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SECTION 4 <br /> SMITH <br /> JOINING METHODS <br /> 1.4.1 General Concepts stronger than most piping mechanical locking action—when <br /> 1. Proper installation is the key to systems. combined with the adhesive — <br /> achieving a highly-reliable, 6. To achieve the most reliable promotes positive make-up of the <br /> adhesive-bonded, matching piping system, it is essential joint and prevents backout during <br /> taper, bell and spigot joint. that the installation crew be adhesive curing. <br /> 2. Matching taper angles on familiar with the joining tech- Pipe is supplied with one end <br /> spigot and bell ends make it niques described in this man- tapered (the spigot) and the other <br /> possible to lock up a joint by ual. Note especially Section 6. end belled(integral bell or factory- <br /> wedging the spigot into the bell 7. Proper and safe methods of bonded coupling) to accept a <br /> so that it takes significant force testing are recommended to <br /> tapered spigot. <br /> to separate them. Proper lock assure that the bonded joints in Fittings are manufactured to accept <br /> up is essential. the piping system have been either the tapered spigot or T.A.B. <br /> I A very thin line of adhesive properly bonded and cured. spigot end of the pipe.Tapers can <br /> (called the bond line or glue See Sections 6 and 7. be made in the field with tools <br /> line)between the two matching 1 .4.2 Bell and spigot joining specially designed for this pur- <br /> tapered surfaces is essential to method pose. (See Section 5.) Bells cannot <br /> achieve optimum joint strength. be field-made.When a belled end <br /> The adhesive-bonded,tapered bell is needed, use a bell x bell <br /> 4. Cool weather installations and spigot joint is the primary join- coupling. <br /> require different bonding ing method for 2"-4"(51-102 mm) Note: For pipe that is bundled in <br /> procedures from warm weather pipe-to-fittings. 15-ft. (5-m) lengths, each bundle <br /> installations. See Section 6. The T.A.B. (threaded and bonded) will have an equal number of <br /> 5. Proper installation results in joint is the primary joining method spigot x spigot and bell x spigot <br /> joint strength equivalent to or for pipe-to-couplings. The pipe lengths. <br /> Z_ <br /> O O <br /> O O -V 4 <br /> O O <br /> BELL X SPIGOT JOINT T.A.B.JOINT <br /> Figure 1.4.1 Figure 1.4.2 <br /> 7 <br />