Flow Elements. Flowmeters shall preferably be those of the differential pressure type with an accuracy of "1 percent of the span maintained over a 10:1 flow turndown. The materials of the meters and their associated parts shall not be deteriorated by the working fluid. Flow transmitters shall have output linear with differential pressure with an accuracy of within "0.5 percent of full scale range. Flow metering primary elements and installations shall be designed in accordance with ASME "Fluid Meters" Part Two, "Application of Fluid Meters". Primary elements shall be ASME long radius flow nozzles or thin plate square edge concentric orifices as appropriate to system operating conditions and as described herein. Steam flows shall be measured with ASME long radius flow nozzles. Annubars are not acceptable. The Contractor shall be responsible for verifying that sufficient length of straight pipe is provided on each side of all primary elements. Any internal boring of adjacent pipe shall be by the Contractor. The pressure taps for flow nozzles shall be installed in the pipe well as described in "Fluid Meters" Part Two. Orifices shall be installed between specially designed orifice flanges. Where required, flow metering shall be temperature and/or pressure compensated. For flow metering of oil, positive displacement meters or area meters shall be provided. For flow metering of fuel gas to the gas turbine, an orifice plate meter run shall be provided. Condensing reservoirs shall be provided on all flow transmitter services where low differential pressures relative to the static pressure are present in steam service. Condensing reservoir inlet and outlet connections shall be a minimum of 20 mm. -------------------------------------------------------------------------------- EPC - Exhibit B -------------------- TENASKA GEORGIA GENERATION PROJECT Page 129 of 132 -------------------------------------------------------------------------------- - Nozzles - Flow nozzles shall be constructed of Type 304 stainless steel and shall be designed in accordance with Paragraphs II-III-20 through II-III-26 of the ASME report "Fluid Meters," Part Two Application of Fluid Meters - Especially Differential Pressure types. - Orifice Plates - Orifice plates shall be constructed of Type 304 or 316 stainless steel. Orifice plates shall not be less than 1/8 inch thick for nominal pipe diameters up to and including 12 inches, and shall not be less than 1/4 inch thick for nominal pipe diameters above 12 inches. Orifice plates shall be constructed in accordance with ASME/AGA standards. - Fuel Flow Meters - Individual fuel gas flow and fuel oil flow metering systems shall be provided for the gas turbine. A fuel gas check metering system shall be installed in the main gas lines. The check meter shall be installed per API standards. The metering systems shall be complete with all required transducers, including, but not necessarily limited to, the following: Flow meter Density or specific gravity transmitters Pressure transmitters Temperature elements
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Sources: Engineering, Procurement and Construction Agreement (Tenaska Georgia Partners Lp), Engineering, Procurement and Construction Agreement (Tenaska Georgia Partners Lp)