GB/T 9237-2017 in English
SUPERSEDEDRefrigerating systems and heat pumps—Safety and environmental requirements
- Issued on:2017-12-29
- Implemented on:2018-07-01
- File Format:PDF
- Delivery:Via email within 10 business days
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《GB/T 9237-2017制冷系统及热泵 安全与环境要求》由TC238（全国冷冻空调设备标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Interpretation of the core content of the standard
GB/T 9237-2017, as an important safety standard for the refrigeration industry, replaces the 2001 version and mainly strengthens the following:
- Refrigerator classification: Adopts the new classification system of GB/T 7778-2017, and clarifies the management requirements for new flammable refrigerants such as A2L
- System classification: The use space is divided into three categories: a/b/c, corresponding to different safety levels
- Charge quantity limit: Added Appendix A to specify in detail the maximum allowable amount of refrigerant in different places
Comparison of key technologies
| Technical elements | 2001 version | 2017 version |
|---|---|---|
| Refrigerator classification | Simple toxicity/flammability classification | Adopt ISO 817 complete classification system |
| Safety protection distance | Not clearly quantified | New space volume calculation formula (7.1-7.6) |
| Pressure relief device | General requirements | Add Appendix I specific layout examples |
Key points for the implementation of refrigeration system classification
Direct release systemSpecial attention should be paid to:
- Duct system needs to be equipped with double leakage protection (9.2.3)
- The sprinkler system should be equipped with an emergency drainage device (8.7)
- The machine room must be equipped with a refrigerant detector (Chapter 16)
Typical case: When a supermarket refrigeration system was renovated, the original R22 system was replaced with an R32 system. The filling volume needed to be recalculated and a combustible gas alarm system needed to be added.
Background of standard evolution
Main responses of the 2017 version:
- Environmental protection requirements: safe application of new refrigerants after the elimination of CFCs
- Technological development: popularization of modular units and frequency conversion technology
- Lessons from accidents: Strengthen the welding process requirements for pressure vessels (9.3.5)
Implementation suggestions
- Refrigerant leakage simulation should be carried out during the design phase (Appendix C)
- A2L refrigerant systems need to be equipped with double safety valves (10.2.3)
- Periodically conduct stress corrosion testing (Appendix P)
- Establish a refrigerant recovery record system (19.3.6)
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