Ministry of Chemical Industry Standards
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As we all know, there are different versions of standards issued by the Ministry of Chemical Industry over various years; for example, the standards for flanges vary from one year to another. Thank you
New standards will certainly have changes compared to the old ones; otherwise, there would be no need to introduce new standards.
Of course there is a difference; it’s just the new replacing the old.
“Functional Symbols and Graphic Icons for Process Measurement and Control Instruments” HG/T20505-2000; “Specifications for the Selection and Design of Automation Instruments” HG/T20507-2000; “Specifications for the Design of Control Rooms” HG/T 20508-2000; “Specifications for the Power Supply Design of Instruments” HG/T20509-2000; “Specifications for the Gas Supply Design of Instruments” HG/T20510-2000; “Specifications for the Design of Signal Alarm and Safety Interlock Systems” HG/T20511-2000; “Specifications for the Design of Instrument Piping and Wiring” HG/T20512-2000; “Specifications for the Grounding Design of Instrument Systems” HG/T20513-2000; “Specifications for the Heat Tracing and Insulation Design of Instruments and Pipelines” HG/T20514-2000; “Specifications for the Design of Automatic Analyzer Rooms” HG/T20516-2000; “Specifications for the Engineering Design of Distributed Control Systems” HG/T 20573-1995; “Specifications for the Design of Safety Instrument Systems in Petrochemical Industries” SH/T 3018-2003; “Measurement of Fluid Flow Rate in Circular Pipes Using Orifice Plates, Nozzles, and Venturi Tubes for Flow Measurement” ISO5167-2003(II); “Code for Design of Electrical Installations in Explosive and Flammable Environments” GB50058-1992; “Specifications for the Construction and Acceptance of Automation Instrumentation Projects” GB50093-2002; “Manual of Automation Control Installation Drawings” HG/T21581-1995; “Specifications for the Preparation of Engineering Design Documents for Automation Control Projects” HG/T20637-1998
When new standards are introduced, those new standards are applied, and the old standards become invalid. During design, the currently valid standard specifications must be followed; otherwise, the designed product will be unqualified.