Detail of GB/T 28185-2025

Introduction of GB/T 28185-2025

GB/T 28185-2025 Heat exchange unit for urban heating 1 Scope This document specifies the classification and type, general provisions, technical requirements, test methods, inspection rules, markings, instructions for use, product certificate, packaging, transportation and storage of heat exchange unit for urban heating (hereinafter referred to as “heat exchange unit”). This document is applicable to the design, production and inspection of heat exchange units used in heating (cooling) heat exchange systems with design pressure not greater than 2.5MPa, hot water temperature not greater than 150℃ and steam temperature not greater than 350℃. 2 Normative references The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 151 Heat exchangers GB/T 700 Carbon structural steels GB/T 706 Hot-rolled section steel GB/T 2518 Continuously hot-dip zinc and zinc alloy coated steel sheet and strip GB 3096 Environmental quality standard for noise GB 4208-2017 Degrees of protection provided by enclosure (IP code) GB/T 5338.1 Series 1 freight containers - Specification and testing - Part 1: General cargo containers for general purposes GB/T 5656 Technical specifications for centrifugal pumps - Class II GB/T 5657 Technical specifications for centrifugal pumps - Class III GB 5749 Standards for drinking water quality GB/T 7251.1 Low-voltage switchgear and controlgear assemblies - Part 1: General rules GB/T 7251.2 Low-voltage switchgear and controlgear assemblies - Part 2: Power switchgear and controlgear assemblies GB/T 7251.3 Low-voltage switchgear and controlgear assemblies - Part 3: Distribution boardsintended to be operated by ordinary persons (DBO) GB/T 7251.5 Low-voltage switchgear and controlgear assemblies - Part 5: Assemblies for power distribution in public networks GB/T 7251.6 Low-voltage switchgear and controlgear assemblies - Part 6: Busbar trunking systems (busways) GB/T 7251.8 Low-voltage switchgear and controlgear assemblies - Part 8: General technical requirements for intelligent assembly GB/T 7251.10 Low-voltage switchgear and controlgear assemblies - Part 10: Guidance to specifying assemblies GB/T 7306.2 Pipe threads with 55 degree thread angle where pressure-tight joints are made on the threads - Part 2: Taper internal and external threads GB/T 8163 Seamless steel tubes for liquid service GB 8624-2012 Classification for burning behavior of building materials and products GB/T 9124.1 Steel pipe flanges - Part 1: PN designated GB/T 9125.1 Fasteners for steel pipe flange joints - Part 1: PN designated GB/T 9330 Plastic insulated control cables GB/T 9969 General principles for preparation of instructions for use of industrial products GB 10071 Measurement method of environmental vibration of urban area GB/T 12235 Steel globe valves and lift check valve for petroleum, petrochemical and allied industries GB/T 12236 Steel swing check valve for petroleum petrochemical and allied industries GB/T 12237 Steel ball valves for petroleum, petrochemical and allied industries GB/T 12238 Flanged and wafer resilient seal butterfly valves GB/T 12243 Spring loaded safety valves GB 12348 Emission standard for industrial enterprises noise at boundary GB/T 12459 Steel buttwelding pipe fittings—Types and parameter GB/T 12668.2 Adjustable speed electrical power drive systems - Part 2: General requirements - Rating specifications for low voltage adjustable frequency a.c. power drive systems GB/T 12706.1 Power cables with extruded insulation and their accessories for rated voltages from 1 kV (Um = 1.2kV) up to 35kV (Um=40.5kV) - Part 1: Cables for rated voltage of 1kV (Um = 1.2 kV)and 3 kV (Um = 3.6kV) GB/T 12712 Technical management requirements for condensate recovery and automatic steam traps of steam heating system GB/T 12771 Welded stainless steel pipes for fluid transport GB/T 13350 Glass wool and its products for thermal insulation GB/T 13384 General specifications for packing of mechanical and electrical product GB/T 13401 Steel buttwelding pipe fittings - Technical specification GB/T 14382 Tee strainers for fluids for pipes GB/T 14549 Quality of electric energy supply - Harmonics in public supply network GB/T 17213.1 Industrial-process control valves - Part 1: Control valve terminology and general considerations GB/T 17213.2 Industrial-process control valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions GB/T 17213.10 Industrial-process control valves - Part 2-4: Flow capacity - Inherent flow characteristics and rangeability GB/T 17213.11 Industrial-process control valves - Part 3-2: Dimensions - Face to face dimensions for rotary control valves except butterfly valves GB/T 17213.12 Industrial-process control valves - Part 3-3: Dimensions - End-to-end dimensions for buttweld, two-way, globe-type, straight pattern control valves GB/T 17467 High-voltage/low-voltage prefabricated substation GB/T 17794 Preformed flexible elastomeric cellular thermal insulation GB/T 18033 Seamless copper tubes for water and gas GB/T 22239 Information security technology - Baseline for classified protection of cybersecurity GB/T 28575 Specification for YE3 series (IP55) three-phase induction motors (Frame size 63~355) GB/T 29044 Water quality for heating and air conditioning systems GB/T 32224-2020 Heat meters GB/T 34072 Specification of temperature transmitter for internet of things GB/T 34073 Specification of pressure transmitter for internet of things GB/T 37827 Welded ball valve for urban heating GB/T 37828 Bidirectional metal to metal sealed butterfly valve for urban heating GB/T 38536 Technical specification for the equipment of hot water heating substation GB 50015 Standard for design of building water supply and drainage GB 50054 Code for design of low voltage electrical installations GB 50057 Code for design protection of structures against lightning GB/T 50063 Code for design of electrical measuring device of power system GB 50126 Code for construction of industrial equipment and pipeline insulation engineering GB 50217 Standard for design of cables of electric power engineering GB 50236 Code for construction of field equipment, industrial pipe welding engineering GB 50264 Design code for insulation engineering of industrial equipment and pipe GB/T 50726 Technical standard for anti-corrosion engineering of industrial equipment and pipeline GB 51348 Standard for electrical design of civil buildings CJJ 28 Code for construction and acceptance of city heating pipelines CJJ/T 34 Design standard for urban heating network CJJ 88 Technical specification for operation and maintenance of urban heating system CJJ/T 247 Technical specification for noise and vibration control of heating station CJ/T 467 Semi-instantaneous water heate JB/T 7352 Solenoid valves for industrial-process measurement and control systems JB/T 8937 Wafer type check valve NB/T 47004.1 Plate heat exchangers - Part 1: Plate-and-frame heat exchangers NB/T 47013.2-2015 Non-destructive testing of pressure equipments - Part 2: Radiographic testing NB/T 47013.3-2023 Nondestructive testing of pressure equipment - Part 3: Ultrasonic testing NB/T 47045 Brazed plate heat exchangers QB/T 4008 Unsintered polytetrafuoroethylene (PTFE) tapes for thread sealing SH/T 3022 Design standard for anticorrosion coating of equipment and piping in petrochemical industry 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 heat exchange unit a whole heat exchange device composed of heat exchanger, water pump, frequency converter, filter, valve, electric control cabinet, instrument, control system, communication system and auxiliary equipment, etc., to realize the heat exchange and transportation between fluids, constant pressure, water supply, regulation control, communication and other functions 3.2 containerized heat exchange unit heat exchange unit installed in a container and lifting and transporting with the container as a whole Note: Also known as mobile heat exchange unit. 3.3 container structure that protects the heat exchange unit from external influences, with fire resistance, waterproof, noise reduction, anti-corrosion, impact resistance, damage resistance and other functions 3.4 distributed transmission system heating transmission and distribution system that uses circulating pumps (distributed pumps) dispersed at each heat user to provide partial or full circulating power instead of heat source circulating pumps and pipe network circulating pumps 3.5 primary circuit side heat or cold supply side 3.6 secondary circuit side heat or cold receive side 3.7 water⁃water heat exchange unit heat exchange unit in which the medium on both the primary and secondary circuit sides is water 3.8 steam⁃water heat exchange unit heat exchange unit in which the medium on the primary circuit side is steam, on the secondary circuit side is water 3.9 edge computing architecture that moves applications, data, and service computing from the network center to the edge server of the user terminal device for distributed computing 4 Classification and model 4.1 Classification The type classification of heat exchange units shall meet the requirements of Table 1. 4.2 Model designation 4.2.1 Model designation of heat exchange units shall meet the following requirements. 4.2.2 The use of primary circuit side media and secondary circuit side media shall meet the requirements of Table 2. 4.3 Model example Examples of heat exchange unit models are as follows: Example 1: Plate heat exchange unit, the primary circuit side medium is high temperature hot water, the secondary circuit side is used for radiator heating system, the heat load is 2.0MW, the nominal size of the primary circuit side is DN150, the nominal size of the secondary circuit side is DN200, the design pressure of the primary circuit side is 1.6MPa, and the design pressure of the secondary circuit side is 0.6MPa, is marked as: BJ⁃R/C⁃2.0⁃150/200⁃1.6/0.6 Example 2: Shell and tube heat exchange unit, the primary circuit side medium is steam, the secondary circuit side is used for radiator heating system and air conditioning system, the heat load is 3.0MW, the nominal size of the primary circuit side is DN125, the nominal size of the secondary circuit side is DN200, the design pressure of the primary side is 1.6MPa, and the design pressure of the secondary side is 1.0MPa, is marked as: GJ⁃Q/C•K⁃3.0⁃125/200⁃1.6/1.0

Contents of GB/T 28185-2025

Contents Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and model 5 General provisions 6 Technical requirements 7 Test methods 8 Inspection rules 9 Marking, instructions for use and product certificate 10 Packaging, transportation and storage Annex A (Normative) Schematic diagram of process control system of heat exchange unit Annex B (Normative) Installation, operation and maintenance