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).
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。
According to the welding properties of P91 and C12A steels, the paper presents a welding solution to assemble C12A water pressure valve to P91 main steam pipe in field.
根据P 91和C12A钢的焊接性能，提出了现场中在P 91主汽管道上加装c 12 A水压闸阀的焊接工艺措施。
Because of fast close of speed open-shutter, the shocking pressure is produced in supply water pipe, This is the main causes of break of supply water pipe and its sleeve.
在洪水管路中，由于快速开闭器的速关而产生的冲击压，是供水管路和接头破裂的主要原因。
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