Abstract
A former pipeline system for pumping water conveyance has been designed on condition that include a flywheel and other facilities for suppressing the negative pressure to 7 m or lower to prevent the water column separation. Authors examined the method for installing non-water hammer pressure check valve which is the improved swing check valve and used three in the series on the downstream in the place which is generating the negative pressure in order to suppress the water hammer pressure by sudden pump stop. The field measurement on water column separation in pump power failure and water hammer pressure caused by its recombination, and the effect of setting up the non-water hammer pressure check valve was carried out. The field measurement on water column separation in pump power failure and water hammer pressure caused by its recombination, and the effect of setting up in the series the non-water hammer pressure check valve was carried out. Then, it was possible to reproduce these phenomena accurately at the practical level by the simulation using the simplified model of non-water hammer pressure check valve and discrete cavity model of the water column separation.
