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distribution . The Con Edison System . For more than 180 years, Con Edison has served the world'smost dynamic and demanding marketplace - metropolitan New York while maintaining a safe and reliable natural gas supply to more than 1.1 million gas ACOUSTIC VELOCITY FOR NATURAL GAS Introduction Acoustic velocity data for natural gas is useful for determining liquid levels in oil or gas wells and locating obstructions in gas lines. Application of Data Generally the distance to the liquid level in an oil well is determined by generating a pressure wave in the casing annulus gas at the surface.