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ENVIRONMENTAL F: ALTH <br />T.A.B. JOINT <br />T.A.B. joint installation procedures <br />follow the normal bell and spigot op- Pin <br />erations of cleaning, adhesive mixing, <br />etc. as described previously, but also <br />involve rotating the joint components <br />to engage the matching threads. The pipe <br />threads on the bonding surfaces are Strap <br />designed to improve the reliability Handle �. <br />of the joint lock-up, particularly un- <br />der adverse conditions. Two TA.B. <br />wrenches or strap wrenches (RidgidO No. 2-P) are recom- <br />mended when joining 3" (75 mm) and larger T.A.B. pipe. Sep- <br />arate T.A.B. wrenches are available from the factory for each <br />size pipe. The wrenches must be placed 6" to 12" (150 to 300 <br />mm) from the joint to minimize ovaling and ensure proper <br />make-up. <br />Caution: Improper use of strap wrenches can cause point - <br />loading damage and/or bad joints that are locked up. To pre- <br />vent damage to the pipe wall, wrap the strap wrench around <br />the pipe as shown. <br />-dftk Cover all machined areas on the spigot and at least one- <br />half inch beyond the last thread in the bell with the ad- <br />hesive. <br />• Screw the pipe together by hand, ensuring the joint is <br />not cross threaded. Two inch (50 mm) diameter pipe can <br />be hand tightened. To ensure complete joint make up for <br />3" and 4" (75 and 100 mm) diameter pipe, use T.A.B. <br />wrenches. <br />• DO NOT OVER TIGHTEN. <br />• Check lock up by moving <br />free end of pipe in an up-and- <br />down or side-to-side motion. <br />The movement must be suf- <br />ficient to move the joint being <br />checked. No movement of the <br />joint components should be <br />visible in the joint. If any movement exists, continue to <br />tighten until no movement is visible. <br />Connections into fittings are made using the normal bell and <br />spigot methods. <br />26 <br />