The platform/grade/building wall/dyke or bund wall/floor penetrations and limits of road crossings are properly shown wherever applicable. downstream of a check valve.Īdequate pipe spool lengths are provided for wafer type butterfly and check valves to prevent the interference of the valve disc with adjacent piping items. High point vents and low point drains are provided, as per project requirements, for lines that will be hydro-tested.ĭrains are provided wherever liquid stagnation can occur in the lines e.g. N) Specific requirements mentioned in applicable P&ID notes (if any) are complied M) Insulating gaskets are selected as shown in P&IDs L) Equipment nozzle/TP numbers and tie-in numbers. K) Insulation symbol for insulated lines. I) Piping spec break, if any (preferably be at flange joints/valves, each iso to contain only one spec). H) Sequence of branch connections (as agreed with Process in case of any changes). as specified in P&ID.į) Close/open position for spectacle blind or spacer & blind. of equipment, instruments, special items, actuated and manual valves (if applicable).Ĭ) Flow direction (including flow direction of check valve)ĭ) Slope/no pocket/free draining requirement, if any.Į) Min/max distances, straight lengths, etc. No.įollowing items are checked with the P&ID (IFD or later issue):ī) Tag nos. Here is a checklist for Piping Isometrics Sr.
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