供水系统间歇式供水方式会造成主管道内部产生负压，高位水池(水库)供水管道很长时也容易产生负压。
The intermittent supply mode in water supply system will lead to negative pressure in the main pipe, and the same phenomenon also exists in long downcomers of elevated basin (reservoir).
喀什中亚南亚工业园目前已建成提升泵站、高位水池和23.6公里供水管道，可保证24小时不间断供水。
Kashgar Middle and South Asia Industrial Park now has built 2 lift pumps, a head tank and 23.6 km pipelines which can constantly supply water 24h a day.
本课题来自唐公塔泵站的液位联锁系统，该系统实现高位水池与二级泵站、低位水池与一级泵站间的液位控制连锁，以保证水池液位始终保持在规定的安全限度内。
The task comes from a real problem of water level controlled at Tang Gong Ta pump station, which is a water level controlling system for safe range between pool and electric moter.
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