Aerating with pure oxygen

[balkan_brewer]

Hello,

Last summer I started preparations for opening a nano brewery of my own and also launched crowdfunding campaign. Now I can say that my brewery is ready to start, a dream came true. I have a 250 liters (cca 62 gallons) per batch HERMS system and 500-liter fermenters.
I plan to aerate wort inline with pure medicinal oxygen using a 2-micron stainless aeration stone. My question is:

How much milliliters of oxygen do I need to get in the wort? I know brewing standard is 8-10 ppm but I don't have the dissolved oxygen meter.

Let's say I want 9ppm of O2 in 250 liters of wort. Could this be the equation:
9mg/l * 250l = 2.250mg/l or 2.25 liters of pure O2 in 250l of wort?
I could monitor O2 inflow through the output regulator on the O2 tank.

 

[jmark]

First of all, congratulations on living the dream!

The calculation is a little more complicated than what you laid out as you need to take into account the molecular weight of O2. There's a calculation in this thread that walks through the numbers...

http://discussions.probrewer.com/showthread.php?40225-Oxygenation-ppm-Lpm-calculation

You also need to figure out how efficient the transfer would be too as depending on your flow rate and setup, getting 100% into solution isn't likely. I use a flow meter and a wand and that's obviously less efficient than an inline approach, but I only assume around 15-20% efficiency.