A transmission line is kind of like a super highway for moving massive amounts of gas across great distances. The proposed transmission line through Hamilton County will either be supplied by similar transmission lines originating in the south, or transmission lines from the Utica and Marcellus shales.
The lines in your neighborhood are service lines, not transmission lines. While size varies, service lines typically range from ½ – 2 inches in diameter. The pressure in the service line when it reaches your house is less than 1 PSI. Duke’s proposed 30 inch transmission pipe is a high pressure line containing 720 PSI in a single 1 inch cube. But the real measure of the pressure in the pipeline is what is called total force…that equals 507,000 psi’s and a major explosion if the pipeline were to fail and ignite.