BS 8478:2006
$102.76
Respiratory protective devices. Breathing gases for diving and hyperbaric applications
| Published By | Publication Date | Number of Pages |
| BSI | 2006 | 20 |
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 3 | Contents 1 Scope 1 2 Normative references 1 3 Terms and definitions 1 4 Requirements 2 5 Test methods 7 6 Marking and/or labelling of cylinders and bundles of cylinders supplied filled by a manufacturer, and information to be supplied by the manufacturer 14 Bibliography 15 List of tables Table 1 – Composition of breathing oxygen 3 Table 2 – Composition of oxygen and nitrogen gas mixtures (nitrox) 4 Table 3 – Composition of oxygen and helium gas mixtures (heliox) 5 Table 4 – Composition of oxygen, helium and nitrogen gas mixtures (trimix) 6 Table 5 – Infra-red absorbance bands 10 Table 6 – Volumes of calibration mixture for calibration curve 13 |
| 4 | Foreword |
| 5 | 1 Scope a) breathing oxygen; b) oxygen and nitrogen gas mixtures (known as nitrox); c) oxygen and helium gas mixtures (known as heliox); d) oxygen, helium and nitrogen gas mixtures (known as trimix). 2 Normative references 3 Terms and definitions 3.1 oxygen and nitrogen gas mixture (known as nitrox) |
| 6 | 3.2 oxygen and helium gas mixture (known as heliox) 3.3 oxygen, helium and nitrogen gas mixture (known as trimix) 3.4 bundle of cylinders 4 Requirements 4.1 Freedom from toxic components 4.2 Freedom from particulate contamination a) If measurement is made by light/laser obscuration in accordance with 5.12.1, particles of diameter u10 4m shall not exceed 70 000 particles/m3, and there shall be no particles of diameter >10 4m. b) If measurement is made by filtration, in accordance with 5.12.2, the following limits shall not be exceeded: 4.3 Freedom from odour |
| 7 | 4.4 Composition of breathing oxygen Table 1 Composition of breathing oxygen |
| 8 | 4.5 Composition of oxygen and nitrogen gas mixtures (nitrox) Table 2 Composition of oxygen and nitrogen gas mixtures (nitrox) |
| 9 | 4.6 Composition of oxygen and helium gas mixtures (heliox) Table 3 Composition of oxygen and helium gas mixtures (heliox) |
| 10 | 4.7 Composition of oxygen, helium and nitrogen gas mixtures (trimix) Table 4 Composition of oxygen, helium and nitrogen gas mixtures (trimix) |
| 11 | 5 Test methods 5.1 General 5.2 Sampling 5.3 Assessment of odour 5.3.1 Assessors 5.3.2 Apparatus |
| 12 | 5.3.3 Procedure 5.4 Determination of water content 5.4.1 Apparatus 5.4.2 Procedure |
| 13 | 5.4.3 Calculations 5.5 Method for determination of infra-red active COMMENTARY ON 5.5 The determination of oil content as described in 5.11 should be carried out as part of this determination. It is not necessary to run a separate test. 5.5.1 Principle 5.5.2 Apparatus 5.5.3 Materials 5.5.4 Procedure 5.5.5 Calculations |
| 14 | Table 5 Infra-red absorbance bands 5.6 Method for determination of other non-toxic gases 5.6.1 Apparatus 5.6.2 Materials 5.6.3 Procedure 5.6.4 Calculations |
| 15 | 5.7 Method for determination of oxygen concentration 5.7.1 Apparatus 5.7.2 Procedure 5.7.3 Calculations 5.8 Method for determination of hydrogen concentration 5.8.1 Apparatus 5.8.2 Procedure 5.8.3 Calculations 5.9 Method for determination of nitrogen concentration 5.9.1 Apparatus |
| 16 | 5.9.2 Procedure 5.9.3 Calculations 5.10 Method for determination of helium concentration 5.10.1 Apparatus 5.10.2 Procedure 5.10.3 Calculations 5.11 Method for determination of oil content COMMENTARY ON 5.11 The determination of oil content as described in 5.11 should be carried out as part of the determination of infra-red active contaminants as described in 5.5. It is not necessary to run a separate test. 5.11.1 Principle 5.11.2 Apparatus |
| 17 | 5.11.3 Materials 5.11.4 Procedure 5.11.4.1 Preparation of calibration curve Table 6 Volumes of calibration mixture for calibration curve 5.11.4.2 Measurement of oil content 5.11.5 Calculation 5.12 Methods for measurement of particulate levels 5.12.1 Light/laser obscuration method 5.12.1.1 Apparatus |
| 18 | 5.12.1.2 Procedure 5.12.2 Particle counting and measuring method 5.12.2.1 Apparatus 5.12.2.2 Procedure 6 Marking and/or labelling of cylinders and bundles of cylinders supplied filled by a manufacturer, and information to be supplied by the manufacturer 6.1 Marking and/or labelling a) the number and date of this British Standard, i.e. BS 8478:2006; b) the content of oxygen, nitrogen and helium, as applicable. 6.2 Information to be supplied by the manufacturer a) the number and date of this British Standard, i.e. BS 8478:20062); b) the content of oxygen, nitrogen and helium, as applicable. |
| 19 | Bibliography |
