Most engineering and construction companies draw a piping isometric of every piping configuration to be installed in the facility. After configurations are fabricated, isometrics serve as an aid to the construction and erection of the facility by providing workers with the locations of tie-ins, connections, and routings. Once drawn and properly dimensioned, isometrics are provided to fabricators who will build each piping configuration. Isometrics are also used by many companies as fabrication drawings. This means all piping components (elbows, flanges, nuts, bolts, washers, gaskets, etc.) must be accounted for so that purchases of those items can be made. Material take-off is the process by which each individual component that makes up a pipe configuration is tabulated for purchase or procurement.
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