Three tests were made on a system with 26 households on Malta. The water volume measured with UFR was higher for 19.58-9.66=9.92%. With the usage of UFR, the measured water volume was higher for 16.0-6.1=9.9% (on the system with 120 water meters) and for 26.0-18.8=7.2% (on the system with 360 water meters).įrom October through December 2006, a water supply system with 280, class B and C water meters, age over 1-15 years was tested in Larnaca with weekly balancing. The used class B water meters were with the following characteristics: Q a=0.012 m 3/h, Q min=0.050 m 3/h and nominal flow Q n=2.5 m 3/h. Testing was also implemented in Jerusalem from March 2005 in a duration of 14 months (8 months without UFR and 6 months with UFR) on two systems, where the first comprised 120 and the second 360 water meters. By comparing the results of the balancing obtained for the mentioned statuses, the contribution of UFR to measuring water volume by water meter was determined. Each testing has been carried out with two water balancing: one with and another without UFR in operation. Tests were made on parts of the water distribution pipeline in Jerusalem, Larnaca (Cyprus), on Malta, in Kingston (Tennessee, USA) and in Palermo (Italy). from Jerusalem (Israel) 1 - flow direction, 2 - UFR plug, 3 - UFR spring. Structure of the UFR- manufactured by A.R.I. Due to the characteristics of water meters installed in the Republic of Serbia, a similar research is necessary for water meters with 0.025 m 3/h
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