estimated using the formula in GB/T 150 based on the selected bolt specifications