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<br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />- <br />. <br />. <br />. <br />. <br />. <br />. <br />I- <br />. <br /> <br />Residential Secondary Water Meters - Research Proiect <br /> <br />. 6-ft X 8-ft X SOO-ft concrete flume <br />. S-ft X 6-ft X SO-ft wood/plexiglas sectional model flume <br />. 4-ft x 4-ft x 80-ft wooden high velocity erosion control flume <br />. Tilting 3-ft x 4-ft x 24-ft steel/plexiglas research flume <br />. Tilting 2-ft x 3-ft x 24-ft steel/plexiglas research flume <br /> <br />The hydraulics laboratory at the Utah Water Research Laboratory will be used primarily to <br />obtain a baseline for meters that will be tested in the field. Meter accuracy under clean water <br />laboratory conditions will be compared to meter accuracy and performance under dirty water <br />conditions in the laboratory and in the field. Much of the specific details for these tests will be <br />generated after the literature review, market analysis and the survey; therefore, the following is <br />a preliminary test plan for these tests in a brief summary form. <br /> <br />8.2.1 Clean Water "Baseline" Testing <br /> <br />Accuracy Comparison Tests - Several meters (selected during earlier tasks) will be tested for <br />accuracy using clean water. These tests will be performed under idea11aboratory conditions to <br />provide a baseline for all other tests performed on each specific meter. With results from the <br />clean water baseline test series, researchers will be able to see changes in meter accuracy and <br />performance due to dirty water conditions. A wide range of flow rates will be tested and <br />measured with NlST traceable flow measurement equipment and compared to the indicated <br />flows from the meter. <br /> <br />Transient Tests (water hammer) - Several meters (selected during earlier tasks) will be tested <br />under cyclic transient conditions. The sudden opening and closing of automatic solenoid valves <br />in residential secondary water systems can create transients and pressure fluctuations. Some <br />flow meters, which contain mechanical components are susceptible to wear and malfunction if <br />exposed to transient pressure conditions. These tests will look at the durability of several <br />selected flow meters when installed in systems that have regular transient pressure waves. A <br />repeated transient will be induced in the laboratory test line, so that the flow meter experiences <br />the full pressure change over 100, 500 or even 1000 pressure cycles. Following the cyclic <br />transient test, the meter will again be tested for accuracy to determine whether or not its <br />accuracy from the clean water baseline tests has changed. <br /> <br />8.2.2 Dirty Water Testing <br /> <br />Particulate Testing - Several meters (selected during earlier tasks) will be tested under dirty <br />water conditions. A test loop in the laboratory will be constructed such that varying levels of <br />sediment can be introduced. The water in the test loop will be recycled through a pump for <br />these tests as opposed to the clean water tests where the water will be wasted and a continuous <br />supply of clean water will be supplied. It is proposed that three levels of TSS be placed in the <br />test loop to determine the affect of dirty water on meter accuracy. Specific desired TSS levels <br />will not be possible, yet it will be possible to "load" the test loop and then measure the level of <br />TSS in the water. The first test will contain the lightest loading of sediment. Each test thereafter <br />will contain a higher sediment load. During the test, the flow rate will be measured with an <br /> <br />17 <br /> <br />. <br />r <br />