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GB 31975-2025 English PDF

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GB 31975-2025: Respiratory protection - Technical requirements for compressed air of breathing apparatus
Status: Valid

GB 31975: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 31975-2025	English	239	Add to Cart	3 days [Need to translate]	Respiratory protection - Technical requirements for compressed air of breathing apparatus	Valid	GB 31975-2025
GB/T 31975-2015	English	120	Add to Cart	0--9 seconds. Auto-delivery	Technical Requirements of Compressed Air for Respiratory Protection	Valid	GB/T 31975-2015

PDF similar to GB 31975-2025

Standard similar to GB 31975-2025

GB/T 31975 GB 32166.1 GB/T 32166.2 GB/T 31975 GB 13641 GB 16556

Basic data

Standard ID	GB 31975-2025 (GB31975-2025)
Description (Translated English)	Respiratory protection - Technical requirements for compressed air of breathing apparatus
Sector / Industry	National Standard
Classification of Chinese Standard	C73
Classification of International Standard	13.340.30
Word Count Estimation	12,133
Date of Issue	2025-08-29
Date of Implementation	2026-09-01
Older Standard (superseded by this standard)	GB/T 31975-2015
Issuing agency(ies)	State Administration for Market Regulation; Standardization Administration of China

GB 31975-2025: Respiratory protection - Technical requirements for compressed air of breathing apparatus

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB31975-2025
ICS 13.340.30 CCSC73 National Standards of the People's Republic of China Replaces GB/T 31975-2015 Technical requirements for compressed air for respiratory protection Implemented on 2026-09-01 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 1 4.Technical Requirements 1 5.Test Method 2 6.Sample collection and on-site testing 4 Appendix A (Normative) Methods for the Detection of Oil Mist and Particulate Matter in Compressed Air 5 References 7

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 31975-2015 "Technical Requirements for Compressed Air for Respiratory Protective Equipment". Compared with GB/T 31975-2015, except for... Aside from structural adjustments and editorial changes, the main technical changes are as follows. a) The technical requirements for oxygen content, hazardous substance content, and odor have been revised (see 4.1, 4.2, 4.4, Chapter 4 of the.2015 edition); b) Added technical requirements for dew point and moisture content (see 4.3); c) The testing methods for hazardous substance content (carbon monoxide, carbon dioxide, dew point, and moisture content) have been changed (see 5.2, 5.3, 5.5,.2015). Versions 5.2, 5.3, and 5.5); d) An odor testing method has been added (see 5.6). Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China. The release history of this document and the document it replaces is as follows. ---First published in.2015 as GB/T 31975-2015; ---This is the first revision. Technical requirements for compressed air for respiratory protection 1.Scope This document specifies the technical requirements for compressed air used in respiratory protection, and describes the test methods, sample collection, and field testing. This document applies to compressed air used in respiratory protective equipment. This document does not apply to compressed air used in medical equipment, diving breathing equipment, and aviation breathing equipment.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. This document. GB/T 3863-2008 Industrial Oxygen GB/T 5832.2 Gas analysis – Determination of trace moisture – Part 2.Dew point method GB/T 12903 Terminology for Personal Protective Equipment GB/T 18204.2-2025 Hygiene Inspection Methods for Public Places - Part 2.Chemical Indicators 3.Terms and Definitions The terms and definitions defined in GB/T 12903 and the following terms and definitions apply to this document. 3.1 dewpoint The temperature at which the water content in a gas reaches saturation and condenses into dew or frost (ice) under constant pressure. 3.2 dewpoint method A method to indicate the moisture content of compressed air by testing its dew point. 4.Technical Requirements 4.1 Oxygen content The oxygen (O2) content in compressed air should be 19.5%~23.5% [volume fraction, under standard conditions (20℃, 101.3kPa)], according to 5.1 test. 4.2 Content of Hazardous Substances The content of harmful substances in compressed air should meet the technical requirements in Table 1 and be tested according to the corresponding test methods. Table 1 Technical Requirements for Hazardous Substance Content in Compressed Air Technical Specifications and Requirements a. Test Methods Carbon monoxide (CO) ≤10mL/m3 5.2 Carbon dioxide (CO2) ≤1000mL/m3 5.3 Oil mist and particulate matter ≤5.0mg/m3 5.4 All the required values are based on the values under standard conditions (20℃, 101.3kPa). 4.3 Dew point and moisture content According to test 5.5, the compressed air used in respiratory protective equipment should have a sufficiently low dew point to prevent condensation and freezing. The pressure of the compressed air... The dew point should be at least 5°C lower than the lowest ambient temperature at which the respiratory protective equipment will be used and stored. (This applies to the use and storage conditions of the respiratory protective equipment.) In cases where the exact temperature is unknown, the dew point of compressed air should not be higher than -11°C. The maximum moisture content requirement for compressed air supplied for breathing by respiratory protective equipment under different nominal maximum supply pressures should comply with Table 2.For For gas cylinders with a filling pressure of 20MPa~30MPa, the moisture content of the compressed air should not exceed 25mg/m3; for gas cylinders with a filling pressure of 30MPa... For the above-mentioned gas cylinders, the moisture content of the compressed air should be less than 25 mg/m3. Table 2 Moisture content of compressed air Nominal maximum gas supply pressure/MPa Maximum water content/(mg/m3) ≤0.5 290 >0.5~1.0 160 >1.0~1.5 110 >1.5~2.0 80 >2.0~2.5 65 >2.5~3.0 55 >3.0~4.0 50 >4.0~20.0 50 >20.0~30.0 35 Note. The maximum moisture content index is the value under standard conditions (20℃, 101.3kPa). 4.4 Odor According to test 5.6, the compressed air should have no obvious odor. 5.Test Methods 5.1 Oxygen content 5.1.1 The determination of oxygen content in compressed air shall be carried out according to the copper ammonia solution absorption method specified in GB/T 3863-2008. 5.1.2 The oxygen content in compressed air can also be tested using instrumental analysis methods such as paramagnetic, electrochemical, and thermal conductivity methods, with instrument accuracy up to [instrument accuracy missing]. The oxygen content (volume fraction) should be ±0.25%; during testing, the instrument should be operated and calibrated in advance according to the instrument manual, and the compressed gas should be adjusted.

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