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1. Curing pipe joints d. CAUTION:Allow the heated handle the total wattage of the joint to cool until it is com- collars being used. See Section a. Center the heating collar fortable to the touch before 3, Tables 1.3.1 and 1.3.2. around the bonding area of any stress is applied to the the joint to be cured (See joint. Avoid bending or 2. Curing fitting joints Figure 1.6.18 Repeat this pulling at heat assist temp- When using Smith Fiberglass step for all joints s to be cured. eratures. Normal lifting to Products heating collars that b. Plug the heating collar into a remove the heat assist fasten with straps, the general 110/120 volt outlet. equipment will not harm procedure for curing adhesive- the joint. Any stresses on bonded fitting joints is the same c. Heat the joints for the length the pipe due to bending or as that for curing pipe joints. of time listed in Table 1.6.3. sagging should be relieved prior to heat cure. When using Smith Fiberglass NOTE:These cure times are Products heating collars that calculated using heating Pipe or subassemblies can fasten with snaps, the general collars from Smith Fiberglass be moved before the joints procedure for curing adhesive- Products. These heating are cured as long as care is bonded, in-line (thin wall) collars can reach a maximum taken that the lock of the fitting joints (such as couplings temperature of 330' F joint is not disturbed. Bend- and threaded adapters) is the (166' C). Using heating ing or excessive movement same as that for curing pipe collars that reach lower temp- is not advised. joints. However, because of eratures or have different the outside diameter size time vs. temperature curves If a generator is used, be sure difference between pipe and may result in improper cure that it will furnish enough standard (thick wall) fittings, of bond. Therefore, it is power to supply all of the units take the following steps: 10 recommended that only being used. Use 110/120 volt heating collars from Smith A.C.only.When extension cords a. Place the heating collar so Fiberglass Products be used. are used,make certain they can that as much of the bonding area as possible is covered TABLE 1.6.3 (See Figure 1.6.19). ADHESIVE CURE TIMES b. If the heating collar will not WHEN USING ELECTRIC HEATING COLLARS close, tie a string or wire Minimum Cure Time When Using around the collar to hold it Pipe Size DS-7000 or DS-8000 Series Adhesives in place. (in.) (mm) Pipe( ) Fittings 2 51 10 minutes 20 minutes c. Halfway through the cure 3 76 10 minutes 20 minutes time, rotate the heating a 102 10 minutes 20 minutes collar 180 degrees to assure complete coverage of the bonding area. d. Note: The next larger size heating collar can be used to cure thick wall fitting joints (such as elbows and tees). When a larger size is used, the heating collar does not have to be rotated, but the i cure time remains as shown. 3. Curing flange joints Figure 1.6.19 Figure 1.6.20 Flange joints may be heat cured by reversing the heating collar (1)To calculate adhesive cure times when using electric heating collars on sleeve couplings and threaded adapters,use Pipe column. i 15