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Line weight distinguishing main process flow from services.
Also known as: Major process line, Utility line marking
On a process diagram the heaviest lines carry the main process flow, lighter lines carry utilities and services, and instrument signals are lighter still. The hierarchy is what lets a reader find the process through a page of pipework.
Distinguishes main process lines from utility and service lines by drawn weight, with instrument signals lighter again.
Contexts: Technical drawing
Exists so the primary flow can be traced through a crowded drawing, which is the first thing a reader does with a process diagram.
Contexts: Technical drawing
Straight lines of markedly different thickness running across the drawing, the heaviest carrying the main flow.