Transfill? Meaning like if I have an air bank? (Which I dont)
Overfilling and life expectancy. (LP Tanks)
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Transfill? Meaning like if I have an air bank? (Which I dont)
Leadking
Contributor
I am speaking of catastophic failures and the actual number, not percentage.
That wasn't in my PSI class. I've never heard of a Steel Tank fatality in the USA.
I have 4 sets of LP tanks. Some as old at 1976. Everytime they get filled, it's at least to 3600, and usually 4k. They've never failed a hydro.
Oh, and your math is wrong. LP95's filled to 3400 is not 119. It's 122. 95/2640 x 3400 = ???
SandyRobinson
Contributor
Appreciate the factual info, its better than parroting non facts.
ajduplessis
Contributor
Firstly you will never know if overfilling is the cause of hydro failure. Secondly hydro failures is a no-event, it just makes a huge noise. Our local inspection shop see at least 5-6 plus hydro failures a year and include both steel and ali. I agree that it is very unlikely to happen. Why take the risk, just buy something bigger if you need the capacity.
VooDooGasMan
Contributor
Why buy bigger, everything is overated, the reason people do not like getting permits is the overkill in structural engineering, take a PT slab, for every cable you need two more for the most part. same with tanks, they know people will go past recomended, its a given. who cares if if fails hydro, that is your safety factor. mine never will cause I have many tanks and rotate them.
Jeff the transwhip is to fast fill without heat, with your own compressor, buy tanks cheap on craigslist, having sets of doubles helps also. if you have banks eventually great, if not this way you want three tanks filled you transfer air out and lets say they are at 2300 psi, so you spend 5 mins transfilling and 15 min filling, an hour later another 10 mins topping off.
Jeff this is just an option when in a time crunch you need tanks filled. I dive dubs right now almost everyday, when spearing begins I just use a backpack al50's al63's 3000 faber 80's(small tank) these are usually 100' or less and these transfer without much of a hit on dubs, except the 80's.
When I get time I fill them up, I do not like to run my compressor for very long, its harder on it and the filters.
Now PP blending, just fill some tanks to say 60 ta 70% o2, then when you want 32% or what ever for a dive, you can transfill if quicker because of reduced o2% from 100% o2. and once you have leaned a calc on your tank as you put so much 60% into your 32% and top off to get around the 32% again, and it is fast with just a top off. I use 140's series of four tanks for holding my bank nitrox.
jeff once you have a compressor you will want to find all options and play with physics, then o2 booster, or a nitrox stick. I stick with the basics and when I get a few hours on compressor I sell and buy a new one, My cost are so minimal for a few hundred dives a year.
Jeff the transwhip is to fast fill without heat, with your own compressor, buy tanks cheap on craigslist, having sets of doubles helps also. if you have banks eventually great, if not this way you want three tanks filled you transfer air out and lets say they are at 2300 psi, so you spend 5 mins transfilling and 15 min filling, an hour later another 10 mins topping off.
Jeff this is just an option when in a time crunch you need tanks filled. I dive dubs right now almost everyday, when spearing begins I just use a backpack al50's al63's 3000 faber 80's(small tank) these are usually 100' or less and these transfer without much of a hit on dubs, except the 80's.
When I get time I fill them up, I do not like to run my compressor for very long, its harder on it and the filters.
Now PP blending, just fill some tanks to say 60 ta 70% o2, then when you want 32% or what ever for a dive, you can transfill if quicker because of reduced o2% from 100% o2. and once you have leaned a calc on your tank as you put so much 60% into your 32% and top off to get around the 32% again, and it is fast with just a top off. I use 140's series of four tanks for holding my bank nitrox.
jeff once you have a compressor you will want to find all options and play with physics, then o2 booster, or a nitrox stick. I stick with the basics and when I get a few hours on compressor I sell and buy a new one, My cost are so minimal for a few hundred dives a year.
I've got a full nitrox set for it (o2 analyzer, and mixing stick). The guy I'm getting the compressor from has some big air bank bottles, so figure I'll get at least 1 and maybe 2. Then I can fill(top off) from those, and not the compressor. Or like you said, if I need fast air, I have those available.
BTW, how many tanks to you rotate through, I have 8 95's.
BTW, how many tanks to you rotate through, I have 8 95's.
VooDooGasMan
Contributor
I have 40 plus scuba tanks, 1/2 dozen or so o2 provider tanks, helium, oxygen and argon commercial tanks.
Hydro failures during testing don't make any noise. You clearly don't know how tanks are hydro'd. So let me help you out.
During a hydro, a tank is filled with water. That water is pressurized to 5/3'rds the working pressure of the tank (on most tanks anyway) When we attempt to pressurize this water in the tank, the water is pushed into a graduated cylinder and measured at 5/3'rds working pressure. Then we drain the tank. The volume of water in the graduated cylinder must return to our starting level +/- 10%. If it doesn't, the tank fails. No big boom, no cracks, no wooshes. Just a water level not returning to the proper mark on a graduated cylinder. Of course this is a mundane description, but you get the point. I hope.
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