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always be worked into the c. Align and lock the joint. For exists,the joint is not locked machined surface by apply- 2" (51 mm) pipe, insert up, and the joint assembly ing pressure during applica- spigot into the bell until sur- procedure must be repeated. tion. This will "wet out" the faces touch, then push and When using a hammer, machined surface and turn at the same time until a place a strong board (2 x 4) maintain the required thin lock is achieved (See Figure flat across the bell. The first bond line. Be sure that 1.6.12). Only a quarter turn few raps should be light to adhesive is deep down into to a half turn is usually prevent any tendency of the the bell past the insertion needed. On 3" and 4" (76 joint to back out (See Figure depth and that all machined and 102 mm)diameter pipe, 1.6.13). taper surfaces on the spigot or on fittings, pushing and and the cut end of the pipe turning to lock the joint is When the adhesive starts are uniformly covered.Excess impractical and driving force squeezing out of the joint, adhesive will make the joint must be used. use stronger blows. Proper more difficult to lock and pipe alignment is important. can result in a flow restric- If the adhesive or the pipe Maintain back pressure tion.Wet out the machined surfaces are cool, push and against previously assembled surfaces with a thin layer of hold fora few seconds to joints to avoid shaking them adhesive to produce a good allow time for the adhesive loose. After the joint has bond. To prevent contami- to start flowing out of the started to make up, hit until nation, apply adhesive to tapered joint. If additional no further engagement can bell first. force is needed, a rubber be seen at the joint. When mallet or a strong piece of engagement stops, the joint Connections into fittings are wood and a hammer to is engagement Check for proper made using the normal bell drive the pipe together is the engagement by using the and spigot method. A preferred method. method described in Para- threaded (T.A.B.) spigot can d. Check lock up by moving graph d. be bonded into a smooth bell (fitting), or a smooth free end of pipe in to up-side Note: Do not use this spigot can be bonded into a andown m side- method where the spigot threaded (T.A.B.) bell. motion. The movementt must end would be hit.Use come- be sufficient to move the alongs in this case.On 2"-4" joint being checked. No (51-102 mm)diameter pipe, movement should be visible a three-pound (4 kg) shop in the joint.If any movement hammer is adequate. 2. T.A.B.joint-T.A.B.joint installa- tion procedures follow the normal bell and spigot opera- tions of cleaning, adhesive mixing, etc. as described pre- viously. The threads on the bonding surfaces are designed Figure 1.6.12 to improve the reliability of the joint, particularly under adverse conditions.Two T.A.B.wrenches are required when joining T.A.B. pipe (See Figure 1.6.14). Separate wrenches are avail- able from Smith Fiberglass < Wood Products for each size pipe. The wrenches lock around the - . pipe and force the pipe into a Figure 1.6.13 Figure 1.6.14 very slight oval shape. There- 13