After reviewing eighty post from my search I did not see this discussed.
I was diving in South Florida this week and got Nitrox fills at a well known shop that is VERY reputable.
I saw several people ahead of me kicking their tanks back and forth rolling them to "stir up the gas."
My BS meter went into the red and my curiosity meter pegged!
I asked how could that work?
My thoughts are:
#1 That with partial pressure blending you get a partial fill of O2. Now you top that off with "air" at considerable force which in my mind (not an expert) would surely mix these gases.
#2 Even if you roll the tanks back and forth the tanks do not have paddles in them to stir anything up and you can recreate this experiement by adding some water and oil in a clear soda bottle and roll it around.. does not mix very well.
#3 If the O2 and Nitrogen seperated that severly what happens when you leave it upright in your house for a week and then dive it?
I am just looking for a Expert opinion. In my mind my three conclusions are very sound but it would not be the first time I am wrong.
I saw MANY people doing this and the shop said that this is a FACT and rolling the tanks makes a difference.
Eric
I was diving in South Florida this week and got Nitrox fills at a well known shop that is VERY reputable.
I saw several people ahead of me kicking their tanks back and forth rolling them to "stir up the gas."
My BS meter went into the red and my curiosity meter pegged!
I asked how could that work?
My thoughts are:
#1 That with partial pressure blending you get a partial fill of O2. Now you top that off with "air" at considerable force which in my mind (not an expert) would surely mix these gases.
#2 Even if you roll the tanks back and forth the tanks do not have paddles in them to stir anything up and you can recreate this experiement by adding some water and oil in a clear soda bottle and roll it around.. does not mix very well.
#3 If the O2 and Nitrogen seperated that severly what happens when you leave it upright in your house for a week and then dive it?
I am just looking for a Expert opinion. In my mind my three conclusions are very sound but it would not be the first time I am wrong.
I saw MANY people doing this and the shop said that this is a FACT and rolling the tanks makes a difference.
Eric