How to select fasteners, gaskets, and pipes for ASME B16.5 flanges
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Dear experts in the marine industry: Recently, for several pieces of equipment, the specifications require that the pipe ends use flanges in accordance with ASME B16.5. So, should bolts, nuts, and gaskets be selected sequentially as per ASME B18.2.1, ASME B18.2.2, ASME B16.20 (metal gaskets) or ASME B16.21 (non-metallic gaskets)? This is the first question ； The second question is: if only ASME B16.5 flanges are used, are there corresponding standards for bolts, nuts, and gaskets from HG, SH, and GB that can be used in conjunction with them? Third question: Since ASME B16.5 flanges are being used, can the equipment connections still use pipes that comply with national standards such as GB 8163 or GB 9948, or pipes that meet petrochemical industry standards? Do we still have to choose according to American standard pipes? I earnestly ask all the experts for their guidance. Thank you:handshake
It is best to use bolts and gaskets that meet American standards. As long as the pipes belong to the series with a large outer diameter, they can be connected; it doesn’t matter whether they meet American standards or not
So, should bolts, nuts, and gaskets be selected sequentially as per ASME B18.2.1, ASME B18.2.2, ASME B16.20 (metal gaskets) or ASME B16.21 (non-metallic gaskets)? This is the first question ； It is best to use materials that meet American standards. Additionally, note that ASME B16.5-2017 has replaced bolts with those specified in ASME B18.31.2. The standard for double-headed studs in ASME B16.5-2017 has also been changed to ASME B18.31.2 Haichuan Chemical Industry Forum - https://bbs.hcbbs.com/thread-2139670-1-1.html Second question: If only ASME B16.5 flanges are used, are there corresponding HG, SH, and GB standards for bolts, nuts, and gaskets that can be used in conjunction with them? There shouldn’t be any gasket washers in ASME B16.5, right? If the size, specifications, and material are the same or better, they should be replaceable. Third question: Since ASME B16.5 flanges are being used, can the equipment connections still use pipes that comply with national standards such as GB 8163 or GB 9948, or pipes that meet petrochemical industry standards? Do we still have to choose according to American standard pipes? There should be no restrictions on the materials used for takeover; as long as the outer diameter, wall thickness, and pressure-bearing capacity are compatible with those of the flange, it should be fine.
First of all, thank you very much for answering my questions. I asked the other people in the room, and it was said that flange should comply with ASME B16.5 standards; bolts and nuts can be chosen from HG 20634 standard, while gaskets can be selected from HG 20631 standard. I’d like to ask Haiyou: do you have any experience with such applications?
As a supplementary note regarding gaskets, the standards for gaskets corresponding to ASME B16.5 are ASME B16.20 (metal gaskets) and ASME B16.21 (non-metallic gaskets). The gasket corresponding to AMSE B16.5 under the HG standard is HG/T20631
ASME B16.5 is an American standard, and it is compatible with HG/T20615 and SH3406
First, are your design standards ASME or GB? Choose the corresponding seamless tube and fastener materials accordingly. Additionally, the flange dimensions of HG/T20615 are similar to those of ASME B16.5 (note that it is only similar), this standard does not include the CLASS400 grade, and the bolt holes are designed for M-sized bolts.
2. ASME B16.5 corresponds to the national standard flanges specified in HG/T 20615; bolts, gaskets, etc. can be used interchangeably. 3. American standard flanges can be chosen, as well as materials that meet national standards； But it’s generally not done; first, there’s no need for it, and second, it doesn’t work well when mixed together