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Missouri Rock, Ozark Mountains Big Challenge To Gas Line Installation
At the same time the transmission line project was under way, Summit was installing the gas distribution system to bring natural gas service to homes and businesses in the city of Branson. The system includes installation of 60 miles of HDPE pipe in diameters of 6, 4, and 2 inches. Subsurface conditions in Branson also are rocky.
“Almost of the pipe in the city is being installed by horizontal directional drilling,” said Brown. “The right of way is so narrow, there already are many buried utilities, traffic is heavy, and much of the area where pipe goes is landscaped. There really is no other way to do the job.”
Average length of bores for the mains is from 450 to 500 feet at an average depth of 36 inches. Residential services are 3/4-inch in diameter and are installed 24 inches deep. Lengths vary with each home. Commercial service lines are two-inches in diameter to provide needed capacity, and some are as long as 1,000 feet. Commercial services are 36-inches deep.
Included in the 13 HDD units working in Branson are Ditch Witch JT3020 and JT4020 All Terrain models.
“The capabilities of these machines has proved to be an important factor in completing this project,” said Brown. “Going into the job we projected each drill unit could average 300 feet per day. We are averaging 700 feet per day with these machines.”
Although relatively compact in size, the JT3020 AT develops 30,000 pounds of thrust, 4,000 foot pounds of torque, and spindle speeds to 225 rpm.
The mechanical dual-pipe system delivers maximum downhole horsepower and operates on low volumes of drilling fluid. The AT design employs an inner rod to drive a rock bit, and the outer pipe steers the downhole tool for drilling pilot holes and provides rotary torque for the hole opener during backreaming. In addition to rock drilling, All Terrain models are productive in almost all types of soils.
Also they used a Ditch Witch FX30 vacuum excavation system which is typically used for potholing and clean up of work sites. It is equipped with an 800-gallon spoil tank.
Summit Utilities Management Services specializes in constructing natural gas distribution systems to provide natural gas to residential and commercial customers.
Southern Missouri Natural Gas, Mountain Grove, MO, owns and operates over 400 miles of natural gas pipelines and is expanding its system to serve the communities of Houston, Branson, Hollister, Mountain Grove, Lebanon, West Plains and others.