Pipe Line
what is the purpose of us to calculate pressure drop for line pipe sizing?
i had calculate the velocity for the fluid flow in pipe from the maximum flow rate that already given..so now, i just want to know the important of calculate the pressure drop..thanks to all engineer
You have calculated the pd using following formula:
Q=Area x Velocity
Above formula is neglect the friction which causes the head loss.
If there is a pump discharging some liquid and you are using the pump based on your simple calculation ,then there is a chance that you will not sufficient head or you have run the pump sacrificing flow to achieve sufficient head.
Head loss due to friction
=friction factor*length*velocity^2 / 2*g*diameter
*Pressure drop is a term used to describe the decrease in pressure from one point in a pipe or tube to another downstream. This is usually the result of friction of the fluid against the tube. Tube convergence, divergence, turns and other physical properties will affect the pressure drop. High flow rates in small tubes give larger pressure drop. Low flow rates in large tubes give lower pressure drop.
For example, in a typical garden hose the pressure in the hose is 40 psi and at sea level the atmospheric pressure is about 15 psi. Therefore, the pressure drop across the nozzle is 25 psi.
Refer source link and find the difference .
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