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http://www.ogj.com/articles/print/volume-98/issue-31/transportation/hydrostatic-testing-1-pressure-ratios-key-to-effectiveness-in-line-inspection-complements.html this article looks interesting

I can imagine very long pipelines with significant elevation differences. differences in pressures at the lowest points will be significant. Thank goodness our pipelines are only few miles long and less than 150ft elevation change.

make a simple sketch of the system, calculate the NPSH available and make sure it is more than the NPSH required.This link helped me understand, take your time and read it carefully, http://www.engineeringtoolbox.com/npsh-net-positive-suction-head-d_634.html

A very hearty thank you gentlemen, for the education. Much appreciated.

thank you Zdas04 I know what SMYS means, I do not mean that you test at 100% SMYS, its simply the criteria for calculating the internal design pressure consider the equation below without any factors P = 2 X SMYS X t/OD 100% SMYS simply means that if the pipe is X52 for example, the internal...

sorry for late reply, was away for a week on vacation, Thank you BigInch, this is a pipeline that starts and ends at storage terminals but goes under the Houston Ship Channel, so we have ANSI 150 class flanges, thats why 285psig is our maximum operating pressure. I think that when the pipeline...

thread798-229469 BigInch, thank you for the awesome contribution in the above referenced thread, I think there is a lot of confusion even amongst experienced engineers with this subject.

thread378-182689 I have been reading the above referenced thread but can someone clarify how the maximum hydrostatic test pressure is determined. I am planning to hydrotest a pipeline. approx 2 miles long, SMYS is X52, ERW, 16" OD Design pressure is 1460psig MOP is 285psig I have determined...

I am an EIT (mechanical) just starting out at a new job, I am looking to gather the best resources for getting up to speed in "pipeline hydraulics": pump selection, design, surge analysis,relief calcs, friction loss, hydraulic gradients etc. anyone have any ideas? would be nice to find a book...