Thursday, August 4, 2011


Actually I have already issued the check list of Isometric drawings but may be this info as per your reference during check list th isometric drawings and General Arrangement Drawings.
Every Company may be have different style to make the check list of drawings. But I thick for us is followed only for which is the best to check list and We already joint on that company I suggest we used the standard check list from company.
This nfo of check list I got from internet and I forgot where I got this information.

• Title Block.

• North Arrow Orientation.

• Matchline Continuation.

• Line Continuation.

• Equipment Location To Grid.

• Equipment Nozzle Details (No., Size & Rating).

• Pipeline Location To Grid/Equipment. By Piping Or Valves).

• Structural Penetrations.

• Locations Of Item.

• Pipeline Elevations Shown.

• Dimensional Completion.

• Valve Orientation. (is enough space provided for:)

• Electrical And Instrument Cable Trays And Junction Boxes.

• Erection Of Equipment.

• Tube Bundles.

• Maintenance Space (Including Choke And Safety Valves).

• Equipment Removal.

• Operating Space.

• Manway Clearance.

• Davit Dropping.

• Overhead Clearance.

• Future Installation Area.

• Ducting And H.V.A.C. Equipment.

• Platforms And Walkways (I.E. Not Blocked By Piping Or Valves)

• Do Drawing Comply With Piping & Instrument Diagrams And Line List

• Direction Of Flow And Flow Arrows.

• Valve And Specialities In Each Line.

• Instrument Conn's In Lines And Equipment.

• Steam/Electric Tracing.

• Insulation.

• Equipment Numbers And Titles.

• Completeness Of Lines.

• Pipeline Numbers.

• Instrument Tag Numbers.

• Valve Tag Numbers.

• Vapour And Gas Lines Without Pockets.

• No Inverted Pocket In Suction Line


· Title block.

· North arrow orientation.

· Line continuation - Iso index.

· Matching isometrics and elevation.

· Equipment location to grid.

· Equipment terminal details.

· Location to grid/equipment.

· Structural penetrations.

· Locations of item .

· Line content.

· Flow arrow.

· Pipeline number and elevations.

· Fabrication type.

· Dimensional completion.

· Valve orientation.

· Fabrication limits.

· Field weld locations.

· Make-up weld locations.

· Cut to fit dimensions.

· Spool number sequence.

· Pipe support locations.

· Hydrotest requirements.

· Flushing requirements.

· Insulation limits.

· Heat tracing limits.

· Piping bills of materials completeness.

· Piping insulation materials completeness.

· Specials list completeness.

· Assemblies list completeness.

· Tagged item list completeness.

· Fabrication requirements completeness.


Valves are best installed with the stem pointing staright-up (Vertical stem). Since this position greatly facilitates in-place maintenance (lubrication, inspection & repacking)

Valves may be rotated as far as the horizontal position with no great decrease in maintenance convenience. But should not be installed with the stem downward since the bonnet acts as a trap for acrasive sediment and water wich may freeze under extreme climatic conditions.

Safety (operation & maintenance ) requires that valves be placed over platforms, rather than adjacent to them. Valves can be placed over access area if they comply with horizontal stem limitations and area bove 2100 min head clearance.

KL Chow Kit,  4 August 2011 time : 5.55 AM.

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