Pumps add energy to a pipeline: thus outflow from a pump exceeds the inflow. (c)
ID: 1843208 • Letter: P
Question
Pumps add energy to a pipeline: thus outflow from a pump exceeds the inflow. (c) In solving a pipe network problem, one condition which must be satisfied is mass balance at each junction (Delta Q = 0). What other condition must be satisfied? Delta H = alpha Delta V/g (V/alpha + 1) (f) Obtaining the water hammer wave equation requires. (a) conservation of momentum (b) conservation of energy (c) conservation of mass (d) Darcy-Weisbach equation (g) (T or F) The laminar flow in circular pipe flow occurs at a Rynolds number about 2000. The range of Reynolds number for sludge in pipes in pipes is much smaller (less than 100). (i) identify three tacties that an engineer can use to eliminate pipeline damage from water hammer.Explanation / Answer
(D) Its true that pump increases the fluid energy by adding mechanical energy to it with the help of impellar but inflow and outflow are equal due to continuity equation or conservation of mass.
(E) Other condition of energy conservation must be satisfied in pipe network problems.
(F) Conservation of mass and momentum are required to derive wave equation in water hammer.
(G) Due to salt addition in water its density increses due to increase in mass however volume remains costant,as the speed of pressure wave is inversely proportional to density of the fluid so in case of salt water speed of pressure wave will decrease.
(H) For laminar flow reynolds number must be less than 2000.
(I) Measures to eliminate water hammer effect
(I) Reduce the pressure of water supply by fitting a regulator
(ii) Water towers can be built to maintain steady flow and trap large pressure fluctuations.
(iii) Shorter branch pipe lengths.
(iv)A hydropneumatic device which is similar to shock absorber in principle can be installed between the water pipe and the machine to stop water banging effect.
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