![]() The water meters had a rated diameter of 20 mm, class C, Q min=0.025 m 3/h, each 1 to 7 years old. Operation of 33 water meters with UFR was tested in a calibration laboratory in Udine (Italy). The papers published so far refer to measurements obtained on individual water meters and on segments of pipelines. from Jerusalem is used for adjusting water volume measuring at flow rates lower than 0.026 m 3/h. Due to water losses through pipeline leakage, the difference in pressure exceeds the limit value, hence the UFR opens, providing flow at a rate of at least Q min which is then registered by the water meter. For pressure lower than the declared, the UFR closes flow through the water meter, since the spring force is stronger than the force generated by the difference in upstream and downstream pressure. UFR operates based on the difference between the upstream and downstream pressure of 0,4 bar at the valve. As a solution to this problem, the installation of impulse valve, unmeasured-flow reducer, known as UFR, at the water meter is recommended since 2007. Therefore, water volume is measured unreliably due to leakage at the tap, with a flow of 0.003-0.007 m 3/h (drop by drop) and 0.010-0.016 m 3/h (jet), at the bathroom tap at 0.010-0.014 m 3/h (in a very thin jet), and at the toilet tank at 0.004-0.025 m 3/h. For a 20 mm rated diameter water meter, used in the households of this country, the minimum flow is about Q min=0.016-0.060 m 3/hour. Use the checklists in the Outdoor Visual Leak Inspection ( Section 2) and Indoor Visual Leak Inspection ( Section 3) to conduct visual leak inspections around your home.In line with the Measurement Protocol for Water Meters in the Republic of Serbia, a water meter is declared unreliable for water volume measuring at flow rates lower than Q min. Visual Inspection MethodĬonduct the Visual Inspection Method if you did not detect a continuous leak when you performed the Leak Detection Test ( Section 1) or if you are uncomfortable with the Isolation Method. If you are comfortable turning valves on and off, go to Isolation Method for Continuous Leaks ( Section 4). You will turn water supply valves "off" to prevent water from flowing into water supply pipes. This is often the quickest way to locate ongoing, hard-to-find leaks. If your Leak Detection Test ( Section 1) indicated a continuous leak, consider using the Isolation Method to discover the leak location. The purpose of the Isolation Method is to isolate different sections of the plumbing in and around your home. A brief description of both methods follows. This guide provides two methods to detect the location of leaks: the Isolation Method and the Visual Inspection Method. To determine if you have a slow leak follow Step 3 above. ![]()
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