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Ji <br /> Elk River <br /> Municipal Utilities <br /> 322 King Avenue phone: 763.441.2020 <br /> Elk River,MN 55330 Fax:763.441.3099 <br /> March 5, 2003 <br /> To: Elk River Municipal Utilities Commission <br /> James Tralle <br /> John Dietz <br /> Jerry Takle <br /> From: Bryan C. Adams <br /> Subject: Water Production Meters <br /> Staff has been concerned about the accuracy of the water meters at our water production <br /> facilities. The difference between water produced and water sold with even considering other <br /> losses is too great. We had these water production meters tested and the accuracy varies from 5% <br /> to 32%. The problem is the build up of manganese on the meter wall and turbine which causes <br /> the meter to run fast. Other water utilities are also experiencing this problem. Production meter <br /> inaccuracies in the 50% range are not uncommon. <br /> The solution is to replace the existing turbine meter with magnet flow or sonic type <br /> meters with teflon coated walls to minimize the build up of manganese. The most inaccurate <br /> meters are located in facilities 2,3, and 6. The estimated cost to replace these meters is $11,000. <br /> Staff recommends these meters to be replaced. Because the cost exceeds $10,000 and is a non- <br /> budgeted item, this commission must approve the expenditure. <br /> Staff is also looking at a water meter replacement program for the smaller customer <br /> meters. These meters will tend to run slower over time. The large customers meters are tested on <br /> a 3 to 5 year interval to verify accuracy. <br />