Getting my own tanks
- Thread starter Marie13
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They do the same around here in GA and FL. If it is banked it goes in any tank with current hydro and viz. If it is PP blended then it needs to be O2 cleaned and shops discretion if it needs the Nitrox bumper sticker.
OP
Will be experimenting with new weighting on Saturday at quarry. With 5mm currently wear 6lbs at waist and 6lbs in trim pockets on top of BP/weighted STA. Since I tend to be head UP, take 4 lbs from waist first?
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I don't have Nitrox stickers on my tanks. The VIP sticker attests that they are O2 Clean. Shops from NJ to FL have done partial pressure fills for me with no questions.
CGA
We do the same thing. If the VIS was for O2, no problem doing PP fills. I don't want to rehash the 40% vs 23.5% debate. This predates you Stu by a long time and can raise temps very fast. We made a decision in our shop to use CGA standards and that's that.
The question is whether someone will fill a non O2 cleaned tank with up to 40%. OSHA (Commercial diving standards) says treat anything under 40% as air and anything over as pure O2. CGA says anything over 23.5% is treated as O2. This is probably a good time to don a flameproof suit.
We do the same thing. If the VIS was for O2, no problem doing PP fills. I don't want to rehash the 40% vs 23.5% debate. This predates you Stu by a long time and can raise temps very fast. We made a decision in our shop to use CGA standards and that's that.
The question is whether someone will fill a non O2 cleaned tank with up to 40%. OSHA (Commercial diving standards) says treat anything under 40% as air and anything over as pure O2. CGA says anything over 23.5% is treated as O2. This is probably a good time to don a flameproof suit.
UWZen
Registered
Shedding 4lbs from an AL80 to HP80 is about right.
I like to remove as much weight from the waist as possible while maintaining a balanced rig (still able to swim up given a wing failure). With a single tank, even an HP80 in a wetsuit, you should hopefully not need more than a few lbs ditchable at the waist to be able to swim up given a true wing failure. This is a good exercise as you're getting your weighting right with new tanks, especially ones that are more negative than you're used to. Get to a platform in the quarry at about 30', dump all the air from your wing with a full tank, and then ensure you can still swim up (with or without ditching weight). If you can't, then safety dictates you need more ditchable weight so it has to go on the waist.
Regarding weight distribution/ trim: You may find you are more head heavy with your new tanks configuration due to the shorter tank placing your CoG higher. Try putting your trim pockets on the lower cam band (assuming you have them on the upper tank band as is more commonly seen right now).
I've seen the debate. Definitely no need to have it again here.
The useful point (I think) is that Nitrox stickers are meaningless (except, possibly, to a shop that wants to sell Nitrox stickers). They have nothing to do with whether you can get fills from a PP fill station (or any other kind of fill station).
Similar to the "but you have to have a Nitrox C card" story, if someone ever tells me that they can't give me a Nitrox fill because I don't have Nitrox stickers on my tanks, I guess I'll just have to pull out my Helitrox card and tell them I changed my mind. Can I please have Trimix 32/0? LOL
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