Questions about HG 20519
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Let me ask you a question: HG20519 P75 What does the red line below mean? What situations will you encounter? Thank you.
For example, there are two units AB, and the out-of-bounds pipes of A are numbered according to the main item of B.
Is the pipeline from device A transporting materials to device B?
It’s all fine. It’s optional. Just set the principles first and do them uniformly. It’s not so rigid.
This situation is relatively common. For example, if an engineering project is divided into 20 units such as esterification, carbonylation, hydrogenation, tank area, pipe gallery, and refining, then the main item number of the pipe gallery is more suitable for this scenario.
The outer pipe gallery has a separate main item number, so the pipes outside the boundary area use the outer pipe main item number.