Hydraulic Calculation For Jet Fuel Pipeline

Dear Members

 I am working on the project of Jet fuel  pipeline project to airport. I  had done hydraulic calculations and submitted report for client review. I had receive dthe comment on the calculation report as- hydraulics shall be performed for taking maximum density value ( 840 kg / m3 )  for the Jet fuel because it will result in higher pressure drop values. currently in the calculation I had considered density value as 800 kg / m3.

I am not sure whether the comments marked on the report are correct ? how the increase in density value will result in higher pressure drop value ?

its the velocity is the main factor contribute  for increase in pressure drop value .

awaiting for the valuable advise.

thanks in advance.

Regards

Vaibhav

Hi Vaibhav,

Reynolds number  is related to Density, friction factor is related to the reynolds number, pressure drop is related to friction factor, hence pressure drop is related to density.

I would recommend you to read Crane Manual or Ludwig 1 (Applied Process Design) for understanding line hydraulics.

Edited by Chemitofreak, 24 April 2019 - 02:34 AM.

Hi,

To convince yourself , consider this simple excel sheet  valid for Non compressible fluid .

Review the comments above and perform calculation .

yellow input data ,

orange calculation 

good luck

Breizh

It is not possible to say whether the comment you received is valid or not without knowing further information.

If the specification for the pipeline was given in volumetric terms (eg litre per hour) then it is true that a higher density will result in a higher pressure drop.  However, if the specification was given in mass terms (eg kg per hour) then the higher density would result in a lower pressure drop.

If the spec is given in volumetric terms then changing the density has no impact on the velocity but it does affect the Reynolds number and therefore the friction factor.  When working in mass terms changing the density has a direct effect on the velocity but no effect on the Reynolds number or friction factor.

I expect that you have designed for a specific volume flow rate. Also, you should remind your client that the pump differential will increase in proportion to the density. As will the pipeline pressure drop. If you work the arithmetic you will find the system will perform satisfactorily whatever the density. But clients are not known for their strength in any area of engineering. So, humor them and collect more money for your time. You must remember the golden rule, however. The client has the gold, so she makes the rules.

Bobby

Edited by Bobby Strain, 03 May 2019 - 10:10 AM.