Restrained Joint PVC Allows Obstacles To Be Overcome In Sewer Extension Project

October 2009 Vol. 64 No. 10
RPM Construction used CertaFlo Greenline 8 inch SDR21 restrained joint PVC in a recent 11,000 foot sewer extension in Hobbs, NM.

As domestic oil production increases throughout the United States, so have the populations of western oil towns, such as Hobbs, NM, as hundreds of new people flock in to find work on the oil rigs.

This kind of growth has led to significant municipal water and sewer line extensions and improvements in the towns to serve the expanding population.

Last year, the city of Hobbs annexed 1,000 acres at the juncture of Dal Paso Street and Navajo Drive, two of its arterial roadways, for residential and retail development on the north side of town. The annexation was part of the city’s Dal Paso Navajo Corridor Strategic Growth Plan, which also included a sewer main extension of nearly 11,000 feet, and the installation of 51 sewer connections and 34 manholes. The new system was designed to tie in existing homes and businesses that previously had septic tanks and provide service for future development.

The city hired RPM Construction LLC, of Hobbs, for the massive infrastructure project in March 2008. The contractor was given the choice of what pipe materials to use on the project and method of installation. For the sewer main extension, they chose CertainTeed 8-inch SDR21 restrained joint PVC pipe, with installation by horizontal directional drilling. Using restrained joint PVC pipe in conjunction with directional drilling often provides an easier, faster installation, with fewer disturbances to the surrounding area.

“Directional boring typically helps the customer save money, since you’re not cutting up driveways or pavement as you would with an open cut installation,” says Robert Mendoza, owner of RPM Construction. “You don’t have to close off roads and driveways or restore the area after the project is finished. The restrained joint PVC pipe is durable and easy to install. It only takes two or three workers to put the pipe together during pullback. Plus, you don’t have to purchase or rent a fusing machine and spend extra time on joint fusion and cooling.”

CertainTeed’s innovative Certa Lok restrained joint technology requires no special heat fusion equipment, saving contractors a significant amount of time and money. PVC pipe joints are assembled during pullback, so streets remain open and clear, and the pipe is available in shorter 10 foot lengths to simplify assembly in the often confined spaces of directional bored sewer and pipe bursting jobs. When compared to alternate thermoplastic materials, higher strength PVC also requires a much thinner wall in order to achieve the same pressure rating.