Water Lines Replaced in Rockland and Owl's Head, Maine

By Joanne Ray | September 28, 2010

The Livermore, ME-based Ted Berry Company had their work cut out for them recently when they were in charge of two projects in Maine — one in Rockland and the other in Owl's Head.

The scope of the projects was the trenchless replacement of approximately 700 feet of 2-inch to 2-1/4-inch cast iron cement lined water mains.

Project No. 1 was located on Route No. 17 in Rockland, where a 270-foot by 2-inch CI water main had to be replaced using the static pipe-bursting method.

MDOT Route No. 17 is a main road, so therefore limiting traffic disruption and restoration costs were the main goals. At the site, an excavation was performed at the upstream end — approximately 6-feet wide by 9-feet long by 6-feet deep and at a 6-inch water main. The pipeline was shut down and disconnected.

The Ted Berry Company utilized a Hammerhead HB5058 static pipe-bursting machine equipped with a 35-millimeter rod and ductile iron pipe slitters to replace the existing pipe with new HDPE.

Solid steel rods 36 inches in length are hydraulically pushed through the existing pipeline and then attached to a pipe slitter and expander head. Located behind the expander head is an adapter that connects to the new HDPE pipe, which is loaded onto a 1,000-foot coil reel trailer.

Once the tooling is connected, the rods are hydraulically pulled back towards the machine. The process fractures the existing pipe, expands the soil and pulls in a new pipe with a tracing wire attached.

At the completion of installation, the water company chlorinated the new line and made the final connections to the main.

Project No. 2 was located on Winding Way in Owl's Head, ME, which consisted of the installation of a 420-foot by 2-1/4-inch cast iron water main.

The existing water main had experienced numerous breaks over the years as it ran through a remote easement with very wet conditions. A traditional open cut replacement would have caused significant impact to the area, therefore making the static pipe-bursting method the best choice for the job.

Excavations were dug at each end of the pipeline — 420 feet apart — and water service was shut off. A 35-millimeter rod and ductile slitter was used to pull in a new 2-inch HDPE line. A reel trailer was used to make the new line one continuous segment. At the completion of installation, the water company chlorinated the new line and made the final connections to the main.