GB/T 3396-2022 Determination of trace oxygen in ethylene and propylene for industrial use—Electrochemical method

GB/T 3396-2002 Ethylene and propylene for industrial use—Determination of trace oxygen—Electrochemical method

GB/T 3836.18-2024 Explosive atmospheres—Part 18:Intrinsically safe electrical systems GB 3836.19-2010 Explosive atmospheres—Part 19:Fieldbus intrinsically safe concept(FISCO) GB 3836.20-2010 Explosive atmospheres—Part 20:Equipment with equipment protection level (EPL) Ga GB/T 3836.21-2017 Explosive atmospheres—Part 21:Application of quality systems for equipment manufacture GB/T 3836.21-2022 Explosive atmospheres—Part 21:Application of quality management systemsfor Ex Product manufacture GB/T 3836.22-2017 Explosive atmospheres—Part 22:Protection of equipment and transmission system using optical radiation GB/T 3836.22-2023 Explosive atmospheres—Part 22:Protection of equipment and transmission system using optical radiation GB/T 3836.23-2017 Explosive atmospheres—Part 23:Group Ⅰ,category EPL Maequipment intended to remain functionalin atmospheres endangered by firedamp and/or coal dust GB/T 3836.24-2017 Explosive atmospheres—Part 24:Equipment protection by special protection“s” GB/T 3836.25-2019 Explosive atmospheres—Part 25:Requirements for process sealing between flammable process fluids and electrical systems GB/T 3836.26-2019 Explosive atmospheres—Part 26:Electrostatic hazards—Guidance GB/T 3836.27-2019 Explosive atmospheres—Part 27:Electrostatic hazards—Test GB/T 3836.28-2021 Explosive atmospheres—Part 28:Non-electrical equipment for explosive atmospheres—Basic method and requirements GB/T 3836.29-2021 Explosive atmospheres—Part 29:Non-electrical equipment for explosive atmospheres—Constructional safety “c”,control of ignition source “b”, liquid immersion “k” GB/T 3836.30-2021 Explosive atmospheres—Part 30:Equipment and components in explosive atmospheres in underground mines GB/T 3836.31-2021 Explosive atmospheres—Part 31:Equipment dust ignition protection by enclosure “t” GB/T 3836.32-2021 Explosive atmospheres—Part 32:Intrinsically safe systems with electronically controlled spark duration limitation GB/T 3836.33-2021 Explosive atmospheres—Part 33:Equipment in adverse service conditions GB/T 3836.34-2021 Explosive atmospheres—Part 34:Equipment assemblies GB/T 3836.35-2021 Explosive atmospheres—Part 35:Classification of areas for explosive dust atmospheres GB/T 3836.36-2022 Explosive atmospheres—Part 36:Electrical safety devices for the control of potential ignition sources from Ex Equipment GB/Z 3836.37-2025 Explosive atmospheres—Part 37:Equipment protection by 2-wire intrinsically safe ethernet concept (2-WISE) GB/T 6682-1992 Water for analytical laboratory use—Specification and test methods GB/T 6682-2008 Water for analytical laboratory use—Specification and test methods GB/T 8170-1987 Rules for rounding off of numberical values GB/T 8170-2008 Rules of rounding off for numerical values & expression and judgement of limiting values GB/T 13289-1991 Ethylene for industrial use—Sampling in the liquid and the gaseous phase GB/T 13289-2014 Ethylene for industrial use—Sampling in the liquid and the gaseous phase GB/T 13290-1991 Propylene and butadiene for industrial use—Sampling in the liquid phase GB/T 13290-2014 Propylene and butadiene for industrial use—Sampling in the liquid phase GB/T 34042-2017 General specification for on-line analyzer systems GB 50058-2014 Code for design of electrical installations in explosive atmospheres JJG 945-2010 Micro Oxygen Analyzers JJG 945-1999 Gas O2 Analyzer with Galvanic Cell SH/T 3081-2019 Design specification for instrumentation earthing in petrochemical engineering SH/T 3082 SH/T 3097-2017 Specification for design of static electricity earthing in petrochemical industry SH/T 3174