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Nonindicating (Blind) Valves Self-Actuated valve Safety Valve Recording Indicating Recording Indicating Nonindicating (Blind) Primary Elements Wells Glass Devices for Visual Observation RC IC C CV V SV R I RA IA A E W G Flow F FRC FIC FV FR FI FRA FIA FA FE FG Level L LRC LIC LC LCV LV LR LI LRA LIA LA LE LG Pressure P PRC PIC PC PCV PV PSV PR PI PRA PIA PA PE Speed S SRC SIC SC SCV SSV SR SI SRA SIA SA Weight W WRC WIC WR WI WRA WIA WE Analysis A ARC AIC AC ACV ASV AR AI ARA AIA AA AE Hand H HIC HC HCV Temperature T TRC TIC TC TCV TV TSV TR TI TRA TIA TA TE TW Special X XRC XIC XC XCV XSV XR XI XRA XIA XA XE

      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,

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