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Reusable heating collars are energized by a 110/120 volt power source(1) (see Fig. 1.6.17). We recom- mend external heat to assure full adhesive cure when am- bient tempera- ture is below 70°F (21°C). It is desirable but not neces- sary for the curing opera- tion to imme- diately follow the bonding operation. However, it is preferable to bond only that amount of pipe and fittings that can be cured during the same day. 1. Curing pipe joints Center the heating collar around the bonding area of the joint to be cured (see Fig. 1.6.18). Repeat this step for all joints to be cured. b. Plug the heating collar into a 110/120 volt outlet c. Heat the joints for the length of time listed in Table 1.6.3. TABLE 1.6.3 Adhesive Cure Times When Using Electric Heating Collars (1) Note: 220/240 volt heating collars are available on special order. 240 volt collars are shipped without the male plug. n NOTE: These cure times are calculated using heat- ing collars from Smith Fiberglass Products. These heating collars can reach a maximum temperature of 330°F (166°C). Using heating collars that reach lower temperatures or have different time vs. tem- perature curves may result in improper cure of bond. Therefore, it is recommended that only heating collars from Smith Fiberglass Products be used. d. CAUTION: Allow the heated joint to cool until it is comfortable to the touch before any stress is applied to the joint. Avoid bending or pulling at heat assist temperatures. Normal lifting to re- move the heat assist equipment will not harm the joint. Any stresses on the pipe due to bend- ing or sagging should be relieved prior to heat cure. Pipe or subassemblies can be moved before the joints are cured as long as care is taken that the lock-up of the joint is not disturbed. Bending or excessive move- ment is not advised. If a generator is used, be sure that it will furnish enough power to supply all of the units being used. Use 100/120 volt AC. only. When extension cords are used, make certain they can handle the total wattage of the collars being used. See Section 3, Tables 1.3.1 and 1.3.2. 2. Curing fitting joints When using Smith Fiberglass Products heating collars that fasten with straps and/or snaps, the general proce- dure for curing adhesive bonded, in-line (thin wall) fit- ting joints (such as couplings and threaded adapters) is the same as that for curing pipe joints. However, be- cause of the outside diameter size difference between pipe and standard (thick wall) fittings, take the follow- ing steps: a. Place the heating col- lar so that as much of the bonding area as possi- ble is cov- ered (see Fig. 1.6.19). (2) To calculate adhesive cure time when using electric heating collars on sleeve couplings and threaded adapters, use "Pipe" column. Installation Instructions .7