Vahit Çiftçi, Başak Akselli
UME Test Facilities for Water Flow Measurement up to 3 000 m³/h
National Metrology Institute of Turkey, UME, has completed new water flow rate measurement systems. In this article, UME primary and secondary water flow measurement systems will be described briefly. Water flow laboratory was designed for the calibration, testing, and type approval of water flow meters with the flow rates up to 3 000 m3/h and testing of the valves and pumps.
There is a 5 m × 20 m × 3 m water reservoir inside the laboratory, filled with soft water. Several stainless-steel pumps with the frequency converters exist in the system. The flow capacities are 20 to 1000 m3/h. Pumps are constructed either to feed the calibration system directly or through the constant pressure head tanks. The head tanks had capacities of 50, 15 and 5 m3 and located at the top of the tower. The height of the tower is 35 m from the laboratory floor level.
There are 5 Main test line on the water flow rate measuring system as: Large Test Line (DN -250, 400, 600), Medium Test Line (DN-200, 150, 125), Small Test Line-1 (DN-100, 80, 65,50), Small Test Line- 2 (DN-40, 32, 25, 20), Small Test Line- 3 (DN-15, 10, 5).
There are four weight-time water flow measurement systems as; 30 tons, 5 tons, 1 tone with dead weight tester and 20 kg. Estimated total expanded uncertainties of weighting systems are in 0.05 % range. There is also one volume-time flow measurement sub-system with the capacity up to 100 m3/h in the system. DN 400 and DN 250 Electromagnetic reference flow meters are located on the systems, with Capacities up to 2500 m3/h. DN 150, DN 80, DN 32 and DN 15 Turbine type flow meters with the minimum flow capacities 0.6 m3/h are also placed in the system. The uncertainties of all the reference flow meters are around 0.2 percent.
All the measuring lines, before the weighting systems were connected from one to others with the actuator valves and controlled by automation system.
There are two water-feeding pumps and tanks with the water temperature controllers, operating independently from the water reservoir that supplies hot, and cold water to the measuring line.