事故停泵水锤对压力管道的影响

Effect of water hammer to pressure pipes for pumping accidents

介绍了大战场泵站的基本情况,对该泵站由于事故停泵水锤造成压力管道破坏的现场进行了调查.基于水锤理论并运用水锤特征线法,建立了事故停泵水锤计算的数学模型,模拟了事故停泵水力过渡过程中的水泵参数及压力变化过程,绘制了该泵站事故停泵的最大、最小水头包络线.通过计算结果及对泵站压力管道破坏情况的分析,得出此次管道破裂是由于事故停泵产生过高水锤压力,沿管线多处出现负压,管道存在质量问题等原因造成.提出的解决方法是更换破坏的管道,同时在管道凸起(3#镇墩)K0+075处及(6#镇墩)K0+201处设进排气补气阀,防止事故停泵时管道产生过大的负压.

An introduction of the Dazhanchang pumping station and an investigation of the broken pressure pipes caused by pumping accident in the pumping station are presented. According to the theory of the water hammer and its characteristic, the calculating model of the pumping accident is built. The change of the water pump parameter and the piping pressures in pumping accident transition process are simulated, and the highest and lowest head envelope curves are obtained. By analysing the result combined with the local investigation, the main reason is deduced. Pumping accidents result in excessively high water hammer pressure. The negative pressure occurs along pipes. The quantity of the pipes can not meet the design requirement and so on. The measures to deal with the problem are given as following： changing the destructive pipes and installing the air inlet - outlet valve on 3＂ and 6＂ anchor blocks can avoid the excessively high negative pressure.