Emergency escape SCBA - EEBD
An escape SCBA, part of the EEBD - emergency escape breathing device - equipment range is a class 3 personal protective equipment (PPE) especially designed for hazardous situations that imply an emergency evacuation. An escape SCBA or a self-contained self-rescuer – SCSR - can only be used for emergency escape situation and in no way for on-site interventions or to rescue someone in trouble.
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Escape SCBA from standard self-contained breathing apparatus
Standard self-contained breathing apparatus are called open-circuit (OC SCBA). This means that inspired air comes from a compressed air cylinder and exhausted air is released outside the facepiece (mask). This equipment represents a high level of respiratory protection and is compliant with the EN137 standard related to compressed air self-contained breathing apparatus.
These units are well suited for a large number of applications (industry, marine, confined space entry…) and for almost any intervention situation (installation monitoring in non-breathable areas, specific works, rescue…). escape SCBAs and SCSRs are short duration atmosphere providing devices designed for emergency situations.
Particularly simple, easy and quick to don, emergency escape SCBA offer clean breathable air on a determined period in order to urgently and safely evacuate. They can only be used in emergency evacuation situations and in no way for on-site interventions or to rescue someone in trouble.
These tiny escape self-contained breathing apparatus are compacted in a carrying bag and usually feature an emergency escape hood and a lower autonomy compared to standard SCBAs (from 10 to 20 minutes). Opening the bag instantly releases air from the compressed air cylinder thanks to a pin system. Then the user just needs to pull the hood on his/her head to breathe normally and safely during the hazardous area evacuation.
Self-rescuer – SCSR - Closed-circuit SCBA
As for open-circuit self-contained breathing apparatus (OC SCBA) there are two categories of CC SCBA (closed circuit): devices for on-site interventions and emergency escape breathing devices – also called self-contained self-rescuer or SCSR.
In term of emergency evacuation, closed-circuit self-contained breathing apparatus, self-rescuer masks are primarily used in mines, tunnels or for confined space entry: go to the confined space entry training page. There are two major different operating principles:
Self-rescuer with compressed oxygen
A self-rescuer with compressed oxygen releases oxygen from the box opening. Then the user breathes from the bag. Expired air goes through lithium hydroxide to filter CO2. Cleaned air is then re-injected into the breathing bag to be re-oxygenated and breathed once again.
Self-rescuer with chemical oxygen
An SCSR with chemical oxygen features a KO2 cartridge (potassium superoxide). Humidity and carbon dioxide from expired air chemically reacts with KO2 while carbon dioxide is fixed. This chemical reaction releases oxygen into a breathing bag to be safely breathed by the user.