Seeking advice on pressure and temperature ratings, thank you!
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I would like to ask the forum members: In the United States, except for the 150# grade which is based on 260°C, all other grades are based on 454.6°C. ”Which standard does this description in the figure come from? Thank you!
The operating pressure at the operating temperature is related to the material grade, and standards should be established based on a certain group of materials.
The description in the image is cited on various websites, but no one has ever been able to verify its origin. Including the HaiChuan Forum, I’ve seen other forum members ask similar questions, but none of them received a formal answer.
From the preparation notes of standard HGT20592~20635-2009.
Pressure-temperature limits are provided in the form of tabulated data in HG/T20592-2009, H/T20615-2009, and ASMB B16.5-2013. The basic data is obtained through experiments (which includes representative temperature-pressure values for various ranges); formulas are then developed based on these distribution curves to derive other data. Finally, a safety factor should be added if necessary. So, in summary, unless you are working in material research, there is no need to know what that formula is; you can simply look it up in a table, as the data in those tables has been used for many years.
The texture I quoted is from \"Design of Petrochemical Pipelines\" by Cai Erfu; this passage is cited on various websites. It took me a long time to find the sources of these citations, which turned out to be \"Design of Petrochemical Pipelines\". However, the information stops there – regarding temperature and pressure grades in the United States, while grade 150# is based on 260°C, all other grades are based on 454.6°C. ”This sentence describes it. Various searches and forums everywhere were unable to reveal the origin of this phrase, including Haichuan. They are all discussions that end without any result.