ASME flange forging grade issues
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I am designing a tower; the client requires that the flange standards comply with ASME16.5. I have chosen grade II forgings for this purpose, but the flange manufacturer told me that ASME flanges must be made from grade III forgings. I would like to ask if there are such regulations in the ASME system? I searched for a long time but couldn’t find any evidence; is it necessary to use grade III forgings? Or where are the regulations regarding the grade of forgings used for flanges? Thank you! !
You mean to use materials that meet national standards, as well as flanges in accordance with ASME16.5 standards; there is no such thing as Grade II or Grade III in the ASME standards. You can refer to the national standard for flanges, HG20615. I recall that the standard specifies that flanges with a certain weight threshold or higher require compliance with Grade III or higher standards.
Well, yes. The forging standards are national standards. I’ve also found the forging requirements for HG flanges; this seems to be the only reference available. Thank you so much!
ASME standards do not specify grades for forged materials.
For pressure equipment designed for 150, can the connection flanges use foreign standards? If possible, should the flange material be made from forgings that meet national standards or those in foreign flange standards?
That’s exactly my situation right now. The equipment is designed in accordance with domestic tower equipment standards. Since the owner of the entire installation uses ASME flanges, it is required that the flanges on my equipment be replaced with ASME ones. However, the forging standards that are followed are also the domestic forging standards; that’s why when purchasing flanges, the flange manufacturer stated that for ASME flanges, domestic forgings must be of grade III or higher. I just can’t find where this basis he mentioned is.
Study* study*. I have encountered this situation before as well; the approval required that it be changed to the HG/T20615 flange standard. Back then, I lacked the courage, and since we weren’t from the same company (it was basically illegal to use someone else’s company’s credentials to carry out projects), they were so busy every day that there was no one to ask. I looked for it myself later, and didn’t find any indication that it wasn’t allowed.
Without further ado, take care of the tower flange yourself.