Which book discusses the water hammer phenomenon and control measures?

This post was last edited by Lantian on 2016-12-20 at 16:51. Why do we have to look for books? It’s available on Baidu Baike. Water hammer phenomenon: In pressurized pipelines, a sudden change in the flow rate of water occurs due to some external factor (such as a sudden closure of a valve or the sudden shutdown of a water pump), which leads to water hammer. This hydraulic phenomenon is known as water hammer. It poses significant hazards in the chemical industry. Measures to prevent water hammer: a. Water hammer caused by opening and closing valves too quickly: (1) Extend the time taken to open and close the valves. (2) Centrifugal pumps and coagulation pumps should be stopped when the valves are closed at 15%-30% rather than fully closed. b. Water hammer caused by pumps: (1) Remove the air from the pipeline and fill it with water before starting the pump; automatic air release valves should be installed at all elevated points in long-distance water transmission pipelines. (2) Pump shutdown water hammer is mainly caused by the rapid closure of the check valve on the outlet pipe; therefore, removing the check valve can eliminate the hazards associated with pump shutdown water hammer, as well as reduce head loss and save energy consumption ； Based on experiments conducted in some major cities, it is believed that the primary pump room can be eliminated, while the secondary pump room should not be removed ； When removing check valves, it is necessary to perform calculations regarding the water hammer pressure. To reduce and eliminate water hammer, micro-resistance slow-closing check valves are commonly installed in large-diameter pipes nowadays. The use of buffer check valves and slightly closed butterfly valves installed on the outlet pipes of large-diameter pumps can effectively eliminate water hammer when the pump stops operating; however, since a certain amount of water flows back during the operation of these valves, the suction well must be equipped with an overflow pipe. A water hammer arrester is installed immediately adjacent to the check valve and downstream of it.

I am aware of these measures, but what I want to do is calculate the closing speed of the control valve, in order to determine the valve closing time through calculation. If a manual method is used, this can be avoided by closing slowly, but with a control valve, I need to set the opening and closing times.

I am aware of these measures, but what I want to do is calculate the closing speed of the control valve, in order to determine the valve closing time through calculation. If a manual method is used, this can be avoided by closing slowly, but with a control valve, I need to set the opening and closing times.

This post was last edited by Lantian on 2016-12-21 09:30. If you ask the valve manufacturers, someone there will know. Search the forum; there are discussions on this as well. http://bbs.hcbbs.com/thread-841445-1-1.html