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Checklist for P&ID Review (Offshore)

Checklist for P&ID Review (Offshore)

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.

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)

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