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Self-contained breathing apparatus
A self contained breathing apparatus, or SCBA, sometimes referred to as a Compressed Air Breaching Apparatus (CABA) or simply Breathing Apparatus (BA) is a device worn by rescue workers, firefighters, and others to provide breathable air in a hostile environment. When not used underwater, they are sometimes called industrial breathing sets. The term "self-contained" differentiates SCBA from other apparatus connected to a remote supply by a long hose. If designed for use under water, it is called SCUBA, or self-contained underwater breathing apparatus.
An SCBA typically has three main components: a high-pressure tank (e.g., 2200 psi to 4500 psi), a pressure regulator, and an inhalation connection (mouthpiece, mouth mask or face mask), connected together and mounted to a carrying frame.
There are two kinds of SCBA: open circuit and closed circuit.
The closed-circuit type filters, supplements, and recirculates exhaled gas: see rebreather for more information. It is used when a longer-duration supply of breathing gas is needed, such as in mine rescue and in long tunnels, and going through passages too narrow for a big open-circuit air cylinder. Before open-circuit SCBA's were developed, most industrial breathing sets were rebreathers, such as:-
Examples of modern rebreather SCBAs are
For rebreathers used underwater, where they have the advantage of not releasing tell-tale bubbles, making it more difficult to detect divers involved in covert operations, see frogman.
Open-circuit industrial breathing sets are filled with filtered, compressed air, the same air we breathe normally. The compressed air passes through a regulator, is inhaled by the user, then exhaled out of the system, quickly depleting the supply of air. Most modern SCBAs are open-circuit.
An open-circuit rescue or firefighter SCBA has a full-face mask, regulator, air cylinder, cylinder pressure gauge, and a harness with adjustable shoulder straps and waist belt which lets it be worn on the back. The air cylinder usually comes in one of three standard sizes: 30, 45 or 60 minutes. The relative fitness, and especially the level of exertion of the wearer, often results in variations of the actual usable time that the SCBA can provide air, often reducing the working time by 25% to 50%.
Air cylinders are made of aluminum, steel, or of a composite construction (usually Carbon-Fiber wrapped.) The composite cylinders are the lightest in weight and are therefore preferred by fire departments (UK: fire brigades), but they also have the shortest lifespan and must be taken out of service after 15 years. Air cylinders must be hydrostatically tested every 3 years for composite cylinders, and every 5 years for metal cylinders. During extended operations, empty air cylinders can be quickly replaced with fresh ones and then refilled from larger tanks in a cascade system or from an air compressor brought to the scene.
Open circuit SCBA will be either "positive pressure" or "negative pressure" operation. A "negative pressure" SCBA may be used with a standard facemask instead of filter cannisters, and air is delivered to the wearer when he breathes in, or in other words, reduces the pressure in the mask to less than outside pressure, hence the name "negative pressure". The limitations of this are obvious, as any leaks in the device or the interface between the mask and the face of the wearer would reduce the protection offered. "Positive pressure" SCBA addresses this limitation. By careful design, the device is set to maintain a small pressure inside the facepiece. Although the pressure drops when the wearer breathes in, the device always maintains a higher pressure inside the mask than outside of the mask. Thus, even if the mask leaks slightly, there is a flow of clean air out of the device, automatically preventing inward leakage under most circumstances. Although the performance of both types of SCBA may be similar under optimum conditions, this "fail safe" behaviour makes a "Positive pressure" SCBA preferable for most applications. As there is usually no air usage penalty in providing positive pressure, the older "Negative pressure" type is in most cases an obsolete configuration and is only seen with older equipment.
There are two major application areas for SCBA, fire fighting, and industrial use.
In the USA, SCBAs used in firefighting must meet guidelines established by the National Fire Protection Association, NFPA Standard 1981. If an SCBA is labeled as "1981 NFPA compliant", it is designed for firefighting. The current version of the standard was published in 2002. Similarly, the National Institute for Occupational Safety and Health (NIOSH) has a certification program for SCBA that are intended to be used in chemical, biological, radiological, and nuclear (CBRN) environments. See NIOSH Approved SCBAs.
Any SCBA supplied for use in Europe must comply with the requirements of the Personal Protective Equipment Directive (89/686/EEC). In practice this usually means that the SCBA must comply with the requirements of the European Standard EN 137 : 2006. This includes detailed requirements for the performance of the SCBA, the marking required, and the information to be provided to the user. Two classes of SCBA are recognised, Type 1 for industrial use and Type 2 for fire fighting. Any SCBA conforming to this standard will have been verified to reliably operate and protect the user from -30°C to +60°C under a wide range of severe simulated operational conditions.
The Royal Australian Navy uses the Open Circuit Compressed Air Breathing Apparatus (OCCABA), a backpack-style, positive pressure breathing apparatus, for fire-fighting roles.
Also known as
In Australia different firefighting agencies refer to SCBA by different acronyms in general terms. For example, the New South Wales Rural Fire Service refers to SCBA as CABA, Compressed Air Breathing Apparatus, and the New South Wales Fire Brigades refers to it as BA, Breathing Apparatus. Despite the different names, SCBA, CABA and BA here all refer to the same type of Open-circuit equipment.
Among the leading manufacturers of SCBA for the USA fire service are: MSA, Draeger, Survivair, Interspiro, Scott, and ISI (International Safety Instruments).
Siebe Gorman produced a number of SCBA units which were as follows - Airmaster MK 1 (blue back plate); Airmaster MK 2 (chrome plated back plate); Firefighter; along with other specials for the armed forces
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Self-contained_breathing_apparatus". A list of authors is available in Wikipedia.|