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r <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />HEAT ASSIST METHODS <br />When working at temperatures below 85°F (18°C) or in situa- <br />tions where rapid cure is necessary, Fiber Glass Systems has <br />developed heat assist methods for curing adhesive bonded <br />pipe or fitting joints. <br />A. Electric Heating Collar <br />• The most effective method of <br />heat assist is electric heat col- <br />lars. Reusable 110/120 volt <br />heating collars are standard <br />(220/240 volt heating collars <br />are available on special order <br />and are shipped without the <br />male plug). <br />• The curing operation should occur as soon as possible <br />after the bonding operation. In cold weather, it is prefer- <br />able to bond only the amount of pipe that can be cured <br />during the same day. If a generator is used, assure the <br />voltage and power supply is adequate for all of the units <br />being used. When extension cords are used, make cer- <br />tain they can handle the total wattage of the collars used. <br />• When temperatures fall below 32°F (0°C), fiberglass insu- <br />lation should be added around heating collars to achieve <br />a proper cure. <br />• Pipe or sub -assemblies <br />can be moved before the <br />joints are cured if care is <br />taken and the joint is not <br />disturbed. Avoid bending <br />or excessive movement. <br />• Refer to Heating Collar In- <br />struction for complete op- <br />erating instructions. <br />Do not bend or fold heating collar; this may break the heating <br />elements and cause inadequate heat to cure the joint. <br />For Pipe and Fittings, use the same size heating collar as the <br />pipe size being installed, with the exception of flanges. Retract <br />protective mesh covering on Red Thread IIA 2" (50 mm) pipe <br />prior to use of heating collars. Do not use a heating collar that <br />is designed for a larger size pipe. <br />27 <br />