Some questions regarding the grading scale,
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I used to work with the grade tables from the SH series, such as 2B5, 2B6.5L5, and so on. Recently, I’m working on a renovation project, and grades like 1.6B2 and 1.6B5 have appeared. I know these correspond to 16 kilograms, but I don’t have the relevant database at hand and don’t know what to do. I checked Volume 2 of the red book, but the grades listed there aren’t complete either. Can anyone help? Thank you!
There should be no universal grade chart; one should consult the instructions for it. A complete grade chart should include... Some may also be included in the explanation of pipe numbers within the PID legend symbols.
“Have you gone through Volume 2 of the Red Book? What is a red book? It’s best to check the homepage image for this question.
It should be the Installation and Design Manual for Process Piping in Petrochemical Plants (a total of four books). The classification tables vary from one unit or project to another, with no unified standards.
My current problem is that the modification project I’m working on involves moving a piece of equipment. I saw the level 1.6B2 mentioned in their original blueprints; there’s no grade chart or anything like that, so I’m wondering what kind of level 1.6B2 is – and which design firms commonly use it
There’s the name of the design institute on the blueprint, right? Hehe, go look and ask
I have this data here, as follows: 1.6B2: Nominal pressure of 1.6 MPa, flange sealing surface type RF. Design conditions: 1.5 MPa, temperature 150°C. Corrosion allowance: 1.6mm. Stress relief: None. Pipe parameters: DN15~40, SCH40, 20#, GB8163; medium-pressure asbestos rubber gaskets. DN50~500, SCH20, 20#, GB8163; medium-pressure asbestos rubber gaskets. 1.6B5: Nominal pressure of 1.6 MPa, flange sealing surface type RF. Design conditions: 1.0 MPa, temperature 250°C. Corrosion allowance: 1.6 mm. Stress relief: None. Pipe parameters: DN15–125, SCH40; material: 20#, GB8163; steel strip – flexible graphite tape. Outer ring for DN150–500: SCH20; material: 20#, GB8163; steel strip – flexible graphite tape. Outer ring for DN600–700: 10, 20R; material: GB6654; steel strip – flexible graphite tape. Outer ring for DN800–1000: 12, 20R; material: GB6654; steel strip – flexible graphite tape. Hope this is useful to you, O(∩_∩)O haha. This post was last edited by huamei461112 on 2009-2-21 at 14:15
Hehe, it took me 15 minutes to copy it – I haven’t typed this intensively in ages
Material grades vary from place to place, so they are likely not interchangeable. It’s better to check what the original design specifies~