Low-Flow Sewer Pipe Infrastructure

Engineers for the City of Mishawaka’s new low-flow sewer infrastructure project are going the extra mile to protect concrete pipe, manholes and lift stations from exposure to hydrogen sulfide (H2S) gas permeation and microbiologically induced corrosion. Series 436 Perma-Shield FR, a spray-applied, high-build, fiber-reinforced epoxy liner designed to withstand severe wastewater conditions, was applied to more than a mile of sewer pipe and connecting structures in 2006.

“The specifying engineer had been shown the benefits of Perma-Shield FR over the conventional coatings that were originally considered,” according to Tnemec coating consultant Michael Land. “After reviewing Tnemec’s Severe Wastewater Analysis Test (S.W.A.T.) results along with other articles written on the effects of H2S gas, the switch to a high-performance coating system was made.”

The project was specified in Indiana and the pipe was manufactured and coated in Michigan. The Premarc Corporation in Grand Rapids fabricated the 48-inch diameter concrete pipe in 10-foot sections. Kooi Industrial Painting, Co., Grand Rapids, Mich., mechanically prepared each section by dry-abrasive blast cleaning in accordance with SSPC-SP13/NACE No. 6, ICRI CSP5, prior to coating application.

A prime coat of Series 161 Tneme-Fascure, a corrosion-resistant polyamide epoxy, was applied to the pipe, followed by a coat of Series 436 Perma-Shield FR, an abrasion-resistance, fiber-reinforced modified polyamine epoxy designed to wastewater immersion and fume environments. “Series 436 was applied with a high-pressure, airless spray pump,” Tnemec coating consultant Ken Hartwig noted.

“The applicator sprayed five feet from the center of each pipe starting at one end, then repeated the process from the opposite end to create a seamless coating barrier against severe wastewater corrosion,” said Hartwig. “The total project required more than 1,600 sections of pipe.”

Manholes and lift stations were abrasive blast cleaned in accordance with SSPCSP13/NACE No. 6, ICRI CSP5, then coated with Series 436. Prior to the Series 436 application, the manholes received a thin overlay of Series 218 MortarClad, a modified epoxy cementitious resurfacer, where needed. “An estimated 2,500 to 3,000 gallons of material were used for the total project,” Land added.

The project is part of an expansion of the Mishawaka Wastewater Treatment Plant to increase average design capacity from 12 to 20 million gallons per day for continued growth in the community and to cut annual combined sewer outflow volume in half. Work on the expansion started in 2004.

    Project Information

    Location
    Mishawaka, Indiana

    Completion
    December 2006

    Owner
    City of Mishawaka

    Engineer
    Lawson-Fisher Associates, PC

    Applicator
    Kooi Industrial Painting Co. Grand Rapids, Michigan

    Printer Friendly Version

    PP_Low-Flow_Sewer_Profile

    Contact Your Rep

    Looking for Some Local Coatings Guidance?

    Reach out to one of our knowledgable and reliable representatives near you.

    How to Purchase

    Ready to Order Tnemec?

    We're ready to help. Click below to learn more about our purchasing process.

    Color Requests

    Searching for the Right Color?

    Use our color tool or request more tools from your local representative.

    Continue Exploring in the color tool

    Close

    Color Swatch packet

    You can use our Color Tool page to explore our available colors and request swatches of colors you like.

    Sorry, there is a maximum of 6 color swatches.

    Request swatch packet

    Continue Exploring in the color tool

    Close