rehab

Gerhard “Gerry” P. Muenchmeyer, P.E., NASSCO Technical Director

The design of manhole coating and lining systems must take into consideration a number of conditions in the manhole, both as a whole and as individual components. When evaluating the nature of the coating or lining that will work best, a number of conditions should be defined.

The Texas Water Development Board (TWDB) has approved a $49.9 million loan from the Clean Water State Revolving Fund to the city of Houston (Harris County) to finance wastewater system improvements.

In June 2011, American Airlines’ Tulsa Engineering Facility personnel discovered a severe leak in their fire suppression system following a recent activation. The section of damaged pipeline was approximately 70 feet long and was situated 8 feet below a power substation, and encompassed one 10-inch tee. Dig and replace was not a viable option.

By NASSCO member Ed Kampbell, PE, Jason Consultants

There are four key elements to having a really good Cured-in-Place Pipe (CIPP) installation:
1. Proper saturation of the tube;
2. Proper inflation of the resin saturated tube in the host pipe;
3. A full and thorough curing of the resin system used; and
4. A proper cool-down of the CIPP.

Gerhard “Gerry” P. Muenchmeyer, P.E., NASSCO Technical Director

Manholes consist of multiple components and are made of different materials, each serving a different purpose but contributing to the complete manhole structure. Each component typically has its own set of defects and deterioration mechanisms.

Moody's Investors Service, one of the world’s leading credit rating agencies, affirmed in July Atlanta, GA’s A1 rating on the city’s $3.2 billion water and wastewater revenue bonds.

The Jersey City, NJ, Municipal Utilities Authority (JCMUA) will spend more than $52 million on sewer repairs and upgrades and pay a civil penalty of $375,000 after repeated violations of the Clean Water Act, according to a settlement with the federal government.

RS Technik has entered a licensing agreement with Inland Pipe Rehabilitation (IPR) for its new RS BlueLine pipe rehabilitation system featuring specially formulated Dow epoxy resins for pressure pipe applications.

In an effort to avoid filing the largest municipal bankruptcy in U.S. history, officials in Alabama’s Jefferson County extended until mid-September talks with creditors holding $3.14 billion in debt incurred after officials borrowed money to fix their troubled sewer system and then entered into a number of complicated and corruption-laced refinancing deals that backfired in 2007 with the mortgage lending crisis. Those schemes also resulted in the conviction of a number of local officials and businessmen.

The city of Los Angeles, CA, recently completed 1 million feet of sewer that has been constructed or rehabilitated using trenchless technologies.

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