【Safety Management and Standardization of Special Equipment】- What exactly does a component assembly device in special equipment refer to? How to regulate?

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Ensure proper safety management of special equipment – Standardization ensures safety! [Special Equipment Safety Management and Standardization] – Comprehensive summary post! Constantly being updated – feel free to communicate! ! ! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=5718553 (Source: Haichuan Chemical Industry Forum (Hua Haichuan Liu hcbbs)). Everyone is welcome to participate in the discussions--------------------------------------------------------- What exactly does a component assembly device in special equipment refer to? How to regulate? In pressure pipeline systems, there is a special type of equipment known as “component assembly units”. They are not single pipe components, but rather devices with specific functions, formed by the pre-assemblage of multiple components (such as valves, fittings, instruments, etc.) in a factory into a single unit. According to the \"Announcement by the State Administration for Market Regulation on Matters Related to Administrative Licenses for Special Equipment\" (No. 41, 2021) and the \"Rules for Supervision and Inspection of Pressure Pipelines\" (TSG D7006-2020), pressure pipeline component assemblies are classified into seven major categories. This article provides a detailed introduction to the definitions, components, and performance standards of these seven types of devices, as well as the differentiated regulatory requirements among them. I. Definition and Composition of Seven Types of Component Assembly Devices. A component assembly device refers to a device that possesses certain functions, formed by combining pressure pipeline components such as pipes, fittings, valves, flanges, compensators, and sealing elements. This includes wellhead devices and production trees, throttle and kill manifolds, gas pressure regulation devices, temperature and pressure reduction devices, flame arresters, flow meter housings, and prefabricated pipe sections manufactured in factories. 1. Gas pressure regulating device Definition: A gas pressure regulating device is a piece of equipment that automatically adjusts and stabilizes a higher inlet pressure to a lower outlet pressure, and it is widely used in urban gas distribution systems. It usually consists of a pressure regulator, filter, safety valve (or cut-off valve/relief valve), valves, pressure gauge, and connecting pipes, etc., to ensure a stable and safe gas supply pressure. The relevant safety technical specifications and standards include TSG D7004-2010 \"Rules for Periodic Inspection of Pressure Pipelines – Public Pipelines\", TSG D7006-2020 \"Rules for Supervisory Inspection of Pressure Pipelines\", GB/T 38942-2020 \"Codes for Pressure Pipelines – Public Pipelines\", GB 55009-2021 \"Codes for Gas Engineering Projects\", GB 50028-2006 \"Code for Design of Urban Gas Systems\" (2020 edition), GB 27791-2020 \"Pressure Regulating Boxes for Urban Gas\", and GB 27790-2020 \"Pressure Regulators for Urban Gas“. 2. Temperature and pressure reduction devices: Definition: Temperature and pressure reduction devices are used to reduce the parameters (temperature and pressure) of high-temperature, high-pressure steam to the values required by the process or heating applications. It usually consists of a pressure reduction system (pressure relief valve), a temperature reduction system (feed water control valve, nozzle), a safety protection system (safety valve), as well as pipes and instruments, and is widely used in industries such as thermal power and chemicals. The relevant safety technical specifications and standards include NB/T 47033—2023 \"Temperature and Pressure Reducing Devices\", TSG 11—2020 \"Safety Technical Regulations for Boilers\", GB/T 10868—2019 \"Temperature and Pressure Reducing Valves for Power Plants\", GB/T 10869—2019 \"Control Valves for Power Plants\", JB/T 3595—2002 \"General Requirements for Valves in Power Plants\", and TSG D7006—2020 \"Rules for Supervisory Inspection of Pressure Pipelines\". 3. Flame arrestors: Definition: A flame arrester is a safety device installed in pipelines to prevent the propagation and spread of flames. Its core component is the flame arrestor element (such as corrugated plates, metal mesh, etc.). When a flame passes through, this flame arrestor absorbs heat and extinguishes the flame, thereby preventing backfire from causing an explosion. Composition: It mainly consists of a housing, a flame arrestor core element, and connecting parts. The relevant safety technical specifications and standards include GB 5908—2024 \"Flame Arresters\", TSG D7002—2006 \"Rules for Type Testing of Pressure Pipeline Components\", TSG D7006—2020 \"Rules for Supervisory Inspection of Pressure Pipelines\", TSG 31—2025 \"Safety Technical Regulations for Industrial Pipelines\", GB/T 20801.6—2020 \"Code for Pressure Pipelines – Industrial Pipelines, Part 6: Safety Protections\", and SH/T 3413—2019 \"Standards for Selection, Inspection, and Acceptance of Flame Arresters for Petrochemical and Oil Pipelines\". 4. Flowmeter (housing): Definition: The flowmeter housing refers to the casing that is manufactured by machining or welding pipes, rolled sheets, castings, forgings, etc., and is used to withstand the pressure of the medium inside the flowmeter; it constitutes a pressure-bearing component. It must have sufficient strength and sealing performance to ensure safe operation under operating conditions. There are numerous structural types of flowmeters. For flowmeter housings that contain welds, poor control over the quality of welding during their manufacturing process can affect the safety of use of such flowmeters; therefore, manufacturing inspections are carried out on these types of housing. Manufacturing inspection is not required for flowmeters without pressure housings (such as insert type flowmeters and flange-clamped flowmeters), as well as those with integrally cast flowmeter housings or housings made from non-ferrous metal fittings. The relevant safety technical specifications and standards include TSG D7002—2006 \"Rules for Type Testing of Pressure Pipeline Components\", TSG 31—2025 \"Safety Technical Regulations for Pressure Pipelines – Industrial Pipelines\", TSG D7006—2020 \"Rules for Supervisory Inspection of Pressure Pipelines\", TSG 11—2020 \"Safety Technical Regulations for Boilers\", T/CASEI 012—2022 \"Specifications for Supervisory Inspection of Flow Meters (Housings) Used in Pressure Equipment\", GB/T 30439.5—2013 \"Safety Requirements for Industrial Automation Products – Part 5: Safety Requirements for Flow Meters\", and GB 50093—2013 \"Specifications for Construction and Quality Acceptance of Automation Instrumentation Projects\". 5. Factory-prepared pipe sections: Definition: Factory-prepared pipe sections refer to pipeline products that are welded and assembled into a complete unit in a factory based on the construction design drawings, including pipe fittings, valves, flanges, compensators, etc., and are delivered from the factory; this does not include pipe preparation carried out by the installation unit at the construction site. Common prefabricated pipe sections include manifolds, filters, separators, condensate (gas) tanks, strainers, mixers, buffers, ball receiving and sending cylinders, dip pipes, etc. Safety technical specifications and standards involved:
I. Mandatory supervision specifications for special equipment (to be complied with):
TSG D7002—2006 “Rules for Type Testing of Pressure Pipeline Components”
TSG D7006—2020 “Rules for Supervisory Inspection of Pressure Pipelines”
TSG 31—2025 “Safety Technical Regulations for Pressure Pipelines – Industrial Pipelines”
TSG 11—2020 “Safety Technical Regulations for Boilers”
GB/T 20801.1—2025 “Code for Pressure Pipelines – Industrial Pipelines, Part 1: General Provisions”
GB/T 20801.2—2020 “Code for Pressure Pipelines – Industrial Pipelines, Part 2: Materials”
GB/T 20801.3—2020 “Code for Pressure Pipelines – Industrial Pipelines, Part 3: Design and Calculation”
GB/T 20801.4—2020 “Code for Pressure Pipelines – Industrial Pipelines, Part 4: Fabrication and Installation”
GB/T 20801.6—2020 “Code for Pressure Pipelines – Industrial Pipelines, Part 6: Safety Protections”
GB/T 45472—2025 “Prefabricated Insulated Pipes for Overhead and Integrated Utility Tunnels”
6. Wellhead devices and Christmas trees: Definition and functions: Wellhead devices and Christmas trees are key equipment in the drilling and production of oil and gas; they are installed at the wellhead to control and regulate the pressure and flow rate of oil and gas wells. The wellhead equipment is used to suspend the casing and tubing, and to seal the annular space between the casing and tubing ； The Christmas tree is installed above the wellhead equipment and consists of valves, tees, crosses, etc.; it is used to control the flow of oil and gas as well as for testing and maintenance tasks. Main components: casing head, tubing head, casing hanger, tubing hanger, valves, tees, crosses, connectors, gasket rings, etc. The relevant safety technical specifications and standards include GB/T 22513-2023 \"Oil and gas drilling and production equipment – Wellhead devices and Christmas trees\", SY/T 5127-2002 \"Specifications for wellhead devices and Christmas trees\", TSG D7002-2006 \"Rules for type testing of pressure pipeline components\", TSG 31-2025 \"Safety technical regulations for pressure pipelines – Industrial pipelines\", and GB/T 31033-2025 \"Technical requirements for well control in oil and gas drilling\". Section 7: Throttling and kill manifold – Definition and function: The throttling and kill manifold is a core component of the pressure control system for oil and gas wells, and it is primarily used to control well pressure during drilling and prevent blowouts. The throttle manifold controls the backpressure through a throttle valve, maintaining the pressure at the bottom of the well slightly above the formation pressure ； The kill manifold is used to pump weighted drilling fluid into the well when normal circulation through the drill string is not possible, in order to control the well pressure. Main components: throttle valve, gate valve, pipelines, manifolds, pressure gauge, sensors, throttle manifold control box, check valve, etc. The relevant safety technical specifications and standards include GB/T 31033-2025 \"Technical Requirements for Well Control in Oil and Gas Drilling\", AQ 2084-2025 \"Safety Specifications for Downhole Operations in Onshore Oil and Gas Wells\", SY/T 5323 \"Oil and Gas Industry – Drilling and Production Equipment – Throttling and Well Control Equipment\", TSG D7002-2006 \"Rules for Type Testing of Pressure Pipeline Components\", and TSG D7006-2020 \"Rules for Supervisory Inspection of Pressure Pipelines\"