Regarding the temperature-pressure curve
Thread Content
The temperature and pressure curve according to the HG20592 Chinese standard is as follows: PN10.0 at 300°C, with a pressure resistance of 5.9 MPa; at 250°C, the pressure resistance is 6.5 MPa. Meanwhile, the temperature and pressure curve according to the American standard is PN11.0 – 5.14 MPa at 300°C, and 5.76 MPa at 250°C. We currently have a pipeline whose operating temperature is 285°C and pressure is 6.0 MPa. Using a pipeline that meets the PN10.0 European standard should be sufficient according to those requirements, but it would not meet the American standard. Can someone explain this?
Please check the flange material; it should be different, and the appropriate one should be selected based on your flange material
As a supplementary note, all pipelines are 20G grade, and the flanges are made of steel grade 20; the standards mentioned refer to the material being steel grade 20