COMPLIANCE INFO_2003-2005 - Laserfiche WebLink

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with a thin layer of adhesive to produce a good bond. To pre- vent contamination, apply ad- hesive to 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. c. Align and lock the joint. For 2" (50mm) pipe, insert spigot into the bell until surfaces touch, then push and turn at the same time until a lock is achieved (See Figure 1.6.12). Only a quarter turn to a half turn is usually needed. On 3" and 4" (75 and 100 mm) diameter pipe, or on fittings, pushing and turn- ing to lock the joint is impracti- cal and driving force must be used. If the adhesive or the pipe sur- faces are cool, push and hold Figure 1.6.12 1.6.13 for a few seconds to allow time for the adhesive to start flowing out of the tapered joint. If addi- tional force is needed, a rubber mallet ora 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 vis- ible in the joint. If any move- ment exists, the joint is not locked up, and the joint assem- bly procedure must be repeated. When using a hammer, place a strong board (2 x 4) flat across the bell. The first few raps should be light to prevent any tendency of the joint to back out (See Figure 1.6.13). When the adhesive starts squeezing out of the joint, use stronger blows. Proper pipe alignment is important. Main- tain back pressure against pre- viously assembled joints to avoid shaking them loose. Af- 15 1.6.14 ter the joint has started to make up, hit until no further engage- ment can be seen at the joint. When engagement stops, the joint is locked. Check forproper engagement by using the method described in Para- graph d. Note: Do not use this method where the spigot end would be hit. Use comealongs in this case. On 2"4" (50-100mm) diameter pipe, a three -pound (4 kg) shop hammer is adequate. 2. T.A.B. joint-T.A.B. joint installation procedures follow the normal bell and spigot operations of cleaning, adhesive mixing, etc. as described previously. The threads on the bond- ing surfaces are designed to im- prove the reliability of the joint, particularly under adverse condi- tions. Two T.A.B. wrenches are recommended when joining T.A.B. pipe (See Figure 1.6.14). Separate wrenches are available from Smith Fiberglass Products for each size pipe. The wrenches lock around the pipe and force the pipe into a very slight oval shape. Therefore, the wrenches must be placed 6" to 12" (150 to 300 mm) away from the joint to assure good joint make-up. PIN I�. i PIPE STRAP HANDLE Figure 1.6.15