![]() ![]() Coordinates indicate the measurement from the control point to the particular structure, foundation, or piece of equipment that the coordinate locates. By defining the control point as O'-O", O'-O" and using a north arrow to establish orientation, the numerical values assigned to the coordinates allow for exact positioning of all facility components. The control point, therefore, becomes the primary reference point for the entire facility. The control point is used as the origin from which the intersecting north/south and east/west lines are labeled as coordinates using numerical values. It is often located so it will not be accidentally damaged or destroyed. The control point, more commonly known as a bench mark, is a permanent marker erected in a remote area of the piping facility. These intersecting grid lines, which originate from a designated control point, are drawn parallel to the north/south and east/west axes. ![]() Universally recognized throughout the piping industry, the plant coordinate system uses intersecting grid lines, similar to the Cartesian coordinate system, to locate buildings, structures, foundations, equipment, and piping configurations. Plot plans, foundation location drawings, and equipment location drawings are developed using the plant coordinate system.
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