Water hammer protection measures for long-distance water transmission projects during pump stop with multiple water diversions outlets
In order to effectively avoid the potential harm caused by negative water hammer in unpro-tected pumping and power outage in multi-pump and multi-outlet water delivery systems,a mathemati-cal model of a large water supply project with a total length of 106.46 km was established to calculate the transition process of the system.The joint protection scheme of air valve and two-stage liquid-con-trolled butterfly valve and the one-way tower protection scheme were studied respectively,and the latter was optimized after the former was far from the ideal protection effect.After determining the number,location,and height of unidirectional towers in combination with engineering practice,multiple schemes were compared and selected for the bottom area of unidirectional towers at different positions.Finally,the bottom area of Tower 1# was selected as 28.26 m2,and the bottom area of Tower 2# was selected as 176.63 m2,respectively.It is found that in order to prevent the one-way tower leakage,it is needs to be closed with the diversion port and water supply terminal regulating valve.On the premise of ensuring that the maximum pressure of the pipeline does not exceed its pressure-bearing capacity,an innovative diversion port regulating valve and the water supply terminal regulating valve closing time law for the effect of comparison is conducted,so that the water transmission system can be more economical and safe stable operation.An optimization direction for water hammer protection in such long-distance multi-outlet and multi-pump water supply projects is provided.
one-way surge tankmultiple water outletsnegative water hammerair valvevalve closing law
万方数据
维普
