Consult HG and GB pressure pipeline standards
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Recently, I saw a comparison between HG and GB standards in a book. I have some doubts. If the HG standard is used in general chemical projects, the pipes will use HG20553 and the pipe fittings will use GB12459. However, in the HG standard system, there are also pipe fitting standards HG21635, HG21634, etc. I just don’t know why the HG series is not used, and the pipe fittings use GB12459? What is the difference between the two? Experts please enlighten me!
At present, domestically produced pipe fittings are produced in accordance with GB12459, just for the convenience of procurement.
Personally, I think* * The standard is more restrictive than the industry standard, so choose it if there are no special requirements. * * It’s standard and easy to purchase. This post was last edited by Pipe Fittings on 2009-2-25 16:23 ]
Industry standards are formulated within the scope of national standards. The scope of national standards is wider, and industry standards cannot conflict with national standards. For example, national standards are like the constitution, and industry standards are like the laws of various industries. If there is no conflict, there cannot be any! This post was last edited by chinazwr on 2009-2-26 20:42 ]
Generally, pipes are made of GB8163 or 9948, etc.* * Standard series, which facilitates the production and manufacturing of manufacturers, as well as project procurement. But there is a difference when it comes to pipe fittings.: Elbows are mostly made of SH3410 or 3408, larger diameter ones are also made of GB12459, and some pipe fittings such as nipples are available in both GB and SH. When selecting pipe fittings, we mainly choose them based on the pipe material grade table.
The HG series corresponds to the American standard, but domestic projects generally use the GB series!