Case Studies

Project Type
PARALLEL NATURAL GAS LINES
Location
CAPAY, CALIFORNIA (USA)
Length / Hole Diameter
Two 780 m (2,560 ft) crossings / 914 mm and 1067 mm (36 inch and 42 inch) SAWL steel pipe
Divisions
The HDD Company

CACHE CREEK GAS LINE

SIDE-BY-SIDE HDD INSTALLATION

Project Summary

Environmental standards have changed dramatically over the years. In 1960, a natural gas line was permitted to be installed along the bed of Cache Creek near the town of Capay (an hour west of Sacramento). In 1991, a larger parallel line was placed at the same location. When the owner applied to replace both lines in 2014, the new 914 mm and 1067 mm (36 inch and 42 inch) lines were required to be installed at a safe depth safely below the water crossing. The HDD Company was subcontracted to complete the drilling.

The plan called for both lines to be installed parallel to one another at a depth of 80 feet below the creek bed.

Key Challenges

This project involved tight timelines. The initial plan called for one HDD rig working in 24-hour shifts. After assessing the sites entry and exit points, the HDD company provided an alternative suggestion: to bring two HDD rigs onsite (located 70 feet apart) and complete both crossings simultaneously. It was felt the entry point was more than sufficient for both rigs and all support equipment, while the exit point allowed ample room for materials, the welding crew and pipe stringers.

Both pilot holes were completed in little over two weeks, then reamed to the required size. The larger pipe emerged 1.2 feet from the designated exit point, while the smaller pipe emerged 44 feet from the expected exit.

Clear communication, a collaborative planning process and solid execution ensured this important pipeline was back online in little over four months from the start of construction.

Services Provided

HORIZONTAL DIRECTIONAL DRILLING (HDD)