Multiple Meters


Large buildings with multiple occupants, such as an apartment or commercial complex, may have more than one meter in the structure. These meters will typically be found as a bank of meters and may be in multiple locations de- pending on the size and layout of the structure. If natural gas flow to a specific apartment or unit must be isolated, the gas meter for that unit must be shut off. If it is necessary to isolate the natural gas flow for the entire complex, emergency responders should shut off the gas at the master shutoff valve.


Industrial Meters


Large meter installations of various configurations are used for high volume industrial and commercial customers. These meters are normally located next to the structure but may also be housed in a separate meter shed. Multi-struc- ture complexes may also be supplied through a single, large meter, such as at a power house.


Earthquake Shut-Off Valves


In regions prone to earthquakes, many gas customers have installed earth- quake shut off valves on their gas meters. These are typically located on the customer side of the gas meter. In the event of an earthquake, these valves will block off the flow of gas before it enters the building. If an earthquake shut off valve is actuated, only authorized gas utility personnel should reset it back to its original position, as the gas lines must be pressure tested or sur- veyed for leaks prior to natural gas service being restored to the building.


Curb Valves


In addition to shutoff valves at a meter, commercial occupancies and urban areas may have curb valves that can be used to isolate and control flow to a specific building or several related structures. A curb valve is located in a cir- cular or square box in the sidewalk, near the street or in a parking strip, and is protected by a secured cover. The cover is usually secured by a five-sided locking nut, and will require a special box key and wrench in order to open. A long-handled “valve key” is then used to turn the curb valve one-quarter turn and shut off the flow. Emergency responders should consult with the local gas utility company to determine local procedures for fire department use of curb valves.


Main Valves


Main valves are found in the street or major intersections and are used to isolate and control larger areas of a natural gas distribution system. Main valves usually do not have a locking nut and are unsecured; however, a spe- cial wrench is required in order to close the valve. Emergency responders should never attempt to shut down a main valve on the distribution system unless specifically directed by natural gas utility personnel. Closing a main valve may shutoff essential service elsewhere within the system.


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