Please activate JavaScript!
Please install Adobe Flash Player, click here for download

MERCANTA

www.mercanta.com 3.0 Protective Hoods Protective hoods combine respiratory and complete head protection in one unit. They are available in various materials, depending on their application. Protective hoods can either be equipped with a gas/particle filter (like filter masks), or they feature connection with an airline-assembly, from where the wearer can obtain breathable air. The former type is mainly used as escape-hood in case of fire, or as light duty chemical hood and serves as a negative pressure device. The latter type serves as a positive pressure unit and may be used as sand-blast hood, or heavy duty chemical hood, wher- ever the toxic or particle concentration of the air exceeds the capacity of the filter. 4.0 Airline Units Accidents in confined spaces continue to be a major source of danger at work. In recent years there have been approxi- mately 5 % of the total number of people killed at work in such areas. The reasons for these tragic accidents are various but usually include a lack of knowledge by the victims with regard to the procedures and equipment. Therefore advanced measures such as action plans, risk assessment, testing and monitoring of the atmosphere, proper communication procedures and the proper choice of appropriate PPE has become an essential task before entering a confined space. Fresh air breathing apparatus (hose-masks) are simple units consisting of a full face mask and a breathing tube, from which fresh air can be obtained. These are always negative pressure devices. The breathing resistance, which increases with the length of the hose, makes the application of a hose- mask difficult and restricted. Usually tube lengths are limited to 10 meters so that hose-masks have been widely replaced by compressed-air airline units where lung-demand regula- tors eliminate the breathing resistance. This advantage allows for a high distance between the wearer and the air-supply resulting in an unlimited range of applications. Airline units are usually supplied as integral units featuring a full face mask with a speech diaphragm, a demand valve (which supplies air upon demand, i.e. when breathing, and builds up a slight positive pressure inside the mask which results in a better sealing) or a constant flow valve (which supplies air in a constant flow, independent whether the wear- er breathes or not – this results in a cooling effect inside the mask keeping the visor free from fogging), a pressure reduc- ing valve, an airline and a trolley with compressed air bottles. A harness usually holds all valves and the airline in place. Additional features include alarm devices and an escape set, in case the air supply gets cut off accidentially. 5.0 Self Contained Breathing Apparatus (“SCBA”) Sets They are designed for use in extremely toxic areas with high gas concentrations or oxygen deficiency where a high degree of mobility is required and are available for working or as escape type apparatus. The working type SCBA basically consists of a harness and carrying frame for mounting the assembly onto the body, shoulder straps and a waist belt, an audible warning device, a compressed air cylinder and a full face mask. The mask is either supplied with a demand type regulator or with a positive pressure type regulator. The latter is approved for use in extremely toxic atmospheres where even minute levels of inward leakage into the face piece would be dangerous. The escape type apparatus is equipped with a mouthpiece respirator instead of a full face mask and is provided for quick donning during an emergency and for facilitating an escape from dangerous atmospheres. Please refer to the catalogues of our associates Messrs. Rosenbauer International for a wide choice of breathing apparatus sets. Respirators are tested to the relevant European Standards and CE marked. All respirators carry the CE mark plus the European Standard and performance category markings. EN149:2001 - Filtering face piece EN149:1991 - Particulate respirators EN405:2002 + - Valved filtering half mask respirators for respirators A1:2009 for gases and/or particulate matter EN132:1999 - Airline units EN140:1999 - Halfmask face pieces EN136:1998 - Full face masks EN137:2007 - Self-contained open circuit compressed air breathing apparatus EN141:2000 - Gas & vapour filters EN143:2007 - Particulate filter EN146 - Powered hoods & helmets EN147 - Powered full face masks EN270 - Heavy duty supplied air EN371:2001 - Gas and/or combined filters for use against low boiling organic compounds EN1139:2003 - Respirators EN402:2003 - Escape apparatus SCBA with full face mask or mouth piece assembly EN1146:2005 - Compressed air escape apparatus with hood EN1835 - Light duty compressed airline breathing apparatus EN12941:2009 - Powered hoods & helmets EN12942:2009 - Powered respirator full face masks 47

Pages Overview