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CHAPTER 3 UTILITY TRANSMISSION AND DISTRIBUTION SYSTEM OBJECTIVES


At the completion of this chapter the student will be able to: • Explain the difference between – Transmission pipelines – Distribution pipelines


• Explain the purpose and operation of a pressure regulator. • Explain the purpose and operation of a pressure relief device.


• Describe the shutoff method for closing a residential or small commercial service.


• Identify three markings on a gas pipeline. • Describe the differences between a main valve and a curb valve. • List two safety precautions when shutting any gas valve.


OVERVIEW


Responders must have a clear understanding of the transmission, distribution and equipment involved in moving natural gas from the well to the customer. This chapter will look at the equipment involved such as pipes, compressors, regula- tors, valves, meters, and shutoffs.


Chapter One defines the


four general segments of the natural gas industry:


• Processing • Transmission • Distribution


Each of these processes has unique responsibilities and equipment to per-


form its task of delivering the gas to the customer regardless of where each is in the “stream” of natural gas. For example, some equipment unique to


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FIGURE 3.1 Components of a natural gas delivery system.


• Gathering—Explo- ration and Production (E&P)

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