Dear Cobraaa, For this calculation you need to consider the internal tank pressure. So you need to know which is the maximum design tank internal pressure. If you see the API 650, there is an appendix F, which with a simple flow diagram gives you how to estimate the tank design pressure (the flow diagram is related with constructive data, and material data and it is done for select the corresponding constructive method or code for small internal pressure API 650 tanks; if you increase the internal pressure more than 2,5 PSIG you need to use API 620). When you have the pressure data you need to know the installed valve characteristics, I don't know if all breath valve have the same CV, but I supose that it depends of the manufacturer design, and consider if you are brething to a system or to the atmosphere, in order to get the existing back pressure after the valve. I don't know if the API 2000 gives you something different as I heard that in the last version It changes a lot. I hope it helps you.
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