Defining, Understanding Lateral Rehab Options

Part 2 in a series
By Jeff Griffin, Senior Editor | May 2011, Vol. 66 No. 5

Ambient curing under air pressure is a common curing method because it requires less equipment. Ambient cure time typically ranges from 1 to 12 hours, depending on the resin system and length of the liner.

Steam curing proves to be the most productive since the contractor has plenty of work-time which is especially important when long liners are installed and curing is complete in as little as 30 minutes once the liner has been inverted in place. Also resin that is steam cured achieves a high level of cross-linking resulting in higher physical properties.

Ultraviolet light curing is used with some technologies and offers the shortest cure-times, as fast as 10-minutes for short liners that extend about eight inches into the lateral pipe.

Hot water curing is used to line a lateral from an access point toward the main, but is not typically used to make main/lateral connection repairs due to the lateral liner inverting from within the main pipe

Educational benefits cited
The report includes detailed positive and negative attributes of each method. “There is an enormous amount of information that needs to be discussed and put into booklet form that is easy to understand and will provide significant education on the benefits of trenchless lateral repairs,” said Committee Chairperson Kiest. “The document will assist NASSCO in working with local and state governing health and plumbing boards through education to encourage these agencies to accept these technologies into the code books.”

After the document is finalized, NASSCO will make it available to association members and the public.

Kiest is president and chief executive officer of LMK Enterprises, Ottawa, IL.

NASSCO is a national organization comprised of several hundred members representing rehabilitation industry manufacturers and suppliers, municipalities and utility districts, engineers and contracting firms. Ted DeBoda is executive director.

NASSCO, (410) 486-3500,

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