Selection of Pipe SDR
In most, although not necessarily all, trenchless applications, the pipe that withstands the pulling stresses during installation can withstand the vertical overburden and traffic pressures. The pipe stresses experienced during construction are higher than those caused by vertical pressures. However, each application is different; it is possible that a specific application can require a different SDR. An engineering analysis is suggested for very deep or very shallow installations. Deep installations may be subject high overburden pressures, and shallow installations may be subject to high concentrated traffic loads that the pipe has to withstand. Additional details are provided in Chapter 16 of the Plastic Pipe Institute (PPI) Handbook of Polyethylene Pipe, which is readily available at www.plasticpipe.org/pdf/chapter16.pdf.