137210967 p id designer s checklist
DESCRIPTION
PITRANSCRIPT
Detailed Engineering Drawings, Codes and Standards
PIPING & INSTRUMENTATION DIAGRAM – DESIGNER CHECKLIST
S/N CHECK ITEM DESCRIPTION
1 My company’s document/drawing #
2 Client document #
3 Licensor/Vendor document #
4 Title block: including the By/Approved/Checked blocks filled and
signed, Date, Rev. all company logos, client signoff block?5 All equipment tagged, title above equip, spelling of names
correct?6 Not crowded: Normally have about 4 pieces of equipment per
drawing7 Where feasible, streams come in the left side and go out the
right side fo the drawing. Battery limits are marked. Stream
tags include the fluid, drawing #, note the equipment name and
tag the stream is from/going to8 Line arrows are on each turn of a line, in the correct direction?
9 Vessels – Size, design temperature/design pressure, full
vacuum, internals/levels, skirt height to grade10 Heat exchangers – Area, design temp/pressure, duty, motor
horsepower (air coolers), condenser/reboilers have elevation,
motors have controls11 Heater – size, duty, design T/P, coil arrangement, utilities on a
separate page12 Boiler – size, design T/P, superheater outlet T, utilities own page
13 Tank – size, capacity, type, heaters/agitators shown
14 Pump rated flow, horsepower, differential head. Showing
temporary strainers, drains, motor w/ controls15 Turbines – in/out temp/pressure, horsepower, strainers
16 Compressor – Actual Cubic Feet per Minute inlet, discharge
pressure, driver type, horsepower, strainer, lube/seal oil17 Instruments are right type, local/transmitted, control type,
block/bypass valves shown18 Instrumentation signal lines are correct line type, local/DCS
code correct19 Control valve type, failure mode shown, block/bypass valves,
GE200 CourseHandout – P&ID Designer’s Checklist
Detailed Engineering Drawings, Codes and Standards
reducers, the sizes used are the latest from controls department20 Pressure Relief Valves: set pressure, PSV size is latest,
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/atmosphere21 Lines connecting to a main flare line connect to that line from
above, even making a detour if necessary. (This is an old
drafter’s trick to remind pipers that flare lines need to slope
downward to drain properly)22 Block valves: show if they are normally open or closed, car
sealed open or closed?23 Drain valves present, use smaller gate valve symbol, they are
between checks/gates/etc.24 Minor valves are placed logically (check valve near pump
discharge, swing blind near a gate valve)25 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)26 Steam-outs/steam connections where required? Full vacuum
rating on equipment when required27 Pipe specs. are all shown and are correct, spec. breaks over
valves/PSVs, steam and electrical tracing is shown28 Double-block valves (with 3/4″ drain between) where
procedures say there are needed (normally 600 psig+ or
dangerous fluids like acid)29 Insulation is shown on equipment and pipes?
30 Tie Points are at all old/new line interfaces
31 Lines connect to each other according to project’s branch table
(e.g. do I need to show an expander before tee?)32 Show slopes, elevations,
33 Note 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)34 Utility P&IDs tie in correctly to main drawings, and show
connect to utility stations & analyzers35 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)36 Any items rotated for easy access, such as handwheels on
valves, are rotated to an angle that is possible considering the
GE200 CourseHandout – P&ID Designer’s Checklist
Detailed Engineering Drawings, Codes and Standards
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)37 Neat DWG, no dog-legs/bad-connections
38 When lines cross, vertical lines break for horizontal lines except
that instrumentation lines break for process lines. (This rule
varies by company)39 Matches Process Flow Diagram (PFD) connectivity,
40 Equipment names match other documents like the PFD,
equipment list, datasheet, etc.41 All Notes/Holds are ok? Is it clear what they refer to? Spelling?
Are the general project notes and holds, that must be added to
each drawing, in place?42 All the mark-ups were applied by the drafters correctly, spelling
is correct43 Check the drafting process did not introduce any random new
errors or mistakes. (Sometimes during a revision, a drafter’s
template will be set wrong, or a line type will change for no
apparent reason, causing a little mistake. And no one will be
looking for it, because everyone just focuses on the areas that
were marked up!)44 Are revision triangles, clouds, and other markings in the revision
process added or deleted as required?45 Do your own mini-HAZOP of the process: can any deviation in
normal temperature, pressure, flowrate, operator mistakes,
utility failures, etc. cause a safety problem? Are any remaining
safety issues going to be properly documented for the operators46 Similarly, can you think of any operability problems? Any
common maintenance tasks that cannot be done here? Or any
practical problems building or installing what you’ve planned?47 Taking a look at the set of P&IDs as a whole, the stream
connections between the drawings are correct (all inlet streams
match to outlet streams somewhere, or at least has an
adequate explanation)
GE200 CourseHandout – P&ID Designer’s Checklist