CHAPTER 3 UTILITY TRANSMISSION AND DISTRIBUTION SYSTEM


FIGURE 3.24 Various locations of customer gas shutoffs.


gas meters, including a master valve for the entire building where the gas pipe comes out of the ground. Series meters are in multi-family housing and multi-client commercial


buildings. They will have individual shutoffs as well as a master shutoff valve to close service to all the meters on the property. Large industrial meters will have various configurations due to the higher volumes of gas each company requires.


Curb Shutoff Valve


Another form of shutting off the gas to a customer is a curb valve that is in- stalled in a natural gas line servicing the building. It is usually underground in front of the building in a circular or square box in the sidewalk, or near the property line, normally with protective curb boxes or standpipes installed over or around the valve. The cover may have a nut holding it in place that will require a special box key and wrench (which emergency responders can ac- quire from the utility company) to open the cover and turn the valve to secure the gas flow to the property (using the quarter-turn clockwise).


48


FIGURE 3.25 Below-grade curb shutoff valve.

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