Pipelines & Transmission Mains*

We have installed more than 140 miles of pressure pipe, from 12-inch distribution mains to 96-inch transmission lines. Our pipeline crews work in the places that make pipe difficult: dense urban streets, steep slopes, wetlands, railroad and highway crossings, and rivers.

Open-cut construction

Most of our work is open-cut installation of ductile iron (DIP), welded steel, PCCP and fusion-welded HDPE. Our crews place bedding to AWWA C600 and C603, assemble restrained joints and thrust restraint, perform welding and coating repair and complete hydrostatic testing before backfill is final. Trench safety is managed by competent persons on every crew, with shoring designed by engineers for deep or unstable trenches.

Trenchless and crossings

We use horizontal directional drilling (HDD), jack-and-bore, microtunneling and pipe ramming to cross highways, railroads, streams and sensitive habitat. A pit-and-shaft design is prepared with a geotechnical engineer and reviewed with the owner and permitting agency, including fluid management for HDD operations.

For long mains we manage utility conflicts proactively. Our in-house surveyors verify alignments, potholing is completed ahead of the pipe crews, and tie-ins to live mains are planned in coordination with the utility's operations staff to keep customers in service.