6 replies to this topic

[Ajay S. Satpute]

Dear all,


I have never done line sizing of PIPELINES so far. Therefore this post has come.


Taking input from internet, API etc. I have prepared an excel sheet (attached herewith) with pressure drop calculation equations. The formula have been double checked by me and I believe it should be correct. The excel answers match approximately with that of hysys output for the same set of input.


Request you all to kindly see the excel file please. I have following questions;


1. Should there be any difference in pressure drop calculation equations for PIPING and PIPELINE? I believe there should not be any. I need to confirm this please.


2. In IPS-E-PR-440 (refer http://www.cheresour...id-line-sizing/), service pipeline company equation (for pressure drop) for single phase crude oil in PIPELINE is provided. What is the basis/origin of this equation?


3. Can we use Darcy-Weichbach equation for liquids in PIPELINE?


4. Can we use Hazen-Williams equation for water in PIPELINE?



5. Similarly other equations available for PIPING (Weymouth, Panhandle, Spitzglass, Babcock, modified Darcy equation for two phase flow) are also valid for PIPELINE?

I have seen several interesting threads in this site, but I could not be satified.



Thanking you in advance.



Ajay

Attached Files

•  Pressure drop calculation equations for PIPING and PIPELINE.xlsx   63.64KB   313 downloads

[markymaark]

1) No. Some Pipe equations may say a 12" line will Have "X" Pressure drop per 100ft. Then pipeline equations will have you input the pipe length.

2) Just a conversion from volumetric -> velocity

3) Yes. To get a better friction factor look at Moody Diagrams (Perry's or other sources).

4) It's empirical, so results may be drastically different if your criteria differ from theirs.


BUT. Most of all, pipe length is not just how far Start->Finish. You need to take into account Equivalent Length. That is..valves, U-Turns, etc will cause a pressure drop as well. You will need a seperate calculation to see the total Length of pipe.

Mark

[Santoshp9]

Dear Ajay,
Great work done by you in both excel sheet,
(1.Line size criteria as per different standard & 2.Pressure drop calculation equation for pipe)
Thanks.

[Ajay S. Satpute]

Thanks Mark for your reply.

Thanks Santosh for the encouragement.

Regards.

Ajay

[AVINASH UTTAM WAGH.]

Thanks.

[katmar]

Ajay,

Some very useful and interesting articles have been published by the Pipeline Simulation Interest Group on the comparison of various "historical" methods. Two good ones to start with are

http://www.psig.org/...s/2000/0112.pdf
http://psig.org/Papers/1980/8801.pdf

[Ajay S. Satpute]

Mr. Katmar,

Thanks a lot for those 2 great articles.

Regards.

Ajay