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CHAPTER 3 <br />PIPELINES AND PlPELINE TERMINALS <br />Northem States Power Company (NSP) <br />NSP owns and operates two odorized natural gas pipeline systems in Roseville. One <br />system is their transmission system, the other their distribution system. <br />The transmission system consists of 20 inch, 16 inct�, 10 inch and a small amount of 6 <br />inch pipe. This pipe is installed �n the boulevards of Rice Street, County Road "B" ana <br />aiang Hamline Avenue as shown in Figure 9. During the summer of 1994, NSP <br />refocated and insialled new 10 inch pipe between County Road 'B-2' and County Road <br />'C' as part of Ramsey County's road reconstruction prog�am in that area_ The system <br />operates at a pressure of 175 pounds per square inch gage {psig). The steel pipe is <br />coated and cathodically protected. {Additional technical information about this pipeline <br />system is contained in the Fact Sheets of Chapter 4). <br />To maintain an adequate supply of natural gas during high demand periods, a 20 inch <br />pipelir�e from NSP's Lake Efmo system joins the Rice Street pipeline at Rice Street and <br />County Road B as shown in Figure 17. The pipelines, valves and pressure regulators <br />at this location are enclosed in a residential bungalow type house so as to blend in with <br />neighboring properties. The equipment is electrically operated by remote control from <br />NSP's St. Paul Dispatch Center. , <br />Automatic pressure regulators, located throughout #he City, control and reduce the <br />press�re #o the distribution system. Pressure regulators are also equipped with <br />pressure relief vaives. <br />Line markers, Figure 5, appear ir�termittently on utility poles and on formed steel posts. <br />The naturai gas distribution system, Figure 10, consists of steel and plastic pipe <br />ranging in size from 1/2 inch to 8 inch_ The pipe is installed in ihe boulevards of <br />vi�tua�iy every Roseville street. The system operates at pressures ranging from nnro <br />psig to 60 psig, and provides natural gas to afl NSP customers in the community. <br />Original pipe in this system is steef; plastic pipe is used in new installations and where <br />repiacement is needed. <br />Pressure reguEators maintain a uniform pressure a# user locations as well as to reduce <br />system pressure. Pressure relief valves are an integral part of this system. (For <br />additionai information about the distribution system refer to the Fact Sheets of Chapter <br />4). <br />3-1 <br />