Uncertainty Analysis of Large Water Flow Calibration Facility

摘要

The large water flow calibration facility, the primary standard of water flow rate in Japan, is one of the largest calibration facilities for water flow meters in the world. This facility covers the flow rate range of 0.014 to 0.83 m~3/s(50 to 3000 m~3/h). Flow rates are maintained by seven pumps and an overflow head tank. A water flow meter under test is installed in one of the test lines whose inner diameter (D) ranges from 100 to 1100 mm with a minimum upstream straight pipe length of 100D.