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SB/T 10345.2-2012 English PDF (SBT10345.2-2012)

SB/T 10345.2-2012 English PDF (SBT10345.2-2012)

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SB/T 10345.2-2012: Refrigerating systems and heat pumps. Safety and environmental requirements. Part 2: Design, construction, testing, marking and documentation

This part applies to the design and manufacture of refrigeration systems including piping, components, materials and auxiliary equipment directly connected to the system; specifies the requirements for testing, operation, marking and documentation of the refrigeration system. For heat transfer fluids that are not gaseous under atmospheric pressure, the requirements for the heat transfer fluid circuit do not belong to the scope of this part, but this part still applies to any safety devices related to the refrigeration system. This part does not apply to refrigeration systems using air or water as refrigerants, nor does it include requirements for refrigeration equipment used in potentially explosive atmospheres.
SB/T 10345.2-2012
SB
DOMESTIC TRADE INDUSTRY STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 27.080; 27.200
J 73
Filing No.: 37192-2012
Replacing SB/T 10345.2-2001
Refrigerating systems and heat pumps -
Safety and environmental requirements - Part 2:
Design, construction, testing, marking and
documentation
ISSUED ON: AUGUST 01, 2012
IMPLEMENTED ON: NOVEMBER 01, 2012
Issued by: Ministry of Commerce of PRC
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 6
3 Terms, definitions, naming, classification and abbreviations of refrigerants .. 6 4 Major hazards ... 6
5 Safety requirements and measures ... 7
6 Requirements for assembly ... 13
Appendix A (Normative) Additional requirements for R717 refrigeration systems and heat pumps ... 50
Appendix B (Normative) Determination of assembly type ... 52
Appendix C (Normative) Requirements for intrinsic safety test ... 57
Appendix D (Informative) Installation examples of pressure relief devices in refrigeration systems ... 60
Appendix E (Informative) Checklist for device appearance inspection ... 64 References ... 66
Refrigerating systems and heat pumps -
Safety and environmental requirements - Part 2:
Design, construction, testing, marking and
documentation
1 Scope
This part applies to the design and manufacture of refrigeration systems including piping, components, materials and auxiliary equipment directly connected to the system; specifies the requirements for testing, operation, marking and documentation of the refrigeration system. For heat transfer fluids that are not gaseous under atmospheric pressure, the requirements for the heat transfer fluid circuit do not belong to the scope of this part, but this part still applies to any safety devices related to the refrigeration system. This part does not apply to refrigeration systems using air or water as refrigerants, nor does it include requirements for refrigeration equipment used in potentially explosive atmospheres.
The auxiliary equipment of the refrigeration system includes:
- Fan and fan motor;
- Motor and transmission mechanism of open compressor.
This part specifies the requirements related to fixed and mobile refrigeration systems (including heat pumps) of various sizes.
This part is not applicable to systems using refrigerants not listed in Appendix D of Part One of this standard, as long as the safety groups of these refrigerants have not been determined.
The basic safety requirements for refrigeration systems in Part 1 of this standard are also applicable in this part.
Part 3 of this standard also applies to the basic requirements of the installation site.
This part does not apply to refrigeration systems and heat pumps manufactured before the date of publication of this standard.
supply failures, control loop failures, takeover errors, etc.
5 Safety requirements and measures
5.1 General safety and environmental requirements
5.1.1 Overview
Safety and environmental requirements are given in 5.2 and clause 6 of this part.
5.1.2 Hazard to people, property and environment
The design and construction of the refrigeration system and its components shall strive to eliminate possible hazards to people, property and the
environment. The method of intentionally discharging refrigerant shall not cause harm to persons, property and the environment and shall comply with relevant laws and regulations.
5.2 Safety requirements for components and piping
5.2.1 General requirements
Components and piping shall comply with relevant standards.
5.2.2 Special requirements
5.2.2.1 Overview
In addition to the requirements of clause 5.2.1, the special components and piping of the refrigeration system shall meet the following requirements. 5.2.2.2 Tightness
If the test method is not given in the standard of the component, the test method applicable to the component and refrigerant shall be adopted to ensure its tightness, see clause 6.3.4 for details.
If necessary, some or all tests of the components may be carried out, see 6.3. The tightness test shall be carried out after the components have passed the pressure resistance test or type test verification.
5.2.2.3 Piping joints
Piping joints must not be damaged by external freezing. They shall be suitable for pipes, piping materials, pressure, temperature and fluid.
b) Steel, cast steel, carbon steel and low alloy steel
Steel, cast steel, carbon steel and low-alloy steel can be used for
components containing refrigerants, as well as heat transfer medium
circuits. Where low temperature and high pressure occur at the same time, or where there is a risk of corrosion and/or thermal stress, steel with appropriate impact strength shall be used, but attention shall be paid to its thickness, minimum working temperature, fusion welding characteristics. c) High alloy steel
Where low temperature and high pressure occur simultaneously, or where
there is a risk of corrosion and/or thermal stress, high-alloy steel may be required. If necessary, the impact strength shall be adapted to the special load, meanwhile the material shall be suitable for fusion welding.
d) Stainless steel
When using stainless steel, care shall be taken to ensure that the grade of stainless steel is compatible with the fluid used and the impurities (such as NaCl, H2SO4) that may exist in the environment.
5.3.1.3 Non-ferrous materials and their alloys (cast, forged, rolled, drawn) The material of the components shall be suitable for the specified temperature and pressure range; they can only be used with compatible refrigerants. a) Copper and copper alloys
The copper in contact with the refrigerant shall be oxygen-free copper or non-oxidized copper.
Copper and alloys with a high copper content shall not be used for parts containing R717, unless their compatibility has been confirmed by tests or experience.
b) Aluminum and aluminum alloy
The aluminum used in the gasket in the R717 system must not be less
than 99.5% pure. Aluminum alloys with a magnesium content of more than
2% shall not be used in halogenated refrigerants, unless their compatibility has been confirmed by tests or experience.
Aluminum and aluminum alloys must not be used in contact with R40
(CH3Cl).
Note: As long as the strength of aluminum and aluminum alloy is appropriate and compatible with the refrigerant and lubricating oil used, they can be used in any - Pressure for test cycle: High pressure value shall not be less than 0.7 x PS; low pressure value shall not be greater than 0.2 x PS. For the water heat exchanger in the heat pump, the high pressure value shall be 0.9 x PS.
- The test pressure of the last cycle shall be increased to 1.4 x PS (2 times 0.7 x PS); for the water heat exchanger in the heat pump, it shall be 1.8 x PS (2 times 0.9 x PS).
During the test, the components shall not crack, burst or leak.
Take 3 test pieces (not used for fatigue test) for pressure resistance test with test pressure of 2 x PS. During the test, the components shall not crack, burst or leak.
5.3.3 Marking
Various parts do not require special marking.
5.3.4 Document preparation
The following files of the component shall be provided:
a) Test results;
b) According to the requirements of 5.3.1, test certificates of materials shall be provided, to ensure that the materials used are consistent with the
required specifications;
c) Any required certificates shall be signed by qualified personnel in charge of inspection, testing and verification and be prepared by appointed
representatives;
d) The prepared document shall include the following contents:
- Maximum allowable pressure;
- Maximum allowable temperature;
- The refrigerant used;
- The oil used.
6 Requirements for assembly
6.1 Overview
The design, construction, testing, installation, documentation and marking of refrigeration system assemblies shall meet the requirements of this clause. The refrigeration system assembly using R 717 refrigerant shall also meet other requirements specified in Appendix A.
The category of the assembly shall be determined in accordance with Appendix B.
The refrigeration system shall be charged with refrigerant in the manufacturing plant or at the installation site according to the method introduced by the manufacturer (see 6.4.3.2).
Materials for construction, fusion welding and brazing shall be suitable to withstand predictable mechanical stress, thermal stress and chemical stress. They shall be compatible with refrigerants, refrigerant/oil mixtures that may contain impurities and contaminants, heat transfer media.
6.2 Design and construction
6.2.1 Overview
All components of the refrigerant circuit assembly shall meet the requirements of clause 5.
6.2.2 Determination of the maximum allowable pressure
6.2.2.1 Maximum allowable pressure (PS)
The determination of the maximum allowable pressure shall consider the
following factors:
a) The highest ambient temperature;
b) The possibility of presence of non-condensable gas;
c) The setting of any pressure relief device;
d) Defrosting method;
e) Purpose (such as cooling or heating);
f) Solar radiation (such as the impact on the ice rink during the outage period); g) Dirt.
The designer shall determine the maximum allowable pressure in the various components of the refrigeration system based on the ambient temperature at the installation site.
6.2.3.3 Requirements for on-site installation of pipelines
6.2.3.3.1 Overview
The piping layout shall consider the position of each pipe, the flow state of the fluid in the pipe (two-phase flow, partial load oil supply operation), condensation process, thermal expansion, vibration and inspection channels.
Note: The direction and support of the pipeline have an important influence on the operational reliability and applicability of the refrigeration system.
It is generally required that the installation of the pipeline shall avoid any normal activities to damage the pipeline.
For the sake of safety and environmental protection, the installation of pipelines shall pay attention to the following items:
a) There shall be no danger to personnel, the evacuation channel shall be unobstructed, the access channel shall not be blocked. Valves and
detachable joints shall not be located in areas leading to public places using refrigerants of groups A2, B1, B2, A3, B3. The pipelines of other refrigerants shall be protected to prevent unintentional operation and
disconnection.
b) The pipeline shall be separated from the high temperature pipeline and heat source by means of heat insulation.
c) Only after the pipes are connected by brazing, fusion welding or
mechanical methods, can the valve be opened to allow the refrigerant to flow between the components of the refrigeration system (such as a split system). A valve shall be provided to isolate the interconnecting pipe
and/or any refrigeration system components that are not filled with
refrigerant.
d) The refrigerant pipeline shall be protected or sealed to avoid damage. e) Flexible refrigerant connectors such as the connecting pipeline between the indoor unit and the outdoor unit shall be protected to avoid mechanical damage.
6.2.3.3.2 Special requirements for installation of equipment piping using groups A2, A3, B2, or B3 refrigerant
The refrigeration system's piping parts that need to be brazed or welded on site shall not be equipped with A2, A3, B2 or B3 groups of refrigerants during transportation.
During the installation of the refrigeration system, the connection between Note: It should evaluate the vibration or impulse of the system under the highest condensing temperature and the system startup and shutdown conditions (the pipeline is most affected by the worst).
b) Protective devices, pipelines and accessories shall be protected as much as possible to avoid adverse effects on the environment. The adverse
effects on the environment shall be considered, such as the accumulation of water and freezing in the discharge pipe, or the accumulation of dirt and debris.
c) Preventive measures shall be taken for the expansion and contraction of long pipelines.
d) The design and installation of piping in the refrigeration system shall ensure that the system is not damaged when liquid hammer (hydraulic
shock) occurs.
e) Steel pipes and components shall be coated with anti-corrosion layer before laying the thermal-insulation layer; the adhesive used for laying the thermal-insulation layer must not react with the anti-rust coating used or dissolve the anti-rust coating.
f) The flexible pipe components shall be protected from mechanical damage, excessive stress caused by torque or other forces.
6.2.3.3.5 Air duct or pipeline in shaft
When refrigerant pipes and pipes for other purposes are co-located in the same air duct, precautions shall be taken to avoid damage caused by their interaction. No refrigerant pipes shall be installed in the ventilation pipes or air-conditioning ducts which are also used as evacuation ducts.
The pipeline shall not be located in the lifting shaft.
6.2.3.3.6 Pipe location
Sufficient space shall be provided where the pipe needs to be insulated. Prevent possible accidental damage to the pipes located in the equipment room or enclosure structure.
Pipes with detachable joints and without disconnection protection shall not be located in public corridors, vestibules, stairwells, stair platforms, entrances and exits, nor shall they be located in any ducts or shafts connecting unprotected openings to the above positions.
Pipes that have no detachable joints, valves or control devices and can prevent Where there is a danger of refrigerant discharge (such as an oil discharge point), a self-closing valve shall be installed on the discharge pipeline. A self-closing valve shall be installed on the pipeline for the discharge of oil accumulated in the refrigeration system (such as discharged from the oil separator, the liquid reservoir). A shut-off valve with a vertical spindle shall be installed in front of the self-closing valve, or a valve that combines the functions of the two shall be installed.
b) Transfer of oil and refrigerant
In order to use the compressor or external evacuation device in the
system (excluding the closed system) to transfer the refrigerant and oil in the system to the liquid collector inside or outside the system, the
refrigeration system shall have the necessary cut-off devices or connect the supporting equipment.
The discharge valve shall be installed so that the refrigerant can be easily removed from the system, meanwhile no refrigerant is lost to the
atmosphere.
c) Flange blocking plate
Pipes not used during normal operation shall be equipped with permanent or removable flange plugs or similar plugs.
6.2.4 Cut-off device
6.2.4.1 Isolation valve
The refrigeration system shall be equipped with a sufficient number of isolation valves, to minimize danger and refrigerant loss during overhaul and
maintenance.
6.2.4.2 Manual valve
Manual valves required under basic operating conditions shall be equipped with a manual wheel or operating handle.
6.2.4.3 Replacement of sealed tube packaging/sealing packing
If it is impossible to tighten or replace the sealing tube packaging/seal packing and the valve is under system pressure, it shall be possible to isolate the valve from the system; or provide other methods to extract the refrigerant from the part of the refrigeration system where the valve is located.
6.2.4.4 Installation of cut-off device
6.2.6.4 Isolation of pressure relief devices
Except as described in 6.2.6.6, no isolation valve shall be installed on the inlet and outlet pipelines of the pressure relief device.
6.2.6.5 Indication device of pressure relief device
For systems with refrigerant filling quantity equal to or greater than 300 kg, an indicator device shall be provided to determine whether the safety valve has been discharged to the atmosphere during maintenance. Examples of
indicating devices are as follows:
- Oil-filled U-shaped elbow;
- The maximum value indicating pressure gauge placed between the safety valve and the bursting disc;
- The monitoring and pressure alarm (pressure limiter) in the installation space upstream of the bursting disc. The actual relief pressure of the
certified pressure limiter in the monitoring space shall be set to less than or equal to 0.05 MPa;
- The gas sensor in the discharge pipe, or
- A safety valve with a soft seal; when the pressure reaches 0.2 MPa lower than the actual release pressure of the safety valve, the pressure of the protected part is monitored and an alarm is issued at the personnel on duty. 6.2.6.6 Installation of pressure relief devices in the refrigeration system The pressure relief device shall be installed on or close to the pressure vessel or other parts of the refrigeration system to be protected. Except for devices that prevent the expansion of refrigerant liquid, pressure relief devices shall be easy to approach and shall be connected above the liquid level.
It is permitted to use a lock valve protected by a sleeve, cap or shackle between the compressor and its pressure relief device.
When an externally installed single pressure relief device is used to discharge the refrigerant to the low pressure side of the refrigeration system, measures shall be taken to ensure that a large amount of refrigerant is not lost when the device is removed. For systems with a refrigerant charge greater than 100 kg, a lock valve shall be installed before and after the overflow valve. The lock valve shall be protected by a sleeve, cap or shackle and sealed with a lead seal, to prevent unauthorized adjustment. The lead seal shall be clearly marked with the identification of the competent person. The overflow pipe of the overflow valve is connected preferentially to the gas phase and shall be connected to the low pressure side of the system through the shortest path (such as the gas the safety valve and obstruct the flow of refrigerant.
d) Discharge pipeline of the pressure relief device
- Overview
The discharge of self-relief devices shall not cause the discharged
refrigerant to cause harm to persons and property.
Note 2: The refrigerant can be diffused into the air through appropriate methods, but it must be far away from any air intake of the building, or the refrigerant shall be discharged into a sufficient amount of suitable absorbent material.
- Prevent adverse effects on the environment
The adverse effects on the environment shall be considered, such as the danger of accumulation of water and freezing in the discharge pipe, or
the accumulation of dirt and debris.
- Calculation
The discharge pipeline of the pressure relief device shall be calculated according to relevant standards.
- Connection with discharge devices
The connection of the discharge pipe and the discharge device shall be
able to carry out a separate sealing test for each discharge device.
6.2.6.7 Installation of safety switch for pressure limiting
a) Overview
Except for the following two cases, no shut-off valve shall be installed between the pressure limiting safety switch a...

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