Inter Discipline Check (IDC) is an activity done by Design Engineers in Plant Design Companies. IDC is performed to ensure that the design and engineering output including supplier documentation is meeting the project design requirements by all related internal disciplines.
Inter Discipline Check (IDC) Here we shall see which things to check from other discipline’s documents as an Instrumentation Engineer .
Chemical or Process DOCUMENT – P&ID Points to Check:
Instrument legend as per client / ISA standard (mainly for valves and flowmeters) Process connection type and size Instrument signal type identification – BPCS , SIS Addition / Deletion of Specific notes Line type – pneumatic, signal line, etc Instrument Scope clarification – Vendor vs client, existing vs new instrument Isolation valve requirement check Instrument tagging Representation Mechanical DOCUMENT – VENDOR PACKAGE SPECIFICATION Points to Check:
Preferred PLC make Preferred Communication Protocol HMI/SCADA Control Panel Enclosure MOC Interconnecting Cabling, Earthing cables, Wiring, and other Instrument items within the skid All interconnecting tubing within the package. Necessary Instrumentation & Controls, Instrumentation including interconnecting cable and safety devices Inter Discipline Check Skid/Packages Points to Check:
Skid-mounted Junction boxes (as per SUPPLIER design) & interconnecting cabling for Instruments within the skid Integration of skid/Package wiring in case of delivered in various sections/parts Support to DCS Vendor Specific Requirement i.e. IBR Certification for Boiler DOCUMENT – Equipment GA/Datasheet/VDR Points to Check:
Process Connection type – size Cross-check with P&ID data & ensure data alignment in both the documents Instrument Installation check i.e. Nozzle orientation for RADAR transmitter, support arrangement for capacitance type level switch The requirement of Remote transmitter (internal point- I&C doc will be updated) Check MOC – Optional The requirement of Thermowell for Temperature measurement DOCUMENT – Equipment Layouts Points to Check:
JB / RIO / Control panel Installation (input) Pipe Rack Requirements (input) Cable tray support Requirements (input) Common Points to Check:
Cable tray routing inside the building Control panel/JB near equipment/skid, conduit routing, instrument air tubing Piping DOCUMENT – 3D MODEL REVIEW Points to Check:
Basic Instruments connection details Cable tray routing on Pipe rack Instruments as per hook up drawings Civil and Structure DOCUMENT – LAYOUTS Points to Check:
Wall/Floor cut-out for cable tray routing Electrical DOCUMENT – LOAD LIST/LAYOUTS Points to Check:
No of motors as per P&ID as Signal consideration for IO list Cable tray layouts Earth pit layout Electrical room layout Lighting Layout Author: Kalpit Patel
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