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GB/T 44556-2024: Refrigerating systems and heat pumps - Qualification of tightness of components and joints
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Refrigerating systems and heat pumps - Qualification of tightness of components and joints
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Basic data | Standard ID | GB/T 44556-2024 (GB/T44556-2024) | | Description (Translated English) | Refrigerating systems and heat pumps - Qualification of tightness of components and joints | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J73 | | Classification of International Standard | 27.200 | | Word Count Estimation | 34,313 | | Date of Issue | 2024-09-29 | | Date of Implementation | 2025-04-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 44556-2024: Refrigerating systems and heat pumps - Qualification of tightness of components and joints
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
National Standard of the People's Republic of China
ICS 27.200CCS J 73
Refrigeration systems and heat pumps
Tightness assessment of components and joints
Refrigeration systems and heat pumps-
Qualification of tightness of components and joints
(ISO 14903.2017, MOD)
2024-09-29 Release
2025-04-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface Ⅲ
1 Scope...1
2 Normative references ...1
3 Terms and Definitions 2
4 Symbols 3
5 Test requirements 3
6 Requirements for closed systems ...6
7 Test Procedure 6
7.1 General Principles 6
7.2 Sample selection 7
7.3 Test temperature 7
7.4 Sealing test 7
7.5 Requirements for joints 10
7.6 Pressure-temperature vibration test (PTV test) 10
7.7 Running a Simulation 17
7.8 Freezing test 18
7.9 Additional pressure test for closed joints 19
7.10 Vacuum test 19
7.11 Compatibility test 20
7.12 Fatigue test of closed joints 22
8 Test Report 22
9 User Information...22
Appendix A (Informative) Equivalent Sealing Control Level 23
Appendix B (Normative) Test Arrangement 27
References ...29
Foreword
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting is required.
This document is modified to adopt ISO 14903.2017 "Evaluation of the tightness of components and joints in refrigeration systems and heat pumps".
Compared with ISO 14903.2017, this document has the following structural adjustments.
--ISO 14903.2017 7.6.4.2.1~7.6.4.2.9, 7.6.5.3.1~7.6.5.3.7, 7.6.5.4.6.1~7.6.5.4.6.5 use items
Formal representation (see 7.6).
The technical differences between this document and ISO 14903.2017 and their reasons are as follows.
--Replaced ISO 5149-1 and ISO 5149-2 (see Chapter 3, 7.9) with the normative reference GB/T 9237 to adapt to my country's
Technical conditions;
-- The symbol N which is not used in the standard has been deleted (see Chapter 4);
-- The normative reference GB/T 44557 replaces ISO 13971, GB 4706.17 replaces IEC 60335-2-34 (see Section 5).
Chapter) to adapt to my country's technical conditions and improve operability;
-- Added the normative reference GB/T 40335-2021 and deleted EN 13185 (see 7.4.2) to adapt to my country's technical requirements
parts, improve operability;
--The description of the tmax parameter was changed to "the maximum temperature specified by the manufacturer, if not specified, 140 °C" (see Table 8 and Table 9) to provide
High test operability, eliminating ambiguity;
--Replace IEC 60068-2-6 with the normative reference GB/T 2423.10, and replace IEC 60068-2-6 with GB/T 2423.56
64 (see 7.6.5.4.5) to adapt to my country's technical conditions and improve operability;
-- The normative references GB/T 1690 replace ISO 1817, GB/T 11547 replace ISO 175 (see 7.11.3), and
Adapt to my country's technical conditions and improve operability.
The following editorial changes were made to this document.
--Correct the editorial error of ISO 14903.2017, change "Table 2 and Table 3" in Figure 2 to "Table 1 and Table 2", "Table 4 and
Table 5" was changed to "Table 3 and Table 4";
--Correct the editorial error of ISO 14903.2017, change "Table 12" to "Table 11" in 7.6.5.4.5 Component Test 1 (see
7.6.5.4.5);
--Deleted the note in Table A.1 of ISO 14903.2017.
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Standardization of Refrigeration and Air-conditioning Equipment (SAC/TC 238).
This document was drafted by. Hefei General Electromechanical Products Testing Institute Co., Ltd., China National Institute of Standardization, Danfoss (Tianjin) Co., Ltd.
Guangdong Midea Heating and Ventilation Equipment Co., Ltd., Zhejiang Sanhua Commercial Refrigeration Co., Ltd., Guangdong Phoenix Energy Saving Equipment Co., Ltd., Farley
Ao Auto Air Conditioning Hubei Co., Ltd., Wucheng County Market Supervision and Administration Bureau, and Hefei General Machinery Research Institute Co., Ltd.
The main drafters of this document are. Chen Xinqiang, Fang Min, Wang Yanfeng, Xiao Jing, Li Yanlong, Chen Yuzhong, Liu Yuanhui, Zhao Changcheng, Li Shengbo, Xie Bo,
Wang Zhimei, Zhao Zongbin, Hu Yiqing, Wang Rujin, and Wang Shouchuan.
Refrigeration systems and heat pumps
Tightness assessment of components and joints
1 Scope
This document provides the closed and sealed components, joints and
Type approval assessment procedure for the sealing performance of parts. The relevant closed and sealed components, joints and parts mainly refer to accessories, bursting discs,
Flange type or assembled components. The sealing performance of flexible pipes made of non-metallic materials is in accordance with GB/T 44557.This document covers the sealing performance of flexible pipes made of non-metallic materials.
Sex tube.
The requirements contained in this document apply to fittings with a nominal size not exceeding DN50 and an internal volume not exceeding 5 L and a mass not exceeding
50 kg of parts.
The purpose of this document is to describe the sealing stresses encountered during operation of components assembled according to the manufacturer's procedures and to give the
A list of the minimum necessary information that the supplier provides to the personnel responsible for executing the procedure.
This document specifies the overall tightness level of the components when assembled according to the manufacturer's requirements.
This document applies to closed and sealed components, joints and parts used in refrigeration equipment, including all parts with seals.
Regardless of its material and design.
This document specifies additional requirements for mechanical joints that may be considered as closed joints.
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document.
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document.
GB/T 1690 Test method for resistance of vulcanized rubber or thermoplastic rubber to liquids (GB/T 1690-2010, ISO 1817.2005,
MOD)
GB/T 2423.10 Environmental testing Part 2.Test methods Test Fc. Vibration (sinusoidal) (GB/T 2423.10-2019,
IEC 60068⁃2⁃6.2007, IDT)
GB/T 2423.56 Environmental testing Part 2.Test methods Test Fh. Broadband random vibration and guidance (GB/T 2423.56-
2023, IEC 60068⁃2⁃64.2019, IDT)
GB 4706.17 Safety of household and similar electrical appliances - Particular requirements for motor-compressors (GB 4706.17-2010,
IEC 60335⁃2⁃34.2009, IDT)
GB/T 9237 Safety and environmental requirements for refrigeration systems and heat pumps (GB/T 9237-2017, ISO 5149-1.2014, ISO 5149-
2.2014, ISO 5149⁃3.2014, ISO 5149⁃4.2014, MOD)
GB/T 11547 Determination of resistance of plastics to liquid chemical reagents (GB/T 11547-2008, ISO 175.1999, MOD)
GB/T 40335-2021 Non-destructive testing - Leak detection - Tracer gas method (ISO 20485.2017, MOD)
GB/T 44557 Requirements and classification of flexible piping components and non-metallic pipe fittings for refrigeration systems and heat pumps (GB/T 44557-
2024, ISO 13971.2012, MOD)
EN 1593 Non-destructive testing - Leak testing - Bubble emission technology
emission techniques)
EN 12693 Refrigerating systems and heat pumps Safety and environmental requirements Positive displacement refrigerant compressors
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