Ladders and platforms are also shown on equipment and structures that have them. Instrumentation symbols are included to indicate type, position, and orientation for accessibility by plant personnel. Written information placed on the arrangement drawing includes equipment coordinates, identification numbers, elevation callouts, line numbers, flow arrows, and dimensions establishing pipe locations. Once locations for foundations and equipment have been established, piping configurations are added to the drawing with the aid of symbols that represent fittings, flanges, and valves. It identifies all structural supports such as pipe racks, equipment structures, columns, braces and any fireproofing they may have. It shows all mechanical equipment and vessels in the unit and the pipes connecting them, including manholes, ladders, platforms, and davits. The piping arrangement drawing evolves from the foundation location and equipment location drawings. Information on the arrangement drawing aids in the development of the piping model and isometric drawings. This plan view drawing is a major source of information used in the fabrication and erection of the piping facility. The arrangement drawing is the most significant drawing developed by a piping designer.
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May 2023
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