A question about pipe grade numbers
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According to HG20519, the pipe grade code consists of 3 digits, such as the common L1B. The second digit, “1”, is a sequence number that starts from 1, with no specific regulations regarding its value. I heard that different departments have their own customary ways of numbering, and I’m not sure what the specific rules are. I hope someone with more experience can give me some advice. Thank you first!
The original poster didn’t make their point clear – “There are no specific regulations regarding a numbering system.” I heard that different departments have their own customary ways of coding; I’m not sure what the specific rules are. Indeed, there is no unified standard for pipeline grade numbers, and even the way in which pipelines are denoted varies from one place to another. Different design firms, when providing piping diagrams, attach their own piping grade tables, which contain detailed specifications; it’s clear what each notation means. Therefore, the original poster doesn’t need to take this issue too seriously, as there are no unified rules governing it.
Received, thanks to the seniors!
The intermediate serial numbers are generally used to distinguish between media with significantly different properties; for example, water and gas cannot be assigned the same grade under the same operating conditions. Since water does not require the same standards as pressure pipelines, these two media are differentiated using grades such as L1B and L2B – they represent separate grades, even though the pressure and material characteristics are the same, the requirements differ. The same principle applies to everything else; for example, gasoline and diesel have similar properties, which is why they can share the same grade designation. This post was last edited by Boring Pavilion Grand Scholar on 2009-2-7 01:13]
Indeed, different design institutes have different numbering rules. Design institutes abroad are also different. But there are detailed explanations for all of them.