Before revision: In the process industry, chemical industry, manufacturing industry, and other commercial and industrial contexts, pipe marking, typically carried out by marking piping through labels and color codes, is used to identify the contents, properties and flow direction of fluids in piping.
After revision: Pipe marking on a natural gas pipeIn the process industry, chemical industry, manufacturing industry, and other commercial and industrial contexts, pipe marking, typically carried out by marking piping through labels and color codes, is used to identify the contents, properties and flow direction of fluids in piping.