2 replies to this topic

[chem_eng_yd]

Dear all

 

could anybody provide guidelines how to estimate pressure loss in nitrogen gas pipe line?

 

Regards

[breizh]

You need to perform Hydraulic calculations !

Consider using the search engine in this forum , this topic has been discussed many times and resources are provided .

 

Note : I've attached an excel sheet for this type of calculation .

 

Hope this helps

Breizh

Edited by breizh, 24 April 2014 - 01:22 AM.

[samayaraj]

For compressible flow, you can use Darcy formula for finding pressure drop provided the following case should satisfy.

 

P1- Inlet Pressure, P2- Outlet Pressure

 

1. If pressure drop between (P1-P2)/P1 is less than 10%, you can use the density of nitrogen either for inlet or outlet condition.

 

2. If pressure drop between (P1-P2)/P1 is more than 10% and less than 40%, the density should be average of inlet & outlet condition.

 

If the pressure drop is more than 40%, darcy formula will give more error. Hence, you have to split the pipe length into many segments. Find pressure drop in each segment such that the inlet & outlet pressure drop is less than 10%. Finally add the pressure drop in each segment will give you the overall pressure drop.

 

Note: The outlet pressure in the first segment will the inlet pressure for second segment. Accordingly take the density for each segment.

 

Also you can use panhandle & weymouth equation for finding pressure drop directly.

 

Refer this link: http://www.pipeflowc...le-gas-flow.php

 

 

Regards,

Samayaraj