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<br />The equipment treating the remaining 50 million gallons per day is also the <br />same general configuration. The pressure vessels are 12 inches in diameter <br />and 20 feet long-the largest in the industry. Control block capacity for this <br />equipment is 1.1 million gallons per day. The 1.1-million-gallons-per-day <br />control block is made up of 24 pressure vessels, each containing four <br />membrane elements. The 45 control blocks contain a total of 4,320 elements. <br /> <br />Feedwater to the desalting units is pressurized to approximately 400 pounds <br />per square inch by 11 high-head vertical turbine pumps that discharge into <br />two headers. One is for the 8-inch units, and the other is for the 12-inch units. <br /> <br />Plant Features <br />Product water is collected from each stage individually and combined with <br />untreated drainage water in a concrete channel and conveyed to the Colorado <br />River. The reverse osmosis reject flows to an energy recovery system, with <br />hydraulic pelton wheels directly coupled to three high-pressure feed pumps <br />and motors. (This system will save approximately 14 million kilowatt hours <br />per year-approximately 8 percent of the total energy load.) From there the <br />reject is piped to the bypass drain where it is combined with excess untreated <br />Well ton-Mohawk drainage and then flows to the Santa Clara Slough in <br />Mexico at the Gulf of California. <br /> <br />In addition to reducing cnergy requirements, the energy recovery system <br />acts as an excellent pressure reducer for the reject stream. Multiport sleeve <br />valves will be utilized to dissipate energy in the reject flow when a pelton <br />wheel is out of service. <br /> <br />Office and control room areas are located in the two-story section of the <br />desalting building. The computer control system is provided special areas <br />for electronic and computer equipment, as well as the control room and <br />associated operator areas. <br /> <br />A subject of special concern is the no-load condition which is expected to <br />result from high riverflow conditions. Current hydrology indicates the plant <br />may be shut down for 4 in every 10 years, In these instances it is expected <br />that the plant would be shut down for the entire year. The membranes will <br />be cooled wich chilled chlorinated water during the outage. <br /> <br />Test Train <br /> <br />A small but important feature of the plant is the Test Train. This test system <br />affords potential for advancements in both pretreatment and desalting tech- <br />nology, plus the ability to maintain a program of continuous technology <br />assessment for operations and equipment replacement. The test train will also <br />provide a vehicle for operator training, <br /> <br />4 <br />