Flange and bolt matching problem
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Please tell me, the medium of the pipeline is melt, the temperature is 280°, the pressure is 20MPa, the pipeline flange is a 2500# necked butt welding flange, what grade and material should the bolts be equipped with? My doubt is that all current pipes are equipped with ASME B16.5 ASTM A193-B7. Is it necessary? For example, a 100° hot water pipe is equipped with the same bolts as above.
I am also confused, but the pressure here is not so high, 20MPa, which is too high!
Since the flange is American standard, the bolts should also match. In addition, 20MPa is not high compared with the 30+MPa in synthetic ammonia.
What materials are used for bolts can be found in general manuals. For example, "Petrochemical Pipeline Installation Design Manual" is available on pages 333~334 and 344~345. You can check it out by yourself, I won't be verbose. 20MPa is nothing!