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Detailed Analysis Of Tank Venting Requirements

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#1 Dacs


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Posted 28 August 2009 - 01:48 AM

I've been tasked to validate the blanketing requirements set forth by the FEED company (the project is currently in Detailed Phase).

I got hold of the inbreathing values (from FEED), both for liquid out and thermal venting.

I used API 2000 to do my own calculation and while the required blanketing flowrate for liquid out checks out, the FEED values for thermal venting is roughly 2-3x than what is indicated in API 2000.

The tanks in question have temperatures above 120°F (the tanks have no insulation) and as per Sec of API 2000, cases like these require more detailed analysis. I think that this may be the cause of the discrepancy in values.

Since I haven't done this kind of task before, can anyone point me out to the right direction on how to deal with the more detailed analysis? What I have in mind is doing some heat transfer modelling of the whole tank during a rainstorm (worst case) and calculating the decrease in vapor volume inside the tank.

BTW, the fluids concerned are 25% DEA and sour water.

Thanks in advance :)

Edited by Dacs, 28 August 2009 - 01:50 AM.

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