PID pipeline number
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If the pipe material changes, does the pipe number need to be renumbered? If a pipeline carries two different media in sequence, how should the material code for that pipeline be named?
It needs to be renumbered; the pipe material grade has changed.
For the same pipeline, the material of the branch pipe changed, and a new number was assigned.
When the pipe material changes, there is no need to renumber the pipe
When a pipeline carries two different media, the material used should be that suitable for the more demanding medium. This includes pressure class, medium code, material code, corrosion allowance, and additional conditions. If two different media are used in sequence, such a situation is not common under normal operating conditions; for purposes such as purging, replacement, pre-cooling, etc., it is necessary to take into account the most demanding conditions in order to ensure they are met. In principle, it should be named using the code of normal materials, but a note is required. That is, the note when looking at the PID.
A change in material definitely requires renumbering and updating the PID diagram! What does it mean by two different media? The mixture again?
It’s not a mixture; during catalyst regeneration, the deionized water flows through the same pipe first, followed by methanol
Then use the standard for methanol, which has a high risk factor