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      Ductile Iron Pipe Linings

      Various Interior and Exterior ductile iron pipe linings enhance the anti-corrosiveness of the pipes. Unprotected pipes in harsh environments with corrosive soil would have much shorter lifespans between 20 and 40 years. Both the American National Standards Institute and the American Water Works Association (AWWS) promote the use of Loose Polyethylene Sleeving (LPS) as a standard to protect ductile iron piping from corrosion. Depending on the application, environmental stress factors such as the corrosiveness of soil and your particular Design Decision Model (DDM) we would recommend a combination of the interior and exterior linings below.

      Ductile Iron Pipe Interior Linings

      PUR Polyurethane

      This is a great option for passive protection. The most common type of PUR degradation happens during the handling and installation process. If polyurethane is the right choice for your interior lining then expect to receive strict handling, transport and installation procedures to maintain the integrity of the PUR coating. 

      This particular type of coating boasts high resistance for the transmission of drinking water, wastewater, de-mineralized water as well as industrial water and gas. 

      Cement Mortar

      Cement Mortar interior lining is the most common form of protection for water applications. The cement is applied during the manufacturing process through advanced centrifugal techniques. A 1:2 to 1:3 ratio of cement and sand is commonly used before application. A cement lining is highly effective at reducing the corrosive effects of soil.

      Ductile Iron Pipe Exterior Linings

      Exterior linings are often used to extend the already impressive lifespan of the ductile iron pipe. Generally, ductile iron piping will be protected by one or more exterior coatings/linings.

      Loose Polyethylene Sleeving (LPS)

      LPS is a loose sleeve of polyethylene that will wrap the pipe. The wrap will overlay all bells of any joints as well. 

      LPS has been found to be highly effective at mitigating corrosion. In high environmentally stressful environments, LPS may be installed over a zinc coating to provide added protection.

      LPS creates a physical separation of the outer soil from the pipe as well as creates an impermeable barrier for groundwater.

      LPS happens to be the preferred and most cost-effective lining for the AWWS and the Ductile Iron Pipe Research Association (DIPRA). 

      Zinc Coating

      Zinc coatings are popular in Europe, Australia and New Zealand for an added layer of protection. In the United States, Zinc coatings are gaining popularity, but 85% of domestic soil has been deemed non-corrosive eliminating the need for the added protection zinc coatings can offer.

      Bituminous Coatings

      This style of coating is a black viscous mixture of hydrocarbons. In the instance of Ductile Iron Pipe, this the of coating is a temporary solution intended to provide protection during transport and installation. 

      Water-based Pipe Coatings

      This type of coating is an environmentally friendly coating applied to both the interior and exterior of ductile iron piping. This coating will help protect against corrosion while avoiding volatile organic compounds that may be damaging to the environment over time. Water-based coatings will also serve to protect drinking water from contamination in potable water lines as well s other water supply lines. This type of coating can be used for flanges, fittings, sewer lines, stormwater sealing, and septic tanks. 

      Other Coating Options

      Primers

      Epoxies

      Glass