April 2011 Vol. 238 No. 4


Utility Saves By Using Keyhole Technology

Washington Gas is in the midst of a major project to rehabilitate about 143,000 gas service lines and 1,900 miles of gas mains. Specifically, the utility is renewing the steel service lines by inserting plastic pipe into them, and it is encapsulating – or renewing the life of – the mechanical fittings that join the mostly 40-foot lengths of wrapped steel distribution main to prevent leaks on the couplings. “Unlike the couplings, the wrapped steel pipe is in really good condition and does not need to be replaced,” says Katie Harkless, Washington Gas project manager – replacement. Keyhole technology has lowered the cost and improved the efficiency o

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