GB 23394-2024 Respiratory protection - Positive pressure self-contained closed-circuit compressed oxygen breathing apparatus
1 Scope
This document specifies the classification and marking, technical requirements, inspection rules, as well as the requirements for the marking, packaging, transport, and storage of positive pressure self-contained closed-circuit compressed oxygen breathing apparatus, and describes the test methods.
This document applies to positive pressure self-contained closed-circuit compressed oxygen breathing apparatus (hereinafter referred to as “oxygen breathing apparatus”).
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 1226 General pressure gauge
GB/T 2410 Determination of the luminous transmittance and haze of transparent plastics
GB 2626-2019 Respiratory protection - Non-powered air-purifying particle respirator
GB 2890-2022 Respiratory protection - Non-powered air-purifying respirators
GB/T 3836.1 Explosive atmospheres - Part 1: Equipment - General
GB/T 3836.4 Explosive atmospheres - Part 4: Equipment protection by intrinsic safety “i”
GB/T 8982 Oxygen supplies for medicine and aircraft breathing
GB/T 11640 Seamless aluminum alloy gas cylinders
GB/T 16556-2007 Self-contained open-circuit compressed air breathing apparatus
GB/T 28053 Fully wrapped carbon fibre reinforced composite gas cylinders with aluminium alloy liners
GB/T 32166.2-2015 Personal protective equipment - Eye and face protection - Occupational eye and face protectors - Part 2: Test methods
MT/T 454 The calcium hydroxide specification for the isolation type oxygen respirator and the self-rescuer
TSG 23-2021 Regulation on safety technology for gas cylinder
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
positive pressure self-contained closed-circuit compressed oxygen breathing apparatus
respiratory protection equipment that isolates the wearer's breathing organs from harmful ambient air using a mask, and utilizing compressed oxygen as the breathing gas source, absorbing carbon dioxide from exhaled gas, replenishing oxygen, and supplying it back to the wearer to form a complete breathing cycle, ensuring that the pressure within the low pressure system remains no lower than the ambient pressure throughout any breathing cycle
3.2
high pressure system
high pressure gas circuit of breathing apparatus, consisting of components and connectors that contain high pressure oxygen, including gas cylinder, cylinder valve, pressure reducer, manual supply valve, pressure indicator, and alarm
3.3
medium pressure system
medium pressure gas circuit of breathing apparatus, composed of components and connectors that contain medium pressure oxygen, including constant-flow supply valve and automatic supply valve
3.4
low pressure system
low pressure gas circuit of breathing apparatus, composed of components and connectors that contain low pressure oxygen, including mask, exhalation valve, inhalation valve, breathing hose, purifier canister, cooling system, exhaust valve, and breathing bag or breathing chamber
4 Classification and marking
4.1 Classification
4.1.1 Classification by rated protection time
By rated protection time, positive pressure self-contained closed-circuit compressed oxygen breathing apparatus is classified into the following four types:
a) one-hour positive pressure oxygen breathing apparatus, code: 1h;
b) two-hour positive pressure oxygen breathing apparatus, code: 2h;
c) three-hour positive pressure oxygen breathing apparatus, code: 3h;
d) four-hour positive pressure oxygen breathing apparatus, code: 4h.
4.1.2 Classification by storage structure of low pressure section
By storage structure of low pressure section, positive pressure self-contained closed-circuit compressed oxygen breathing apparatus is classified into the following two types:
a) bag-type positive pressure oxygen breathing apparatus, code: N;
b) chamber-type positive pressure oxygen breathing apparatus, code: C.
4.1.3 Classification by gas cylinder
By the type of gas cylinder, positive pressure self-contained closed-circuit compressed oxygen breathing apparatus is classified into the following two types:
a) oxygen breathing apparatus with fully wrapped carbon fibre reinforced composite gas cylinders with aluminium alloy liners, code: F;
b) oxygen breathing apparatus with seamless aluminum alloy gas cylinders, code: L.
4.2 Marking
4.2.1 Product marking consists of product name, serial number of this document, rated protection time, storage structure of low pressure section, and gas cylinder type, or follows relevant industry standards.
Example: four-hour bag-type positive pressure oxygen breathing apparatus using fully wrapped carbon fibre reinforced composite gas cylinders with aluminium alloy liners is marked as:
positive pressure self-contained closed-circuit compressed oxygen breathing apparatus GB 23394-4h-N-F
4.2.2 The mask shall bear a permanent marking of production date and serial number, where "S" represents small size, "M" represents medium size, and "L" represents large size.
Contents
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Classification and marking
5 Technical requirements
6 Test methods
7 Inspection rules
8 Marking, packaging, transport and storage
Annex A (Normative) Test method for practical performance
Figure 1 Schematic diagram of the apparatus for the reverse leakage test of exhalation and inhalation valves
Figure 2 Schematic diagram of the apparatus for the ventilation resistance test of exhalation and inhalation valves
Figure 3 Schematic diagram of the respiratory protection performance test
Figure 4 Schematic diagram of the heat exchanger
Figure 5 Schematic diagram of the connector
Figure 6 Schematic diagram of the humidifier
Figure 7 Schematic diagram of the test headform
Figure 8 Schematic diagram for principle of the impact tester
Figure 9 Schematic diagram of the impact tester
Figure A.1 Block model
Table 1 Total weight of the oxygen breathing apparatus
Table 2 Values of indicated by the pressure indicator
Table 3 Exhalation and inhalation resistance of the oxygen breathing apparatus
Table 4 Parameters for protective performance test (I)
Table 5 Parameters for protective performance test (II)
Table 6 Inspection items
Table A.1 Time and frequency for the simulation operation test of the oxygen breathing apparatus
