“If a utility digs up a ductile iron pipe
inhibition and even a biocide, coming in three layers. Te product has been in test sites
for 14 years using corrosion probes to measure the corrosion rate under- neath the V-Bio. So far, readings show no corrosion is occurring. “We’re taking advantage of a rela-
tively new extrusion process and we’re enhancing the film by adding an anti- microbial component and a corrosion inhibitor,” Horn said. “So it provides an active aspect to the protection that traditional polyethylene encasement provides for iron pipe. Our industry bought the patent in December 2012 and introduced it to the marketplace in 2013 and it’s been doing pretty well.” In general, ductile iron pipe can do
well in the toughest of conditions. Many times, ductile iron pipe will be used in an underground environ- ment that’s going to be aggressive to iron pipe. Some soils can promote corrosion, which is the single thing that can have a negative impact on the
and returns it to the (metalcaster), or any scrap dealer, it can be made into new pipe. You can’t do that with PVC. Ductile iron pipe is simply the smart, strong, sustainable choice.”—Jeff Otterstedt
service life of ductile iron. Tat then is why it’s important to protect pipes from corrosion. “Ductile iron’s a tremendously strong
product and takes advantage of the strength to employ some very conserva- tive design assumptions when you go to decide what class of pipe to use for a given installation,” Horn said. “Taking advantage of that strength, you can get a tremendous service life with proper design and installation practices, includ- ing protection in certain aggressive soils.
“We do have a model that we use
as a risk-based model that evaluates the likelihood a soil would cause corrosion and balances that against the consequences of the corrosion related problem to come up with a series of recommendations for cor- rosion control that make it pretty easy for a utility engineer to know what to do.” As a whole, the industry is look- ing to improve the service that the product provides.
Ductile iron pipe is seen in the manufacturing state. December 2016 MODERN CASTING | 37
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