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Design blind spots in electrical instruments

2011-08-05View Original

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Based on my experience in electrical instrument design, I have found that many organizations combine electrical and instrumentation tasks into a single discipline, which leads to unclear boundaries between them and results in design gaps. A complete set of electrical diagrams should include the following elements: (1) List of drawings; (2) Design specifications; (3) Summary table of electrical equipment; (4) Table of materials for electrical equipment; (5) Layout diagram of electrical cabinets; (6) Schematic diagram of power supply and distribution; (7) Control schematic diagram; (8) Lighting system diagram; (9) Terminal wiring diagram; (10) Cable inventory list; (11) Cable routing diagram; (12) Cable laying diagram; (13) System layout plan; (14) System wiring diagram. A complete set of instrumentation diagrams should include the following elements: (1) List of drawings; (2) Design specifications; (3) Summary table of instrumentation equipment; (4) List of instruments; (5) Summary table of installation materials; (6) Summary table of instrument components, along with a list of those components by part number; (7) Summary table of electrical materials; (8) Front view of the instrument panel; (9) Backside wiring diagram of the instrument panel; (10) Power supply system diagram; (11) Cable laying diagram; (12) Orientation diagram of troughs/cable trays; (13) Schematic diagrams of signals and interconnections; (14) Power supply schematic diagram; (15) Electrical control schematic diagram; (16) Schematic diagrams of control systems and detection systems; (17) Equipment layout plan and location diagram of primary points; (18) Calculations and data sheets for control valves and throttling devices; (19) Instrument system grounding; (20) Reused drawings; (21) Process flow diagram with control points; (22) Corporate standards of the design firm and installation manuals. Many organizations merge these two disciplines together, which often results in many diagrams being omitted in the final set of drawings. The current standards are also becoming less standardized. The above are my personal thoughts. Please discuss them together to see what other drawings are still missing.
Reply #22011-08-06
Electrical and instrumentation systems must be separated. . Other large companies separate strong current from weak current. Drawings? The lighting plan is missing. Emergency lighting system diagrams? They vary from place to place. I’m here to discuss it too
Reply #32011-08-09
This post was last edited by lavyour on 2011-8-9 15:31. It’s better to separate them. There are no lightning protection plans or fire alarm diagrams available.
Reply #42011-08-14
Thank you to the original poster for sharing; thanks for your hard work!
Reply #52011-08-27
Hello everyone – that’s really great:victory:
Reply #62011-08-28
Explosion-proof area layout diagram, power supply plan; some also include cable tray cross-section diagrams
Reply #72016-05-20
It’s time to part ways, but I can’t say why.
Reply #82016-05-25
P&ID diagrams are generally not created by instrumentation teams

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