Note: Blank spaces are impossible or improbable combinations.
Source: By permission from Oriolo D.J., Oil Gas J., Nov. 17, 1958; also see ISA Stds Latest edition.
A schedule similar to Figure 14.20a is used to summarize insulation process code or class, and pressure test information to the erection contractor. The process code is the complete code specification (as a separate fluid process service detailed for each fluid) tabulation for the required piping materials, fittings, valves, gaskets, thread lubricant, etc., for a specific process or utility fluid (see Figures 14.21 and 14.22). For example, it identifies the type of gate, globe, plug, check and needle valves to be used in the fluid by specific catalog figure number of a manufacturer or its equivalent. This requires attention to materials of construction, pressure–temperature ratings, and connections (flanged, screwed, weldend), bonnet type, packing, seat type (removable or non removable), stem, and any other details affecting the selection of a valve for the process fluid conditions. It also contains the specifications for pipe, fittings, flanges, unions, couplings, gaskets, thread compound, bolting, and any special materials needed to properly complete the piping requirements.
Other schedules and summaries include vessels (tanks and drums), towers or columns, heat exchangers, pumps, compressors, motors, trip, utility summary, hazardous chemicals and conditions, safety analysis table, etc. These are often developed by the process engineer for organizational uses by the process designers as well as by other engineering groups. Again, these are often cooperatively and sometimes completely prepared by a particular specialty group after interpreting and designing for the needs of the process, (Figures 14.23–14.28). These figures and many others (process data sheets) can be downloaded from the companion website.
Two types of schedules are in use:
1 1. The summary sheet, which summarizes process conditions and equipment selection.
2 2. The schedule sheet, which summarizes the key reference data for a particular class of equipment such as pumps, but contains no process data. The latter type is prepared for job coordination with and in the various departments, i.e., engineering, construction, purchasing, and production. It primarily serves for the construction period but, of course, does have lasting cross-reference value.
Figure 14.23 Centrifugal pump summary.
