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`" pjpE d~ ~PCASTICS GROUP ENGINEERING DATA <br />CERTAIN-TEED PVC PIPE ~ ode"c.40.22-07H <br />Effective 3.1578 <br />MAXIMUM Replaces 43o-72 <br />~~~ ALLOWABLE BENDS <br />Whenever a piece of pipe is deflected, internal stresses are <br />induced in the material. When the pipe is subjected to its <br />Design Stress (2000 psi) in the circumferential direction, <br />we know that only half of this or 1000 psi is in the longitudinal) <br />dizection. When the pipe is deflected, stresses are added only <br />longitudinally - tension on the outside of the curve, and <br />compression on the inside of the curve. The effect of pressuring <br />a pipe, which is now deflected, is to combine the stresses. <br />This is additive on the outside of the curve - both being tensile <br />stresses - and is cancelling on the inside of the curve - one <br />being tensile and the other compressive. It is then the out- <br />side of the curve which is of critical consideration because <br />the additive effect in this area causes the longitudinal stress <br />of the material to increase. <br />• <br />