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6 leak detection equipment being used is suitable for use with flammable refrigerants, i.e. non-sparking, adequately sealed or intrinsically safe. • If any hot work is to be conducted on the refrigeration equipment or any associated parts, appropriate fire extinguishing equipment shall be available to hand. Have a dry powder or carbon dioxide fire extinguisher adjacent to the charging area. • No person carrying out work in relation to a refrigeration system which involves exposing any pipe work which contains or has contained flammable refrigerant shall use any sources of ignition in such a manner that it may lead to the risk of fire or explosion. • All possible ignition sources, including cigarette smoking, should be sufficiently far away from the site of installation, repairing, removing and disposal during which flammable refrigerant can possibly be released to surrounding space. Prior to work taking place, the area around the equipment is to be surveyed to establish any flammable hazards or ignition risks. Display “No Smoking” signs. • Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work. A degree of ventilation should continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally to the atmosphere. Safety check of the refrigeration equipment Where electrical components are being changed, they are to be “fit for purpose”, and to the correct specification. At all times the manufacturer’s maintenance and service guidelines are to be followed. If in doubt consult the manufacturer’s technical department for assistance. The following checks should be applied to installations using flammable refrigerants: • That the charge size is in accordance with the room size within which the refrigerant containing parts are installed. Hydrocarbon charge sizes are typically 40% to 50% of CFC, HCFC and HFC charge sizes. • That ventilation machinery and outlets are operating adequately and not obstructed. • Confirm the operation of equipment such as refrigerant leak detectors and mechanical ventilation systems. • If an indirect refrigerating circuit is being used, the secondary circuit should be checked for the presence of refrigerant. • Ensure that marking to the equipment continues to be visible and legible. Marking and signs that are worn should be corrected. • Check that refrigeration pipe or components are not installed in a position where they are likely to be exposed to any substance which may corrode refrigerant-containing components, unless the components are constructed of materials which are inherently resistant to being corroded or are suitably protected against corrosion. 133 Safe Refrigerant HandlingPDF Image | Manual for Refrigeration Servicing Technicians
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