![]() Lets look at upstream for now, assume the system can withstand an additional 50 psi upstream of the valve (static pressure 100 psi and system rated for 150). (diameter, pressure and flow do not matter for amount of surge pressure) A valve is 1000 ft from the upper tank, the water is flowing at 10 ft/sec. As you close the valve a pressure wave develops as a higher pressure upstream and a lower pressure down stream, the time it takes this wave to reach a point where the water does not have velocity is based upon the speed of sound in water (about 2000 ft/sec) For example, two tanks with water flowing from the upper tank to lower tank through a 3000 ft pipe. Marks handbook has a short bit on waterhammerįor every 1 ft/sec of velocity there is a 50 psi surge on a sudden stoppage, so that give you the magentude of the surge.
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