This article describes fundamental design, technical aspects, measurement and internal calibration principals of weighing-time flow measurement systems with the diverters for water and Hydrocarbon liquids, which are newly established at UME Fluid Mechanics Laboratories.
At the UME Fluid Mechanics Laboratories, there are four weighing-time flow measurement systems with the capacities of 30 tons, 5 tons, 1 tone with dead weight tester and 10 kg for water and three weighing-time flow measurement systems with the capacities of 2.5 tons, 1000 kg with dead weight tester and 150 kg for Hydrocarbon liquids. There are five diverters on the weighing-time flow measurement systems with the diameters of 600, 400, 200, 100 and 15 mm for water and three diverters on the weighing-time flow measurement systems with the diameters of 300, 100 and 50 mm for Hydrocarbon liquids.

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.

National Metrology Institute of Turkey, UME, has completed the new oil flow rate measurement systems. In this article, UME primary and secondary oil flow measurement systems will be described briefly. Oil flow laboratory was designed for the calibration, testing, and type approval of liquids other than water. It utilizes flow meters with the flow rates up to 300 m3/h and capable of testing of valves and pumps.
There are two 1 m3 and one 4 m3 oil reservoirs in the laboratory for different flow rate measurements with various type of oil. Three stainless steel pumps with the frequency converters can supply flow rates from 0 up to 300 m3/h. Pumps have capability of supplying required flow to calibration system directly or send oil to tower head tanks, which are located on the top of the tower, with capacities of 4, 2 and 1 m3. This system aims to decrease system measurements error due to pressure pulses created the tower is about 35 m from the laboratory floor level. Oil can be heated up to 80 °C by using heat exchangers.
There is three test lines on the oil flow rate measuring system as: Large Test Line (DN 300), Medium Test Line (DN 100) and Small Test Line (DN 50).
There are three weighting-time oil flow measurement systems and one of them has dead weight tester with 2.5 tons, 1 ton and 150 kg. DN 300, DN 100 and DN 50 ultrasonic type reference flow meters with the maximum capacities 250 m3/h are also placed on the systems. The uncertainties of all the reference flow meters are about 0.2 percent.
All the measuring lines were connected from one to others with the actuator valves and controlled by automation system.
There are two oil drainage system transfer pumps and packaged type oil separator with the level controllers. This system is used to clean the oil flow measurement systems.
Feeding, and controlling of the oil flow to the measuring lines and testing of the flow meters are being performed by the automation systems.

Principle, work procedure, structural features, function, test procedure and analysis of uncertainty for gas piston are introduced, the data compared with PVTt facility are given. According to the specifications, it is found that the establishment of the device is successful and some experiences for further work are accumulated.

We compared 20 m3 and 2 m3 facilities of pVTt methods gas flow primary prover (pVTt prover) in Flow lab of National Institute of Metrology of China (NIM). We used sonic critical venturi nozzle (sonic nozzle) as transfer standard. The flow points of comparison are about 100 nm3/h and 150 nm3/h. We completed four comparison tests whose results are considered acceptable, whereas we found there was a little systematic error between the two facilities.