How to determine the material on a PID diagram
Thread Content
For example, if the material of the pipeline is CPVC, is the ball valve on that pipeline also made of CPVC? In some sections, it is TA2; in such cases, how should the material of the valves on the pipeline be determined?
For specific details, refer to SEI’s pipeline grade table
Reply to 2# gujiaming1985: I only have a PID diagram; I need to extract information from it regarding valves, pipes, and similar elements. There’s nothing else available. Also, how can I determine the connection methods of the valves? For example, how do you determine internal threads and flanges?
It cannot be determined without a pipeline grade table. On the pipes shown in the PID diagram, there is a pipe grade indicated, such as 1.6A3, etc.; the specific material should be referred to in the pipe grade table.
Reply to 1# czll3387: It is necessary to refer to the material grade table provided by the materials engineering department in order to make a determination. This department defines which types of pipes and corresponding connection methods should be used for various materials – for example, which materials require threaded connections, which ones need flange connections, and whether welding by butt joint or surfacing weld should be used. All that is required is for the process engineering and piping engineering teams to consult the grade table.