BS EN 402:1993 download free.Specification for Respiratory protective devices for escape: Self-contained open-circuit compressed air breathing apparatus with full face mask or mouthpiece assembly.
Introduction
A given respiratory protective device can only be approved when the individual components satisfy the requirements of the test specification which may be a complete standard or part of a standard and practical performance tests have been carried out on a complete apparatus where specified in the appropriate standard. If for any reason a complete apparatus is not tested then simulation of the apparatus is permitted provided the respiratory characteristics and weight distribution are similar to those of the complete apparatus.
1 Scope
BS EN 402 refers to self-contained open-circuit compressed air breathing apparatus with full face mask or mouthpiece assembly for escape (in short: compressed air escape apparatus). It specifies minimum requirements for compressed air escape apparatus.
BS EN 402 does not apply to apparatus for work and rescue or to diving devices.
Laboratory and practical performance tests are included for the assessment of compliance with the requirements.
2 Normative references
BS EN 402 incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies.
EN 132, Respiratory protective devices — Definitions.
EN 134, Respiratory protective devices — Nomenclature of components.
EN 136, Respiratory protective devices — Full face masks — Requirements, testing, marking.
EN 148-1, Respiratory protective devices— Threads for facepieces — Standard thread connection.
3 Definition and description
The nomenclature and definitions of self-contained open-circuit compressed air escape apparatus, the subassemblies and the components are given in EN 1:32 and EN 134 together with the following.
5.2 Materials
The carrying container and the locking device, where present, shall be adequately protected against corrosion. The materials used shall be able to withstand temperatures and mechanical stress expected whilst being carried on the man as well as on machines and vehicles.
Exposed parts, i.e. those which may he subjected to impact during use of the apparatus, shall not be made of aluminium, magnesium, titanium or alloys containing such proportions of these metals as will, on impact, give rise to frictional sparks capable of igniting flammable gas mixtures.
Any container making use of such material shall be adequately protected so that when tested according to national regulations for impact and scraping no metal shall be exposed.
To prevent electrostatic charges on non-metal carrying containers, the surface resistance shall not exceed 10> 2. Where the apparatus is required to be antistatic during escape, materials used shall be antistatic as far as it is practicable.
Materials which come into direct contact with the wearer’s skin and the breathable gas shall not be known to be likely to cause irritation or any other adverse effect to health.
Testing in accordance with 6.1, 6.2 and 6.4.8.
5.3 Cleaning and disinfection
All parts requiring cleaning and disinfecting shall be able to withstand cleaning and disinfecting agents and procedures as recommended by the manufacturer.
Testing in accordance with 6.1.
5.4 Mass
The mass of the complete apparatus including carrying container shall not exceed 5 kg when designed to be carried on the man for a complete shift.
Testing in accordance with 6.1.
5.5 Connections
Any means for sealing used shall be retained in position when the connection(s) is (are) disconnected during normal maintenance. Testing in accordance with 6.1.
5.6 Harness
The apparatus shall have a harness.
Any harness shall be designed to allow quick. easy and correct donning of the apparatus without assistance.
Testing in accordance with 6.1 and 6.2.
Testing in accordance with 6.1 and 6.2 and the relevant clauses in EN 136.
5.10 Goggles
If the device shall be used with goggles, then the lenses of the goggles shall be protected against fogging. The head straps of the goggles shall be flexible and easily adjustable or self-adjusting.
The goggles shall be attached to the apparatus to prevent loss. The goggles shall not interfere with the donning of the apparatus.
Testing in accordance with 6.1 and 6.2.
5.11 Inhalation and exhalation valves Valve assemblies shall be such that they can be readily maintained and correctly replaced. It shall not be possible to fit an exhalation valve assembly into the inspiratory circuit or an inhalation valve assembly into the exhalation circuit.
Testing in accordance with 6.1.
5.11.1 Inhalation valve(s)
Inhalation valve(s) shall function correctly in all orientations.
5.11.2 Exhalation valve(s)
5.11.2.1 Exhalation valve(s) shall function correctly in all orientations.
5.11.2.2 Exhalation valve(s) shall be protected against dirt and mechanical damage and shall be shrouded or shall include any other device that may be necessary to comply with 4.7 of EN 136.
5.11.2.3 The exhalation valve(s) shall continue to operate correctly after:
a) a continuous exhalation flow of 300 11mm; and b) a negative pressure (static) in the mask of 80 mbar;
(30 s for each test).
5.11.2.4 When the exhalation valve housing is
attached to the faceblank it shall withstand axially
a tensile force of 150 N applied for 10 s. The test is
repeated 10 times in 10 s intervals.
5.12 Resistance to temperature
5.12.1 Storage
After conditioning in accordance with 6.4.1 and return to (20 ± 3) °C, the connectors between apparatus and facepiece shall be examined. For standardized threads a thread gauge shall be used to check dimensions.
For all equipment connectors, a pull test as described in 4.12.3 and 5.7 of EN 136 shall be applied and no separations shall occur.
Non-metallic parts shall be tested to prove that they are capable of withstanding a pressure twice the maximum filling pressure of the air container. Testing in accordance with 6.1.
5.15 High and low pressure connections
It shall not be possible to fit a low pressure hose
directly to a high pressure part of the circuit.
Testing in accordance with 6.1.
5.16 Compressed air container(s)
Compressed air containers shall comply with national regulations. The container shall be approved with respect to the appropriate filling pressure.
NOTE Only containers of equal maximum filling pressure shall be connected to an apparatus with more than one container.
Testing in accordance with 6.1.
5.17 Compressed air container seal
There shall be only one seal or other technical provisions to open the total air stored. The seal or its equivalent shall be opened easily by hand or automatically when starting the apparatus.
Where a conventional valve is used it shall be so designed that the valve spindle cannot be completely unscrewed from the assembly during normal operation of the valve.
The opening device shall be designed so that it cannot be closed inadvertently by contact with a surface.
Testing in accordance with 6.1 and 6.2.
It shall not be possible to connect containers with a higher maximum filling pressure (e.g. 300 bar) to an apparatus which is designed only for a lower maximum filling pressure (e.g. 200 bar).
Testing in accordance with 6.1.
5.18 Pressure reducer
If the apparatus is designed with a pressure reducer, any adjustable medium pressure stage shall be reliably secured against accidental alteration and adequately sealed so that any unauthorized adjustment can be detected. Testing in accordance with 6.1.
5.19 Pressure safety valve
A pressure safety valve shall be provided if the downstream parts of the apparatus cannot take full container pressure.
5.19.1 Apparatus with a pressure safety valve
The pressure safety valve shall be designed to pass an air flow of 400 1/mm at a medium pressure not exceeding 30 bar.