Self-contained breathing apparatus

Self-contained breathing apparatus, SCBA – or more precisely open-circuit self-contained breathing apparatus (OC SCBA) – are personal protective equipment made for use when the oxygen rate in ambient air is under 19.5% of the volume (presence of asphyxiating gas or fumes), in presence of irritating gases or when the pollutant concentration exceeds 60 times its occupational exposure limit value (OEL). The use of an SCBA respirator implies first to follow specific SCBA training.

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Supplied air respirator

Before choosing supplied air respiratory protective equipment, it is essential to deeply evaluate risks on the concerned site and to implement the proper equipment to fulfill the required task. Thus it is necessary to ask the right questions:

Primary air supply

It can either be the plant or laboratory’s air supply system, a supplied air compressor or even compressed air cylinders (usually on a breathing air cart). If using the plant compressed air network, it would be necessary to check if this breathable air network is equipped with a monitoring system to be sure that air has been purified from water, oil and gases (carbon oxides and volatile organic compounds).

Low pressure alarm

There are two different ways for a user to be alerted in case of pressure reduction on the supplied air respirator system. Either through a line whistle (whistling below a certain air pressure level), or through a DS4 (automatic distress signal) that emits an audiovisual warning.

Last resort air reserve

Is it required to have a last resort air reserve in case of accidental interruption of the breathable air supply? If yes, it would be necessary to wear a last resort compressed air cylinder at the belt and along the leg to safely evacuate the hazardous area.

Supplied air respirator for asbestos removal: The RAS Asbestos

The RAS Asbestos is a specific device especially designed for asbestos removal applications, from the classic supplied air system (standard RAS). The RAS Asbestos operates the same way than classic airline respirators and features an additional filter located in the medium pressure supply hose.

This P3 category filter eliminates particles from 0.01 micrometers, protecting its user against asbestos particles that penetrate the "Pigtail" connector when connecting to the supplied air system.

Its harness is also made of a slicker material in order to facilitate the decontamination after use and the device servicing.

Supplied air respirator system composition

A supplied air respirator system is composed by three elements. A breathable air supply using either a breathing air cart or an existing breathable air network equipped with an air purifying unit. The second component is a harness the user wears which gathers every connections and lastly a respiratory mask – same as those used with self-contained breathing apparatus (quarter turn connection).

Breathing air cart

The Modulair is a compact and easy to use breathing air trolley especially designed to provide a portable breathable air supply in difficult to access locations. Versatile and robust, it is composed by a lightweight breathing air hose reel made of stainless steel and a cylinder holder.

Air purifying unit for supplied air respirator system

This is a two stage purifying system that eliminates particles, water and oil droplets and smell from the plant breathable air network. The air quantity is thus theoretically unlimited. This way, supplied air respirators are ideal for long term works – contrary to an SCBA. The purifying unit remains necessary in order to ensure the purity of air being injected into the facepiece.

Facepiece selection

All of our airline respirator range is manufactured by Dräger or the other manufacturer Scott Safety by 3M – both well known for quality and standard compliance - and are fully compatible with a large range of facepieces (half mask, full face mask, supplied air respirator hood…) in order to meet the most specific requirements.