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The flow rate is the rated flow of the device which I found from the product literature.

Katmar thanks for bringing up that consideration. This is for designing a nitrogen control cabinet though whose purpose is to supply instrument gas to surge valves

Yea we are going to comply with the API guideline. Taking into account the wall thickness I am most likely going to have to upsize the inlet piping.

Thanks for catching that latexman. I am going to adjust that on the calc sheet as that does have a major impact.

I am no longer using the free calc data. I updated the datasheet per the suggestions above (divided by 1000 for pa to kPa) the inlet loss is just a hair below the threshold when using 1/2" tubing.

This is for relief case so the higher velocity can be tolerated.

Thank you guys very much for reviewing the calculation sheet. I did the unit check per your suggestions and the result is much better.

Hello, I need some help in determining why my calculated pressure drop is so high using the GPSA methodology vs results from a calculator such as free calc. In the attached I have a side by side comparison of the results between the 2 methodologies. It is peculiar because the calculated...