GB 16556-2025Respiratory protection - Self-contained open-circuit compressed air breathing apparatus (English PDF)

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 16556-2007 "Self-Contained Open-Circuit Compressed Air Breathing Apparatus". Compared with GB/T 16556-2007, the following changes are made. Aside from structural adjustments and editorial changes, the main technical changes are as follows:

a) The classification and labeling have been changed (see Chapter 4, Chapter 4 of the.2007 edition);

b) The technical requirements for expiratory resistance have been changed (see 5.5.2,

5.21.2 in the.2007 edition);

c) Requirements for the overall flame retardancy of emergency air respirators and flame engulfment test methods have been added (see 5.8.2.2, 6.9.4, and Appendix A);

d) Requirements and test methods for the water immersion resistance of respirators have been added (see

e) The requirements for mask leakage rate, airtightness, and impact resistance have been changed (see 5.11, 5.8.2, 5.8.4, and

5.8.6 of the.2007 edition);

f) Increased requirements for the protection of face shield lenses against high-speed particle impacts (see 5.11);

g) The technical requirements and test methods for pressure regulator safety valves have been revised (see 5.19.2, 6.16,

6.10 in the.2007 edition);

h) The explosion-proof technical requirements for electronic pressure gauges and electronic alarms have been revised (see 5.20.3, 5.21.3, and

5.18.3 in the.2007 edition);

1 Scope

China's mandatory national standard for self-contained open-circuit compressed air breathing apparatus. This is the set a firefighter wears into a burning building, and it is the last thing between the wearer and an atmosphere that will kill in minutes. Everything about the specification follows from that. The facepiece must seal and hold positive pressure, so that any leak flows outward and contaminated air cannot enter. The demand valve must deliver the flow of a person working hard in heat, which is far above resting consumption. The cylinder and its valve must survive being dropped, dragged and heated. The warning device must tell the wearer the air is running out early enough to get out, not early enough to notice. And the whole assembly must keep working after exposure to flame and radiant heat. The standard specifies those requirements and the tests that prove them.

This document specifies the technical requirements, labeling, packaging, and manufacturer information for self-contained open-circuit compressed air breathing apparatus, and provides a classification system. The symbols and tags describe the corresponding test methods. This document applies to self-contained open-circuit compressed air breathing apparatus (hereinafter referred to as air breathing apparatus) for industrial and emergency use. This document does not apply to closed-circuit breathing apparatus, diving breathing apparatus, escape breathing apparatus, and negative pressure breathing apparatus.

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 1226 General Pressure Gauges

GB 2626-2019 Respiratory Protection - Self-priming Filtering Respirators for Particulate Matter

GB 2890-2022 Respiratory Protective Self-priming Filtering Gas Mask

GB/T 3836.1 Explosive Atmospheres - Part

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 By ensuring a tight seal between the mask and the wearer's face, the wearer's respiratory organs, eyes, and face are kept away from toxic or oxygen-deficient air. A respirator that completely isolates the user, who carries their own clean compressed air as a breathing source, and whose exhaled air is directly released into the ambient air.

3.2 and emergency services A self-contained open-circuit compressed air breathing apparatus used by personnel undertaking emergency tasks such as fire fighting, hazardous chemical disposal, and rescue.

3.3 In addition to the areas where emergency air respirators are applicable, they are also suitable for use in mining, petrochemical, industrial and commercial, metallurgical, transportation, municipal construction, public utilities, and other fields. A self-contained open-circuit compressed air breathing apparatus used by workers in various industries.

3.4 static pressure The pressure inside the mask cavity when the air supply valve positive pressure device is turned on and the air circuit of the air respirator is balanced.