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SECTION , �.�,... Blow Dryer Bell End Spigot End FIGURE 1.6.10 collar is used to prewarm, place the joint together dry, then heat the O.D. of the bell to avoid contaminat- ing the spigot. CAUTION: Do not use chemical heat packs for prewarming. b. Brush adhesive on both surfaces, applying a thin uniform coating (see Fig. 1.6.11). Adhesive should FIGURE 1.6.11 always be worked into the machined surface by ap- plying pressure during application. This will "wet out" the machined surface and maintain the re- quired thin bond line. Be sure that adhesive is deep down into the bell past the insertion depth and that all machined taper surfaces on the spigot and the cut end of the pipe are uniformly covered. Excess adhesive will make the joint more diffi- cult to lock and can result in a flow restriction. Wet out the machined surfaces with a thin layer of adhesive to produce a good bond. To prevent cont- amination, apply adhesive to the bell first. Connections into fittings are made using the normal bell and spigot method. A threaded (T.A.B.) spigot can be bonded into a smooth bell (fitting), or a smooth spigot can be bonded into a threaded (T.A.B.) bell. 41 Align and lock the joint. For 2" (50 mm) pipe, in- sert spigot into the bell until surfaces touch, then push and 0 turn at the same time until a lock is achieved (see Fig. 1.6.12). Only a quarter turn to a half turn is usually needed. On 3" and 4" (75 mm and 100 mm) diameter pipe, or on fittings, pushing and turning to lock the joint is impractical, and driving force must be used. If the adhesive or the pipe surfaces are cool, push and hold for a few seconds to allow time for the ad- hesive to start flowing out of the tapered joint. If additional force is needed, a rubber mallet or a strong piece of wood and a hammer to drive the pipe together is the preferred method. d. Check lock up by moving free end of pipe in an up- and-down or side-to-side motion. The movement must be sufficient to move the joint being checked. No movement should be visible in the joint. If any movement exists, the joint is not locked up, and the joint assembly procedure must be repeated. When using a hammer, place a strong board (2x4) flat across the bell. The first few raps should be light to pre- vent any tendency of the joint to back out (see Fig. 1.6.13). FIGURE 1.6.13 When the adhesive starts squeezing out of the joint, use stronger blows. Proper pipe alignment is important. Maintain back pressure against previ- ously assembled joints to avoid shaking them loose. After the joint has started to make up, hit until no further engagement can be seen at the joint. When engagement stops, the joint is locked. Check for proper engagement by using the method described in paragraph d. 12 Installation Instructions