Pipeline number
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Seek solution for 500-LLS-10304-3B2S1 (H90) on the pipeline
This is usually indicated on the first page of your PID diagram, with a breakdown of the pipeline numbers. 500 should be the pipe diameter, while LLS should refer to low-low pressure steam as the medium. As for the next two sets of data, you need to compare them in order to understand their meaning!
500 is the pipe diameter, LLS is the medium code, which should be low-pressure steam or steam; 10304 is the pipeline serial number, 3B2S1 is the pipe grade or classification, and H90 refers to the insulation material. The most important thing is to first understand the homepage diagram of the flowchart, which will provide you with a detailed explanation.