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Because drawings tend to be large and
complex, finding a specific point or piece of equipment on a
drawing can be quite difficult. This is especially true when
one wire or pipe run is continued on a second drawing. To
help locate a specific point on a referenced print, most
drawings, especially Piping and Instrument Drawings
(P&ID) and electrical schematic drawings, have a grid
system. The grid can consist of letters, numbers, or both
that run horizontally and vertically around the drawing as
illustrated below. Like a city map, the drawing is divided
into smaller blocks, each having a unique two letter or
number identifier. For example, when a pipe is continued
from one drawing to another, not only is the second drawing
referenced on the first drawing, but so are the grid
coordinates locating the continued pipe. Therefore the
search for the pipe contained in the block is much easier
than searching the whole drawing.
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