The meaning of pipe grade
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Question: In the pipe designation P001-PW-150-10A11(H), does 10A11 represent the pipe grade? What does that mean? Why wasn’t it found in HG/T20519-2009?
The pipeline grade code is determined by each design institute itself, and can be found in the project’s unified regulations.
The legends used by various large design firms vary, while smaller design institutes generally follow HG20519.
The design institute should provide a set of design specifications that can be referred to
You need to refer to the design specifications regarding the grade of pipeline materials issued by the relevant design institute; similar documents provide detailed explanations
Specifically, it is the cover page diagram of the flowchart. If the design institute does its job properly, the descriptions regarding the pipe grades must match each item in this project, as well as its sub-items.
Not necessarily; I’ve encountered a design institute that came up with its own set of rules for us.
Design specifications are internal documents of the design firm; not all of them are provided to the client or the construction party.
This usually includes the pipeline material code provided by the process package supplier, with numbers and letters indicating the pipeline material and pressure rating. There is a basic corresponding explanation for this figure, and the design institute will carry out the necessary conversion at the end!
The pipeline grade is determined by each company according to its own standards, and it varies from one company to another. The description of the pipeline grade indicates what the material grade means. It generally includes the material, pressure rating, and serial number. I have also seen grades that include a flange sealing surface.
The pipe grade for HG20519 is one way of expressing it; another way is given in Chapter 6 of Part 2 of the \"Design Manual for the Installation of Process Piping in Petrochemical Plants\", which lists the pipe grades. 10A11: here, 10 represents a nominal pressure of 10 MPa, A denotes the basic material – materials such as 10, 20, Q235B, etc. – and 11 is the sequence number.