Having the same outside diameter and having different wall thick- nesses (because plastic pipe is not as strong as iron pipe) means the inside diameter of iron pipe is bigger than the inside diameter of the same nominally sized plastic pipe. That means less energy is
required to pump the same volume of water or waste water through the ductile iron pipe. “Tink about it this way. Try drink-
ing through a regular straw compared to a coffee stirrer,” Otterstedt said. “It takes a lot more energy to drink through the smaller diameter coffee stirrer. Te same goes for pumping water through ductile iron pipe com- pared to PVC.” Gaston echoed that. “When you add up those energy
savings, day after day, year after year, over the life of a pipeline project, the electric pumping cost savings associ- ated with ductile iron pipe are stag- gering,” Gaston said. “Te (reduced)
Palletized zinc-coated ductile iron pipe awaits shipment
greenhouse gas emissions (due to) requiring less electricity to operate a ductile iron pipeline is stagger- ing. Te financial savings available through a present worth calculation due to those lower operating costs is absolutely staggering. “We’ve got all these energy effi-
ciency stickers on our cars and on our appliances. We ought to put them on our pipe materials because the energy savings associated with ductile iron pipe compared to plastic pipe, high density polyethylene pipe and other types of pipe is just absolutely remarkable.”
Ductile iron pipe is made from recycled iron and steel products. December 2016 MODERN CASTING | 39
Courtesy of McWane Ductile.
Courtesy of AMERICAN.
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