TTC releases CIPP study results

The Trenchless Technology Center (TTC) has published the results of a study assessing the environmental impact of steam cured-in-place pipe (CIPP).

Established more than 25 years ago and operating from the Louisiana Tech University in the US, the TTC promotes research, development and technology transfer within the trenchless industry.

Its latest findings were based on an extensive study undertaken to evaluate the air emissions from steam CIPP installations taking place under various climate conditions and determine the extent of its impact on both workers and the environment.

TTC found styrene levels inside the transport truck and near the emission stack could potentially pose health risks to workers if they were exposed for more than 5 minutes; however, levels taken at 3 m or more away were far below guideline levels.

Levels taken at homes near exhaust points also resulted in minimal levels, suggesting styrene emissions were unlikely to rise to dangerous levels in urban dwellings surrounding worksites.

Following the results of the study, TTC recommended air quality be monitored in the transport truck or storage unit and suitable PPE should be worn by those immediately entering these locations.

Additionally, TTC recommended a perimeter of approximately 4.5 m be implemented around exhaust manholes and emission stacks during curing, which should not be breached without PPE for more than five minutes.

The study was funded by the National Association of Sewer Service Companies (NASSCO).

For more information visit the TTC website.

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