Re: [PipingDesign] Pressure Drop Calculation

From: <adolphus.o.omodu@exxonmobil.com>
Date: Wed May 19 2004 - 10:13:00 EDT

Kandarp,

Flow is always accompanied by friction. This friction results in a loss of energy available for work. A general equation of pressure drop due to friction is the Darcy-Weisbach (often called simply Darcy's equation or formula ).This equation is expresed in meters of fluid as:

h(subscript: L) = f(subscript: m)LV(superscript: 2)/2gD

Where ;

h(subscript: L) = frictional head loss

L = Pipe length
V = Velocity of the fluid under consideration
D = Internal diameter of pipe

f(subscript: m) = The moody friction factor which is expressed as ( f (subscript: m) = 4.0f(subscript: f)) where f(subscript: f) is the fanning friction factor.
g = The accelaration due to gravity

The Darcy-Weisbach equation is valid for both laminar and turbulent flows of any liquid, and may also be applied for gases with certain restrictions. When using this equation, changes in elevation, velocity, and density must be accounted for by applying Bernoullis's theorem. The Darcy-Weisbach equation must be applied to line segments sufficiently short such that fluid density is essentially constant over that segment.

Adolphus O Omodu

                       kandarp sitwala
                       <kampan707@yahoo.com>          To:     
PipingDesign@yahoogroups.com
                                                      cc:
                                                      Subject: [PipingDesign]
Pressure Drop Calculation
                       05/17/04 04:29 AM
                       Please respond to
                       PipingDesign

Hi!
Actually I want the correct procedure to find the pressure drop in a line.
I have downloaded some softwares like "Pressure Drop Calculator from KARF ENGG". But I am not sure about its authenticity.
Can anyone please give me in detail (with equations) the procedure to find the pressure drop. Regards

Kandarp

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Yahoo! Groups Links Received on Wed May 19 10:13:00 2004