What does 2.5A1 mean in the classification of process pipelines?
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This post was last edited by Binggua on 2010-12-10 09:25. Why is the notation for pipe grades in the depth of process design and construction different from the method used by design institutes? In HG/T 20519-2009, the notation format is A1A (nominal pressure – sequence number – pipe material category). However, SEI itself specifies formats such as 2.5A1, 2.5A2, etc. 2.5 represents pressure, but what does A2 mean? Does anyone know?:'
It’s better to clarify the question; for example, something like 450-CO-D5-H60 makes it clear. Can you read it clearly just by writing 2.5A1, 2.5A2? Go and take a look at its process, instrument, and equipment symbol diagrams – it’s all clearly written there.
2.5---Pressure rating； A-----Material ； 2-----Sequence number
What was said on the 3rd floor is correct; a general description is provided in the legend of the process flow diagram within the complete set of designs. To figure this out clearly, one needs to look at which design institute’s standards are being followed.
2.5: A digit indicating the flange pressure rating in MPa; 2.5Mpa. The letter A denotes the basic material code – carbon steel. 1: A digit indicating the grade sequence of pipes with the same flange pressure rating and basic material