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~i <br /> <br /> SUBJECT: HDPE Pipe Desi n <br />GOLDER Job Number: 933-2720 Made by BES Date: 8/25/94 <br />ASSOCIATES Ref: Checked: Sheet of <br /> Reviewed: <br /> Flb Nuns: ppe7l10.wgt <br />CALCULATIONS: (cont.,) <br />-Apply Correction Factor <br />A correction factor needs to be added to the overburden stress to <br />compensate for the pertorations within the pipe. The following equation <br />will calculate the design stress that the <br />pipe must be able to withstand. <br />Dstress =Over * (SApipe / (SApipe -Aper}) <br />where; Dstress =Design stress, psf <br />Over =Overburden, psf <br />SApipe = Surtace Area of pipe per linear foot, square feet <br />Aper =Area of pertorations per linear foot <br />Diameter of perforations = 0.5 inch <br /># of holes per foot = 4 <br />Over = 145.83 psi <br />SApipe = 527.79 inches Aper = 0.79 inches <br />Dstress = 146.05 psi <br />- Design the pipe to withstand wall crushing <br />Sa=[(SDR -1) / 2] '~ Pt <br />where: Sa =Actual compressive stress, psi <br />SDR =Standard Dimension Ratio <br />Pt =External Pressure, psi <br />SDR = 11 Pt = 146.05 psi <br />Sa = 730.25 psi <br />Comp. Yield Strength of HDPE pipe = 1500 psi <br />Safety Factor =Yield Strength / Sa <br />SF = 2.05 <br />