Checklist for P&ID Review (Offshore)
| Notes: | |||
|---|---|---|---|
| 1. This is a generic checklist for Typical offshore platform with all facilities. For projects containing only typical Wellhead facilities Platforms / Riser Platforms / Electrical facilities platforms etc.., this check list can be filtered out for relevant items or topics not required can be stroked-off.
2. The Checker shall complete and maintain this Check list for first and IFC issues. For intermediate issues, Revision Checklist shall be used unless there are major scope change. 3. The originator of the Drawing can use this checklist for self checking, but need not fill it. |
|||
| SL NO. | DESCRIPTION | ||
| GENERAL | |||
| 1 | All P&IDs are available with index and document numbers as per index sheet | ||
| 2 | Legend P&ID cover information about all the line services, abbreviations, symbols, Piping/Instrumentation/Equipment (like sample stations, level instruments) which are used in P&ID are matching. | ||
| 3 | Missing / Incomplete information like Line numbers, Tag numbers, Flow directions, Instrument details, Equipment details, Trim details, Continuation P&ID etc. | ||
| 4 | Whenever the pipe class (spec) changes, the line shall be allotted a different unique line number. | ||
| 5 | All line numbers mentioned with spec, rating, and insulation requirement. | ||
| 6 | Notes are complete, clear. Impact on piping/ layouts reviewed and commented if required | ||
| 7 | Highlight any tag numbers, line numbers are repeating. | ||
| 8 | P&ID holds are reviewed for impact in Piping/ Layout | ||
| 9 | New line number provided whenever there is spec change, branches | ||
| 10 | Check Spec Breaks, Pressure ratings, Insulating Gasket requirement. | ||
| 11 | Check number of equipment, type of equipment, design conditions of equipment, equipment sizes are matching with mechanical/process data sheets | ||
| 12 | Compare with Process flow diagram(PFD) | ||
| 13 | Piping Specialties are identified and numbered | ||
| 14 | Check instrumentation requirements impacting Piping/Layout (Upstream -Downstream straight run requirements, Level requirements) | ||
| 15 | Tracing / Heating requirements for Pipes and Equipment | ||
| 16 | P&ID are reviewed with Piping Material Specifications (PMS) requirements. | ||
| 17 | Check all instruments with tags and tag numbering are as per legend | ||
| 18 | Check the type of instrument used is matching with instrumentation hook up | ||
| 19 | Scope breaks identified (like Company/Vendor/Instrumentation/ existing /new project scope/ by others) | ||
| 20 | Scope breaks and Spec breaks between piping and pipeline | ||
| 21 | Check all equipment numbers, names, sequence, type of equipment and any maintenance requirement specific to process is mentioned in P&ID | ||
| 22 | Check all instruments are placed on equipment as per vendor requisition | ||
| 23 | Check Separate Line numbers should be given not only wherever there is a change of pipe class but also where the design conditions of the line change. | ||
| 24 | Check center line elevation is given for horizontal vessels, pump nozzles, Manways, instrument nozzle heights etc. | ||
| 25 | Check revisions are cleared marked and consistent | ||
| 26 | Check Gravity flow, Slope, Free draining/ No Pockets requirements | ||
| 27 | Check Drain funnel requirement (Number of open drain funnels) | ||
| 28 | Check Removable break-up spool requirement | ||
| 29 | Check the insulation type and insulation thickness requirement for Pipes and Equipment | ||
| 30 | Review process vent and drain requirement | ||
| 31 | Check valve types used (special attention for requirement of Full bore Ball Valves, Wafer/Lug/Lug/Swing Check valve) | ||
| 32 | Check type of valve required in line and valve position and condition etc. | ||
| 33 | Check the line size and rating where temperature gauges located | ||
| 34 | Check Reducer provision for control valves, PSVs, Equipment Nozzles | ||
| 35 | Review Branch locations, Sequences, Line connections based on layouts | ||
| 36 | check PSV size, line rating, stand by provision and any bypass requirement is provided | ||
| 37 | Check Strainers details(type, orientation) | ||
| 38 | Check possibility of Tie ins at suggested locations based on existing material, pipe thickness, flange rating, site conditions. | ||
| 39 | Check manual valves with mechanical interlock & specified | ||
| 40 | check provisions and locations for chemical injection(CI, Wax, PPD, Biocide) | ||
| 41 | Check tundish requirement (with SP numbers) near Process vessels | ||
| 42 | Check for bunding requirement for Process vessels (when process vessels is not mounted on skid) & utility tanks | ||
| 43 | Check sampling station details at legend sheet | ||
| 44 | Check straight run requirement for example pumps, flow elements, vessel, compressors etc. | ||
| 45 | Check diaphragm type instruments are used in dirty services | ||
| 46 | Check the requirement of metal seated Ball valves, Target tees and sand probes in well fluid services containing sand. | ||
| 47 | Check notes, details for purging, flushing, rodding, cleaning requirements. | ||
| 48 | Preferred Slope of the Main Rack headers could be 1:300 or 1:500. | ||
| 49 | Preferred slope values on branch lines could be around 1:200 or 1:333. | ||
| 50 | Line slope values mentioned on P&ID for long headers should be verified (by studying structural arrangement) before implementation. | ||
| 51 | Process to show all pump vents & drains on the P&IDs as per Pump vendor drawings. | ||
| 52 | Spec break shall be only at the flange joints even if it is indicated otherwise in the P&IDs & there are no dissimilar metal welded at spec breaks | ||
| 53 | Drip pans requirement pig traps & SP number allocation of them | ||
| 54 | If dissimilar materials cannot be avoided then use a design that will prevent galvanic corrosion, that is could be insulation assembly (inert Ring Joints and bolts). | ||
| 55 | all Instrument /Piping- CS/SS scope breaks shall be provided with insulating kit | ||
| 56 | Check Strainer requirement downstream of Rupture Disc (Fragment type) | ||
| 57 | Upstream & Downstream straight length requirement for special fluid measurement devices. Such as Venturi Tubes, Flow Nozzles, Electro Magnetic Flow meters, Ultrasonic Doppler flow meter, Mass flow meter etc. | ||
| 58 | Slopes for launchers/ receivers Identified correctly | ||
| 59 | See feasibility to convert welded tie-ins to flanged as per Site conditions | ||
| 60 | Compare Tie-in numbers and locations in construction and demolition P&ID | ||
| 61 | Review demolition scope in Demolition P&IDS (in project scope or by others) | ||