Water Flow Meter

Listing ID #3693433

The water Flow laboratory works on the gravimetric Static Weighing Method. This method is as per ISO 4185 and here the flow meter is calibrated to the highest accuracy by weighing the quantity of water that passes through the meter during a known time interval. The laboratory is designed to handle a maximum flow rate of 4500 m3h and a maximum pressure of 10 bar. Pipes upto 900 mm NB diameter can be accommodated in the system.The test rig has different test lines sizes up to 900 mm NB and the laboratory is capable of extending the line size upto 1200 mm. A large underground sump of 370 m3 capacity is used to store the required water. The test rig is supplied with water at constant head from an over head tank of 50 m3 capacity and 18 m head. During operation the constant head tank (CHT) is continuously overflowed using different low pressure pumps, which can be selected according to the requirement of the test meter. Weighing tanks of capacities 30 kg, 300 kg, 2000 kg and 20000 kg are made available for the flow measurement. Diverter systems are used to divert the flow to the weighing tank for an accurately measured time period (flying start and stop method). The mass measurement is by high precision electronic balanceload cell. Time is measured using universal counter which is triggered by a photo switch connected to the diverter system. A set of high precision differential pressure transmitters are available for the measurement of pressure drop. Resistance temperature detectors are used to measure the water temperature. The density of water at flowing condition is measured using an online density meter. Together with measurement of density at the moment of each diversion enables mass readings, after correction for buoyancy, to be converted into volume. The volume is divided by the respective diversion time to obtain accurate measurement of flow rate.