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Excess Flow Valves

All single residence customers whose request for natural gas service requires the installation of a new or replacement service line will have an excess flow valve in the new or replacement service line at no cost to the customer.

An excess flow valve is a device designed to shut off the flow of natural gas automatically in the event the gas service line is broken.

Middle Tennessee Natural Gas is required to inform our customers that excess flow valves meeting minimum United States Department of Transportation standards are available and that if you, the customer, are willing to pay the cost associated with installation, maintenance and replacement of the valve, Middle Tennessee Natural Gas will have an excess flow valve installed in the existing natural gas service line to you. It is not mandatory to have an excess flow valve installed in existing service lines.

If you are interested in having an excess flow valve installed in your existing natural gas service line, please contact us for current cost information. Price quotes for the installation, maintenance and future replacement of the valve will be provided at the time the request is made.

Customer Owned Lines

Safety is Everyone’s Responsibility:

Federal Regulation 192.16 requires that we notify you to exercise diligence regarding underground or buried gas piping. Buried pipe may be subject to leakage and/or corrosion (corrosion may occur on metallic pipe) and could potentially be subject to hazards if not maintained.

Buried gas piping should be:

  • Periodically inspected for leaks;
  • Periodically inspected for corrosion if the piping is metallic;
  • Repaired if any unsafe condition is discovered, or the flow of gas should be shut off;
  • Located and marked in advance when excavation is performed or is about to be performed near the buried gas piping;
  • Excavated by hand when work is performed near the pipe.

Our Part

Middle Tennessee Natural Gas owns, operates and maintains the Natural Gas distribution pipeline in our District, up to and including the Natural Gas meter. We do not own, operate or maintain gas piping downstream of the meter, though we are available to assist customers with their fuel line needs. We are required to notify you of the lines that belong to you, and your responsibilities under Federal Regulation 192.16.

Your Part

Any and all gas pipe downstream of the Natural Gas meter (the "building" side) belongs to you, the gas customer. It is the gas customer who is responsible for maintenance and operation of this portion of the fuel line system. We do not own the gas beyond the meter; therefore, we do not maintain or locate fuel lines. Commercial plumbers and/or heating contractors, including our own Customer Service Department, may be contacted when gas fuel lines need attention.

If you have any questions or comments, please feel free to contact us.

Pipeline Safety

Whether you are building an addition, laying a patio, planting a garden, or just digging a post hole for a mailbox, Don't Dig Though the Natural Gas Service Line. Should you plan to do any digging, please contact TENNESSEE ONE CALL - THE STATEWIDE NOTIFICATION SERVICE by calling 811 at least three days in advance so that all Middle Tennessee Natural Gas owned buried pipe may be located and marked for you at no charge.

All digging in the vicinity of piping should be carefully done by hand. This will avoid the inconvenience of disrupted service, personal injury and expensive repairs.

Violation of the "Call before you Dig" Act is a Class A misdemeanor and subject to a fine up to $2,500 and/or imprisonment for 48 hours.

If a gas main or service line is exposed during digging, call Middle Tennessee Natural Gas. Proper attention to pipe that has been exposed will prevent problems later.

Natural Gas Facts

The properties of Natural Gas actually combine to make it the safe, clean and environmentally friendly energy choice for the 21st Century.

Natural Gas is…

  • A naturally occurring mixture of several light hydrocarbons and other gases. The primary ingredient in Natural Gas is methane, composed of one part carbon and four parts hydrogen (CH4).
  • Lighter than air and non-corrosive.
  • Odorless and colorless in its natural state. So, for safety reasons, an odor that smells like rotten eggs is added to Natural Gas so that you can smell it, allowing leaks to be located and repaired.
  • Gaseous at any temperature over -260 degrees Fahrenheit.
  • Non-toxic and contains no poisonous ingredients, though in large quantities in enclosed spaces it can displace oxygen.
  • Clean burning: methane burns easily and leaves few pollutants. When natural gas is burned properly, by-products of combustion are primarily carbon dioxide and water vapor. Because methane contains only one carbon atom, natural gas produces less carbon dioxide than any other fossil fuel, and fewer other pollutants as well.
  • Safer to handle than most fuels. Natural Gas by itself will not burn. Combustion can occur only when there is a proper mixture of gas and air; a flammability range comprised of approximately 5 to 15 percent natural gas, and between 95 to 85 percent air. Even with the proper mixture it requires a high ignition temperature of approximately 1,100 degrees Fahrenheit.
  • A strong greenhouse gas, so burning it and producing carbon dioxide is actually preferable to allowing it to release into the atmosphere.

All of these factors combine to help make Natural Gas the safest energy source available. Understanding and following proper safety practices help make it even safer.

Carbon Monoxide

Carbon monoxide can result from the incomplete combustion of any fossil fuel. Natural gas appliances are designed and installed in a manner to eliminate this concern, if operated properly. As with all energy, careful diligence must be exercised with natural gas. Appliances must be properly operated and maintained to insure your safety. The information on carbon monoxide below is adapted from the Centers for Disease Control and Prevention website; for additional information visit

Appliance Safety

Natural gas appliances should always be:
…installed by properly trained and qualified personnel.
…installed in accordance with installation instructions and applicable building codes.
…converted from propane use only by qualified personnel according to instructions.
…operated and maintained according to manufacturer’s instructions.
…inspected regularly to insure proper operation.

MTNG will gladly perform a safety inspection or “light-up” of a newly installed appliance, and will repeat inspection annually upon request at no charge.

Appliance safety points to consider between inspections include the following: clearances, filters, flammables, unvented heaters, vents & ducts, water heater reliefs, and water temperature.

When selecting a natural gas appliance, please remember that there are special considerations for installations in bathrooms, bedrooms, garages, and more. Please contact us if you have questions or concerns. Our trained professionals are always happy to make recommendations that could help prevent any potential problems.

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