P&ID Checklist
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Transcript of P&ID Checklist
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P&ID CHECKLIST:
General:
Ensure P&IDs are not crowded: Normally do not show more than 4 pieces of
equipment per P&ID
Verify the P&ID matches Process Flow Diagram (PFD) connectivity
Verify spec breaks over valves/PSVs, steam and electrical tracing are shown
Verify all equipment numbers and specs agree with process data sheets or
specifications and equipment list
Verify insulation requirement for piping, equipment and instruments are shown where
required
Verify piping, valve, equipment and instrument symbology and numbering. Verify
symbology against standard legend, symbols and instrument interface
Include notes for any items rotated for easy access, such as handwheels on valves, to
ensure they are rotated to an angle that is possible considering the number of bolt
holes on the lines. (Ex: per ASME B16.5 I see that for 150# carbon steel, 0.5″ to 3″
lines can rotated 90 degrees , 4″ to 8″ lines can rotate 45 degrees , 10″ to 14″ can
rotate 30 degrees)
Verify revision, purpose of revisions, numbering, and P&ID title
Show notes whenever any items must be within sight of each other (e.g. ensure level
gauge can be seen by someone operating this manual globe valve)
Verify notes for reference drawings (including Decommissioning/Removal P&IDs)
Verify all Notes/Holds are relevant. Is it clear what they refer to? Spellings correct?
Are the general project notes and holds, which must be added to each drawing, in
place?
Verify utility P&IDs tie in correctly to main drawings, and show connection to utility
stations & analysers
Verify all the mark-ups were applied by the drafters correctly, spellings all correct
Check the drafting process did not introduce any random new errors or mistakes away
from areas revised/marked-up
Verify revision triangles, clouds, and other markings in the revision process are added
or deleted as required
Verify provisions for future expansion are shown, if anticipated
Check for company’s document/drawing number
Check for client document number
Check for licensor/Vendor document number
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Verify that title block By/Approved/Checked are blocks filled and signed. Date,
Revision, all company logos, and client signoff blocks are shown. Verify P&IDs are
properly signed
Conduct a pre-HAZOP of processes in each P&ID or related P&IDs
Conduct a pre-Constructability review
Clear all HOLDs before final issue.
Process lines:
Verify line number, cross check with line schedule and sizing. Verify pipe specs are all
shown and correct
Verify line arrows are on each turn of a line, in the correct direction
Verify lines connecting to a main flare line connect to that line from above, even
making a detour if necessary to ensure proper drainage
Show tie Points are at all old/new line interfaces and ensure the tie-in schedule
revision agrees with the P&ID revision
Verify branching or reducing lines connect to each other according to project’s piping
branch table
Verify header line numbers include all header block valves (so that when the header is
built the block valves are installed with the header, not any branch lines)
Ensure when process lines cross, vertical lines break for horizontal lines. But
instrumentation lines break for process lines except specified otherwise
Verify reference to other P&IDs and line continuity through off-page connectors.
Alignment of OPCs is important
Stream tags include the fluid and drawing number. Note where the equipment name
the stream is from/going to
Verify, where applicable, streams come in the left side and go out the right side of
P&IDs
Show slopes and elevations where required
Verify all battery limits are clearly marked
Instrumentation lines:
Verify instrumentation signal lines are correct line type, local/DCS code correct
Verify complete instrumentation and control loops are shown on the P&IDs
Instrumentation:
Instruments are right type, local/transmitted, control type, block/bypass valves shown
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Verify if instrumentation details is as per job specification (isolation valve size and
spec., vent & drain requirements, etc.)
Verify that Cause-and-Effect/Safe Chart requirements are clearly represented
Valves:
Verify Control valve type, failure mode shown, block/bypass valves, reducers, the sizes
used are the latest from controls department
Verify Pressure Relief Valves are correct. Verify set pressure, PSV size is latest
calculated, inlet/discharge size and pipe spec match latest calculations, outlet lines are
Car Sealed Open or have no valves (if to atmosphere), the relief outlet goes to
drain/flare/atmosphere
Verify block valves show if they are normally open or closed, car sealed open or
closed?
Verify drain valves present, use smaller gate valve symbol, they are between
checks/gates/etc
Verify minor valves are placed logically (check valve near pump discharge, swing blind
near a gate valve)
Verify spectacle blinds are correctly shown normally open/closed and they are on the
side of the valve facing the “danger” (i.e. pressure source, contamination source)
Verify double-block valves are shown (with 3/4″ drain between) where procedures say
they are needed i.e.600 psig+ or for hazardous fluids like acids
Verify consistency of double block and bleed
Verify proper valving for drain and relief valves
Verify all sizes are indicated and match the process calculations: control valves, relief
valves, by pass…
Verify low temperature impact if expansion (control valve, relief valve,
depressurization)
Verify operability for start-up, opening of valve with high differential pressure
especially riser valves
Verify that working range of control valve is adequate or needs split-range
Verify if failure position of shutdown and control valves are shown
Verify any by-pass requirements and appropriate valving is shown
Verify if full bore and reduced bore ball valves are indicated where appropriate
Equipment and vessels:
Verify all equipment tags and titles above equipment show spelling of names correctly
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Verify stream tags include the fluid and drawing number. Note the equipment name
and where the stream is from/going to
Verify equipment names match other documents like the PFD, equipment list,
datasheet, etc.
Verify isolation of equipment (spectacle blind, double block and bleed) with job
standard
Verify equipment, data and level diagrams are filled in and match the process
calculations
Verify 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
Vessels should show – Size, design temperature/design pressure, full vacuum,
internals/levels, skirt height to grade
Verify all the set points are indicated
Heat exchangers should show – Area, design temp/pressure, duty, motor horsepower
(air coolers), condenser/reboilers have elevation, motors have controls
Heater should show – size, duty, design T/P, coil arrangement, utilities on a separate
page
Boiler should show – size, design T/P, superheater outlet T, utilities own page
Tank should show – size, capacity, type, heaters/agitators shown
Pump should show – rated flow, horsepower, and differential head. Showing temporary
strainers, drains, motor w/ controls
Turbines should show – in/out temp/pressure, horsepower, strainers
Compressors should show – Actual Cubic Feet per Minute inlet, discharge pressure,
driver type, horsepower, strainer, lube/seal oil
Verify steam outs/steam connections are where required and show full vacuum rating
on equipment when required
Verify limit of package, limit of supply / vendor scope
Verify all SP items are indicated
Verify that all installation requirements are shown: i.e. no slope, high point, min.
straight length, no pocket, min. length, etc.