NASSCO Releases Guidelines On Styrenated Resins

By Jeff Griffin, Senior Editor | January 2009 Vol. 64 No. 1
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NASSCO (National Association of Sewer Service Companies) has completed a state of the art guideline for the use and handling of styrene based resins in the cured in place pipe (CIPP) rehabilitation process.

The report, based on a study by the NASSCO CIPP Committee, is titled Guideline for the Use and Handling of Styrenated Resins in Cured In Place Pipe, can be downloaded at no cost from the NASSCO web site, www.nassco.org.

Contents of the guideline includes:
• Facts about resin materials used for CIPP;
• Receiving, storing and handling of CIPP resins and initiation of chemicals;
• Transporting resin saturated tubes;
• CIPP installation practices; and
• Water and steam curing.

"Until now, there has been no document providing a well researched guideline for the proper handling and use of styrenated resigns in CIPP linings," said Ed Kampbell, a member of the committee and principal author of the guideline. "NASSCO determined that such a guideline is needed due to the increasing number of CIPP projects, the expansion of CIPP into other areas such as storm sewers, and especially with some public concern about harm to the environment."

Addressing concerns

Concern over the potential of releasing styrene into the environment related to projects using styrenated resins during CIPP applications was a primary factor considered during the eight month study by the committee.

"It is important to understand,” said Kampbell, "that styrene use related to CIPP is a much different type of environmental risk than in other resin using industries such as boat manufacturing which potentially can send large qualities of styrene into the air and their surface water discharges."

The guideline states that styrenated resin systems as they are currently used today in CIPP rehabilitation systems produce a safe and environmentally sound solution to the challenges of restoring the nation's failing infrastructure. The risk associated with styrene's use in CIPP is minimal and well within the Clean Water Act's original intent of keeping the environment as free as is practical of chemical pollutants. CIPP installation sites managed with “good housekeeping” will present little opportunity for human health risks and/or environmental risks.

The guideline sites a history of successful and safe usage of styrenated CIPP lining. In addition, it makes a strong case for styrenated resin CIPP usage.

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