The People’s Republic of China ≠ EDICT OF GOVERNMENT ± In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. GB 23394 (2009) (English): Self-contained close-circuit breathing apparatus of compressed oxygen ICS 13.340.30 National Standard of the People's Republic of China GB xxxx-200x Self-contained close-circuit breathing apparatus of compressed oxygen (Draft for approval) Issue Date: xx-xx-200x Implementation Date: xx-xx-200x Issued by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China - 1 - Table of Contents Foreword.......................................................................................................3 1 Scope..................................................................................................4 2 Normative references.......................................................................4 3 Terms and definitions......................................................................4 4 Classification and marks.................................................................5 5 Technical requirements...................................................................6 6 Test methods.....................................................................................15 7 Labelling, packaging, transportation and storage.........................26 - 2 - Foreword This Standard is a modified version of EN 145:1997 (Respiratory protective devices; Self-contained closed-circuit breathing apparatus; Compressed oxygen or compressed oxygen-nitrogen type; Requirements, testing, marking) of the European Committee for Standardization, the main technical differences are as follows: − the mass for 2-hour oxygen breathing apparatus has been re-specified; − the technical requirements for negative pressure oxygen breathing apparatus have been removed; − chambers for mixing respiratory gases into breathing bags and breathing chambers have been subdivided, and volumes for breathing bags and breathing chambers have been specified respectively; − the oxygen supply ration has been re-specified; − the test method for surface resistance in Appendix A has been removed. Article 5.10, Article 5.11, Article 5.19, Article 5.23, Article 5.24 and Article 5.25 of this Standard are mandatory. This Standard is proposed by the State Administration of Work Safety of the People’s Republic of China. This Standard is interpreted by and under the jurisdiction of the National Safe Production Standardisation Technical Commission. The following organisations participated in drafting this Standard: Shanxi Hong'an Science and Technology Co. Ltd; The Research Institute of Chemical Defence; Fushun Branch of China Coal Research Institute; The main drafters of this Standard are: Li Xiaoyin, Yu Jin, Li Xinnian, Jin Shouxiang, Li Xinwen and Yang Dongxing. - 3 - Self-contained close-circuit breathing apparatus of compressed oxygen 1 Scope This Standard specifies the technical requirements, test methods, classifications, inspection rules, markings, packaging, storage and transportation requirements for self-contained closed-circuit compressed oxygen and compressed oxygen-nitrogen breathing apparatus. This Standard applies to self-contained closed-circuit compressed oxygen and compressed oxygen- nitrogen breathing apparatus with positive pressure gas supplying modes (hereinafter referred to as oxygen breathing apparatus). This Standard does not apply to negative pressure oxygen breathing apparatus, compressed air breathing apparatus, underwater breathing apparatus and escape oxygen breathing apparatus. 2 Normative References The provisions of the following documents become provisions of this Standard after being referenced. For dated reference documents, all later amendments (excluding corrigenda) and versions do not apply to this Standard; however, the parties to the agreement are encouraged to check whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this Standard. GB/T 1226, General pressure gauges GB/T 2410, Transparent plastics, transmissitivity and haze test (EQV ASTM D1003:1977) GB/T 2891-1995, Performance test methods for facepiece of filter type respirator GB 3836.1-2000, Electrical apparatus for explosive gas atmospheres – Part 1: General requirements (EQV IEC 60079-0:1998) GB 3836.4–2000, Electrical apparatus for explosive gas atmospheres – Part 4: Intrinsic safety (EQV IEC 60079-11:1999) GB 5009, Seamless steel gas cylinders (NEQ ISO 4075:1983) GB 8982, Gaseous oxygen supplies for medicine DOT CFFC Standard, Carbon-fibre aluminium cylinders 3 Terms and definitions 3.1 Self-contained close-circuit compressed oxygen or compressed oxygen-nitrogen breathing apparatus A type of breathing apparatus which has a facepiece for isolating the respiratory organ of the apparatus wearer from the harmful air of the external environment; the apparatus carries compressed oxygen or compressed oxygen-nitrogen as the breathing air source, and absorbs the carbon dioxide exhaled by the wearer thereof, which mixes with the oxygen then is supplied back to - 4 - the wearer to breathe, forming a complete respiratory circulation. 3.2 Positive pressure self-contained close-circuit compressed oxygen or oxygen-nitrogen breathing apparatus A type of oxygen breathing apparatus. During any of the respiratory circulation processes, the pressure in the low pressure system is not lower than the environmental pressure. 3.3 High pressure system High pressure system refers to the high pressure gas path which is created by high pressure oxygen bearing components such as high pressure oxygen cylinders, cylinder switches, pressure reducers, manual replenishing valves, pressure indicators and alarm devices and their connectors, etc. 3.4 Medium pressure system Medium pressure system refers to the medium pressure gas path which is created by medium pressure oxygen bearing components such as quantitative oxygen supply valves and automatic replenishing valves and their connectors, etc. 3.5 Low pressure system Low pressure system refers to the low pressure gas path which is created by low pressure oxygen bearing components such as the facepiece, respiratory valve, respiratory hose, carbon dioxide absorption equipment, temperature cooler, exhaust valve and the breathing bag or breathing chamber etc. and their connectors. 4 Classifications and marks 4.1 Classifications 4.1.1 Classification on the basis of rated time-of-use: a) 1-hour positive pressure oxygen breathing apparatus, standard designation: 1; b) 2-hour positive pressure oxygen breathing apparatus, standard designation: 2; c) 3-hour positive pressure oxygen breathing apparatus, standard designation: 3; d) 4-hour positive pressure oxygen breathing apparatus, standard designation: 4. 4.1.2 Classification on the basis of the type of gas in the gas cylinder Oxygen breathing apparatus, standard designation: O a) 2; b) Oxygen-nitrogen mixture breathing apparatus, standard designation: O N . 2 2 4.2 Marks The product mark consists of the product name, number of this Standard, oxygen breathing apparatus classification, rated time-of-use and the classification of the gas cylinder. See 4.1 for the standard designation of the classification and the standard designation of the rated time-of-use for the oxygen breathing apparatus. The letters F, G and L represent carbon-fibre composite gas cylinders, steel gas cylinders and aluminium gas cylinders respectively. - 5 - Example 1: for a 4-hour positive pressure oxygen breathing apparatus, when using a carbon-fibre composite gas cylinder, the mark should be: Positive pressure oxygen breathing apparatus GB xxxx (number of this Standard)-O -4-F 2 The meanings of each element of the mark are listed below: O Oxygen breathing apparatus; 2 – 4 – Indicates the rated time-of-use is four hours; F – Indicates the cylinder is a composite gas cylinder. Example 2: for a 2-hour positive pressure oxygen-nitrogen mixture breathing apparatus, when using a steel gas cylinder, the mark should be: Oxygen-nitrogen mixture breathing apparatus GB xxxx (number of this Standard) -O N -2- 2 2 G The meanings of each element in the label are as follows: O N Oxygen-nitrogen mixture breathing apparatus; 2 2 – 2 – Indicates that the rated time-of-use is two hours; G – Indicates that the container is a steel gas cylinder. 5 Technical requirements 5.1 General provisions 5.1.1 With every test, all oxygen breathing apparatus which are being tested should meet the requirements specified in this Standard. 5.1.2 If no other rules are specified, when any of the clauses of this Standard are referenced, all of its sub-clauses should be referenced at the same time. 5.2 Ergonomic requirements The technical requirements of this Standard have taken into consideration the interactions between the wearer of any oxygen breathing apparatus, the oxygen breathing apparatus itself and the possible application places of the breathing apparatus. - 6 - 5.3 Design requirements 5.3.1 An oxygen breathing apparatus comprises a facepiece, a gas cylinder, a purifying pot, a cooling tank, a breathing bag or a breathing chamber, shell, a body harness, a respiratory hose, a pressure reducer, a pressure indicator and a pressure alarm device, etc. 5.3.2 The structure of any oxygen breathing apparatus should be simple, compact, and convenient for performing inspections according to the manufacturer’s instructions. 5.3.3 Oxygen breathing apparatus should be strong and reliable, should be able to withstand heavy usage and must be adaptive to the classification of the oxygen breathing apparatus. 5.3.4 Protruding components or parts on oxygen breathing apparatus are not permitted. If the wearer of the oxygen breathing apparatus passes though a narrow gap, any protruding parts of the oxygen breathing apparatus should not restrict the person from passing through. 5.3.5 Extruded parts or sharp corners on the shell of any oxygen breathing apparatus are not permitted. There should not be any sharp edges or burrs on the surfaces of the components which may come into contact with the wearer. The shells should be sufficiently strong, the backplates of the lower shells should meet the physiological curve of human back; and the clasp used to fix the upper and lower shells should have an appropriate degree of tightness and flexible unlocking so as to prevent accidental unlocking. 5.3.6 The components of oxygen breathing apparatus which are to be operated by the wearers should be easy and comfortable to reach, and should be identifiable by using your hands. None of the adjustable components or control valves should accidentally fluctuate during use. The installation position of the gas cylinder valve should be easy for the wearer to turn on/switch off the gas cylinder whilst it is in use. 5.3.7 The oxygen breathing apparatus should maintain their protective functions in any position. When an oxygen breathing apparatus is removed and the wearer is still wearing the facepiece, they should still be able to breathe from the oxygen breathing apparatus. 5.3.8 The chemicals used in the oxygen breathing apparatus and the generated saliva and condensate water should not affect the normal functions of the oxygen breathing apparatus or harm the user. 5.3.9 The operations of the oxygen breathing apparatus should be normal in the following circumstances: a) atmospheric pressure: 70 kPa ~ 125 kPa; b) relative humidity: 0% ~ 100%; c) environmental temperature: -20oC ~ +60oC. 5.3.10 The components of oxygen breathing apparatus for training and the components of oxygen breathing apparatus for operational use cannot be exchanged. Clear identification marks should be provided; the components of oxygen breathing apparatus for training cannot be assembled onto any oxygen breathing apparatus for operational use. - 7 - 5.4 Material requirements 5.4.1 The materials selected for oxygen breathing apparatus should have sufficient mechanical strength and should be anti-fatigue, anti-ageing and anti-corrosion. 5.4.2 With the exception of the facepieces and respiratory hoses, the surface resistance for any other exposed components of oxygen breathing apparatus must not exceed 1x109 Ω. 5.4.3 Aluminium, magnesium, titanium and their alloys must not be used as materials in the exposed components of oxygen breathing apparatus. 5.4.4 The materials used for the oxygen breathing apparatus which may come into direct contact with the breathing gases and the skin of the users should not be harmful to the health of the users. 5.4.5 The oxygen contained in the gas cylinders should meet the provisions set out in GB 8982, and the oxygen-nitrogen mixture contained in gas cylinders should meet the requirements of all relevant national health regulations. 5.4.6 The carbon dioxide absorbent should meet the following requirements: a) the absorption rate of carbon dioxide should not be less than 30%; b) the water content should be between 16% ~ 20%; c) the dust rate should not exceed 3%. d) the carbon dioxide content should not exceed 2.5%. 5.5 Cleaning and disinfection The materials used for oxygen breathing apparatus should be able to withstand anti-fogging agents, cleansers and disinfectants which are recommended by the manufacturer, and there should be no visible damage after being anti-fogged, cleaned and disinfected. 5.6 Mass The mass for the entire standby oxygen breathing apparatus unit equipped with facepiece and containing gas should meet the specifications prescribed in Table 1. Table 1: Oxygen breathing apparatus mass Classification of the oxygen Mass, kg breathing apparatus 1 ≤ 10 2 ≤ 12 3 ≤ 14 4 ≤ 16 5.7 Connection 5.7.1 General requirements 5.7.1.1 All components of oxygen breathing apparatus should be easy to disassemble, clean, check - 8 -