BS 8468-1:2020 pdf download

BS 8468-1:2020 pdf download.Respiratory protective devices for use against chemical, biological, radiological and nuclear (CBRN) agents Part 1: Positive pressure, self-contained, open-circuit breathing apparatus — Specification.
2 Nonnative references
The following documents are referred to in the text in such a way that some or all of their content constitutes provIsons of this documents’. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
l3S 8468-8:2020. Respiratory protective devices for use against chemical, biological, radiological and nuclear (CRRN) agents — Part & Test methods
85 EN 134, Respiratory protective devices — Nomenclature ofcomponenr.s
85 EN 136. Respiratory protective devices — Full face masks — Requirements testing, marking UENi.3Z. Respiratory protective devices — Self-contained open-circuit compressed air breathing apparatus with full face mask — Requirements, testing, marking
135 EN 13274-1:2001. Respiratory protective devices — Methods of test — Port 1: Determination of Inward leakage and total inward leakage
I3SEMISOJ.6922. Respiro tory protective devices — Vocabulary and graphical symbols
3 Terms and definitions
For the purposes of this part of KS 8468, the terms and definitions givcn in KS EN 134, BS EN 137 and BS ENJSO 16972 and the following apply.
3.1 chemical agent
toxic chemical that can be disseminated to cause harm
NOTE Chemical agents include chemical warfare agents and toxic industrial chemicals
3.2 bIological agent
micro-organism that is a pathogen and that has the potential to be used intentionally to cause harm NOTE Human pachogens are relemiit to RPD sekction.
3.3 radiological agent
substance that emits ionizing radiation and that could be disseminated to cause harm 3.4 nuclear agent
radioactive matter resulting from a nuclear explosion or accidental release from a nuclear facility
3.5 positive pressure, sell-contained, open-circuit breathing apparatus (positive pressure SC BA)
.nlf-contained breathing apparatus wiich is designed to maintain the pressure In the mask above ambient pressure and in which the exhaled air passes, without recirculation. from the facepiece via the exhalation valve to the ambient atmosphere
NOTE This is constructed to enable the wearer to breathe air on demand from pressure vesstl(s). carr,rd by the wearer. via a pressure reducer and/or a lung governed demand valve connected to the facepiece
3.6 decontaminatIon
physical and/or chemical process of removing as much contamination as possible from people or equipment
4 RequIrements
4,1 General
SCBA br use again L&iks .sgents shaI be pimitive prr-uie equipment iunh,rtnIng Lu k.Iii..at.
Type 1 or Type 2. and conforming to the inward leakage specified in 4.4 of this British Standard and
conforming to the chemical agent permeation and penetration and resistance spedlied In 4.5 of this
British Standard.
Where the apparatus has been designed to be used at temperatures outside those specified in BS EN 137. the manufacturer shall have tested and marked the product appropriately.
4.2 Preconditioning
Samples shall be preconditioned In accordance with USEIU3.Z prior to visual Inspection and testing for inward leakage and chemical agent permeation and penetration.
4.3 VIsual inspection
Visual inspection shall be in accordance with 8S8468-8:2020, Clause 6. A minimum of two samples shall be inspected.
4.4 Inward leakage
The maximum Inward leakage shall be <0.01% when tested as a complete system In accordance with BS EN 13274-1:2001. 8.4c) with 10 test sublects. A minimum of two devices shall be tested. NOTE This requirement Is more stringent than the one given in BS E?l 137. Detection systems iAou?d Lake account of the rncreased sensitivity required. 4.5 Chemical agent permeation and penetration SCRA shall be resistant to chemical agents when tested as a complete system in accordance with BS 8468-8:2020. type CBRN3. using the HI) droplet patterns given in Figure land Figure 2 of this British Standard.