P & ID Check ListThe following shall be considered in P & ID Check List

-Verify revision, purpose of revisions, numbering, title.

-Verify notes reference drawings (including Removal P&IDs)

-Verify “holds” are indicated

-Verify piping spec break

-Verify line number, cross check with line schedule and sizing

-Verify all sizes are indicated and match the process calculations : control valves, relief valves, by pass…

-Verify limit of package, limit of supply

-Verify that all installation requirements are shown : no slope, high point, min. straight length, no pocket,

min. length, etc.

-Verify low temperature impact if expansion (control valve, relief valve, depressurization)

-Verify insulation requirement for piping, equipment and instruments are shown including pp/acoustic

-Verify proper valving for drain, relief valves

-Verify isolation of equipment (spectacle blind, double block and bleed) with job standard

-Verify consistency of double block and bleed

-Verify operability for start-up, opening of valve with high differential pressure especially riser valves

-Verify any by-pass requirements and appropriate valving

-Verify that working range of control valve is adequate or need of split-range

-Verify requirements of API 14C are fulfilled (safe chart) (for offshore projects)

-Verify all SP items are indicated

-Verify equipment, data and level diagrams are filled in and match the process calculations

-Verify piping, valve, equipment and instrument symbology and numbering.  Verify symbology against

standard legend, symbols and instrument interface (if applicable)

-Have IDC been done.

-Have all design changes been included

-Have all changes clouded, previous ones removed

-Verify reference to other P&IDs and line continuity

-Are P&IDs properly signed

-Are all the set points indicated

-Have all other discipline comments been entertained

-Are all tie-in points shown and does the tie-in schedule revision agree with the P&IDs

-Do all equipment numbers and specs. Agree with process data sheets or specifications and Equipment list

-Verify all the nozzles of an equipment including drain, vent, manholes etc. have been shown

-Verify provisions for future expansion is kept, if the same is anticipated

-Are complete instrumentation and control loops shown on the P&IDs

-Verify if instrumentation details is as per job specification (isolation valve size and spec., vent & drain

requirements, etc.)

-Verify if failure position of shutdown and control valves are shown

-Verify if full bore valves are indicated