Saskatchewan City’s large diameter storm sewer project was the first installation of 42” (1050 mm) and 48” (120 mm) PVC pipe in the world. At the deepest point on the site 42" (1050 mm) diameter PVC DR51 pipe was buried under 22 ft. (6.7 m) of fill. Sixteen years later a deflection measurement was taken and the vertical measurement versus the theoretical diameter of 42.6 in. (1083 mm) was measured to be 0.5 in. ( 12.6 mm), or 1.2% vertical deflection. The pipe is expected to remain stable with very little deflection over the long term.
“The reasons for choosing PVC were twofold: time and money,” says VUS president Allan Jones. “Polyethylene is great if you have long straight runs that don’t require numerous, expensive fittings to make the pipe work…otherwise it becomes extremely expensive,“ he explains.
Faced with boring through wetlands and under a creek to improve its sanitary sewer system, the City of Elmhurst, Ill, chose new large diameter retrained–joint PVC pipe and horizontal directional drilling.
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