Water hammer in pipe lines takes place when
Option (A)
Fluid is flowing with high velocity
Option (B)
Fluid is flowing with high pressure
Flowing fluid is suddenly brought to rest by closing a valve
Flowing fluid is brought to rest by gradually closing a value
Correct Option:
Question Solution:
When the water flowing in a long pipe is suddenly bought to rest by closing the value or by any similar cause, there will be sudden rise in pressure due to the momentum of the moving water being destroyed. This causes a wave of high pressure to be transmitted along the pipe which creates noise known as knocking. This phenomenon of sudden rise in pressure in the pipe is known water hammer or hammer blow