Multi-purpose pumping stations for the North-Chiba Water Conveyance Project

摘要

Ebara has designed, produced, and installed pump equipment for two multi-purpose pumping stations as part of the North-Chiba Water Conveyance Project, a 20-year project just completed whose objective lies in minimizing water pollution and establishing a water source. The total length of the waterway built in this large-scale project extends 30 kilometers. The following, the first report of a series, introduces specific pumping problems that had to be solved, as well as coordinated pumping operation by the two stations, flow rate control, and measures against water hammer effects. The topics discussed are flow rate control for maintaining the level of a closed portion of the waterway to be below the standard dam discharge level, operation conditions involving pump head fluctuation caused by the amount of water conveyance, water hammer prevention using one-way surge tanks (tank area: about 250 m{sup}2), and pumping conditions when the set level of the one-way surge tanks is higher than the discharge level.