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�CE­. ! "' D <br />JP.i! i a *J,I <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />PART ONE <br />INSTALLATION INSTRUCTION FOR RED THREAD <br />IIA AND DUALOY 3000/L PIPE <br />Primary Piping <br />• Proper installation is the key to achieving a highly reli- <br />able, adhesive bonded, matching taper, bell x spigot <br />joint. <br />• Matching taper angles on spigot x bell ends make it pos- <br />sible to lock up a joint by wedging the spigot into the bell <br />so that it takes significant force to separate them. Proper <br />lock up is essential. <br />• A very thin line of adhesive (called the bond line or glue <br />line) between the two matching tapered surfaces is nec- <br />essary to achieve optimum joint strength. <br />• Proper installation results in joint strength equivalent to or <br />stronger than the piping systems. <br />• To achieve the most reliable piping system, it is essential <br />that the installation crew be familiar with the joining tech- <br />niques in this manual. <br />Joining Systems <br />The adhesive bonded, tapered bell x spigot joint is the primary <br />joining method for 2"-6" (50- 150 mm) pipe -to -fittings. When <br />combined with the adhesive, the mechanical locking action <br />promotes positive makeup of the joint and prevents back out <br />during adhesive curing. <br />The T.A.B. joint is the primary joining method for pipe -to -cou- <br />plings on Red Thread IIA. Red Thread IIA pipe is supplied with <br />T.A.B. spigot x T.A.B. spigot ends. Fittings are manufactured <br />to accept either a tapered spigot or T.A.B. spigot end of the <br />