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Afilh <br /> p • 2St/0 (2s) <br /> P - 2(33000)t/D <br /> P - 66000t/0 <br /> p . hydraulic pressure (psi) <br /> S - fiber stress (Psi) <br /> 2 - for two pipe wells <br /> t - wall thickness (in.) <br /> 0 - nominal diameter (in..) . <br /> Ibis reduces to the minim required wall thickness for the saminal 6-in- <br /> diameter Schedule 40 pipe for the fridaY.lowden, as follows: <br /> t - PD/66000 (�) <br /> t . 2(290)6/66000 - O.OS3 in. <br /> Note: additional owner rewired factor of safety of 2. <br /> The wall thickness of the Schedule 40 nominal 6-in. diameter pipe is <br /> 0.no is. It will take approximately 4S years to reduce the original wall <br /> tilckness to 0.00 in., as follows: <br /> (0.290 - 0.053)/0.006 • 45 years = <br /> The wall thicbms for the Schedule 80 paminal 1-in. diameter Pipe is 0.179 <br /> is. The calculations are, as follows: <br /> t . 2(290)1/66000 - 0.009 in. <br /> (0.179 - 0.009j/0.00S - 34 years - <br /> The corr'osios.rate for the concrete is the bulkhead will be reduced by <br /> using Type Y sulfate resisting cement. In addition, the initial rate of acid <br /> attack will decrease rapidly because once the bulkhead valves are closed no - <br /> �-1 fres4 solution will contact the concrete. <br /> ' -16- <br />