Pages: 6-16

Abstract

Using water distribution pipes is one of the water transferring methods. This method while reducing water loss makes it possible to transfer the desired volume of water with the desired intensity. Unsteady flows in the pipes can occur in various forms that one of their variants is transient flow which is known as water hammer. These flows appeared as pressure waves and if one cannot restrain them in some ways, they can cause irreparable damages. The current research tries to introduce water hammer phenomenon and investigates the effects of changing diameter, thickness and different flow rates on dynamic loads caused by water hammer. Finally, it was observed that, in the same conditions, the effect of GRP pipe in reducing the maximum rate of water hammer is 25% less than steel pipe. Increasing the maximum rate of water hammer due to a very small increase in the thickness of the tube is about 1%. Doubling the moment of inertia reduced the maximum rate of water hammer about 42%, which was done by the water hammer software.