Having trouble trying to decide what flow rate to use for in-line oxygenation. We still do not have a DO meter, but we do have an oxygen regulator with a flow meter on it now. We used to just eyeball it with the sight glass and a regular psi regulator. I've seen a few forumlas for roughly calculating oxygen ppm, and based on what I've plugged into those, they say I should be running my oxygen somewhere between 3.5 and 5.5 LPM during the transfer (which agrees with other people's calulcations i've seen on the board).
With the old sightglass eyeball method, we would turn the oxygen on just enough so you could barely see bubbles in the sightglass with a flashlight and run it for the entire knock out. Now with the flow meter, 3.5 LPM seems like A LOT more than we were using before. I have to turn the flowmeter down to almost nothing, probably less than 0.5 LPM to get a similar flow to what we did before...
We transfer at about 23 to 24 gallons per minute through about 47 feet of 1.5 inch hose, usually around 68F. Knock out takes about 30 minutes normally.
So have we been under-oxygenating, or am I just way off here?
With the old sightglass eyeball method, we would turn the oxygen on just enough so you could barely see bubbles in the sightglass with a flashlight and run it for the entire knock out. Now with the flow meter, 3.5 LPM seems like A LOT more than we were using before. I have to turn the flowmeter down to almost nothing, probably less than 0.5 LPM to get a similar flow to what we did before...
We transfer at about 23 to 24 gallons per minute through about 47 feet of 1.5 inch hose, usually around 68F. Knock out takes about 30 minutes normally.
So have we been under-oxygenating, or am I just way off here?
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