Laserfiche WebLink
jt <br />2i.8 | ehapter 6 <br />I <br />Desian oi pE piping Sysrems <br />ffif9no|,-pt_:t9"t" upplications, a z.s percent defleclion limiter6\:rFr|-- r _ _-_1rf--:-**^v'1u/ q,'vyurlslrLLltjllt <br />Iarge'safety iffi a safe <br />ure 3-1A. <br />re pipe <br />m8 <br />n from <br />acts to <br />deflection <br />tn <br />account <br />* <br />deflection' some engineers will design profile wail pipe and other non:p' <br />application s to a 5%t deflection limit, but ariow spot aefl{ctions up to T,s%field inspection. <br />The deflection l.imits for pressurized pipe are generalry rlwer tha' for nrpressurized 1:ipe. This is primarily due to strain considefations. Hoop st <br />pres s u r i z e d'ip u. rh ;';H,nH il ifi i: n"ff :HJI jfffi ;i:3J ;l]pressurizatio,n adds to the outer-fiber tensile strain. nut {,he internal iressreround the Pipe and, therefore, Eq. 3-L0 overpredicts the actuar long-ternfor pressurized pipe. safe ailowabre deflections for pressfirizea pipe are gTable 3-1,1, sprangle' and Handyrre) give equations for cor{ecting deflectionfor rerounding. <br />TABI.E 3-1"1 <br />Sate Deflection Limits for pressurized pipe <br />Bending strai' occurs i' the pipe wail as a result of ring deflectio'-ou <br />tensile strain at the pipe springri'e and outer-fiber .o,nfr"ssive strain at <br />and invert. I{hile strain Iimits of s%havebeen proporJg, Jurrrur.,.2) rep.that, o' tests of I'E pipe rnanufactured from pr.rurr"*Jtei resins and srto soil pressure only, "no upper rimit from a practical dJsign point of vieto exist for the bencring strain," Irr other words, <br />"s aeneJtiJn increases, tlperformance limit will'ot be overstraining but reverse curvature colla <br />Safe Defloction as % of Diameler <br />- Based on Long-Ternr D'sign Defrection ot Buriod pressurized pipe given ih ASTM F1962,