Suggested 02 Bank Storage Bottle?

[Tracy]

Same. Do you have a link, manual, or other info?

No. Just the information I posted above. The pump is based from a Philips ultrafill oxygen booster. It is a three stage booster. I rework the inlet to feed from a BC nipple and install a DIN fill hose. Add LP and HP cutouts, and wire in controls. I have made and sold about 15 of them. I have parts to build another 13. I purchased a large lot of new COVID surplus a year or two ago and started making them in my free time.

 

[SavageSeaCow]

No. Just the information I posted above. The pump is based from a Philips ultrafill oxygen booster. It is a three stage booster. I rework the inlet to feed from a BC nipple and install a DIN fill hose. Add LP and HP cutouts, and wire in controls. I have made and sold about 15 of them. I have parts to build another 13. I purchased a large lot of new COVID surplus a year or two ago and started making them in my free time.

What is 100ml per hour in terms of psi in a three liter bottle? How long are looking to go from 100 bar to 200 bar?

 

[Tracy]

What is 100ml per hour in terms of psi in a three liter bottle? How long are looking to go from 100 bar to 200 bar?

It is 100 lph, not ml per hour.
3L bottle at 200 bar is 600 L
To go from 100 to 200 bar would require adding 300L so it would take about 3 hours.
That is why I made them automated. You hook it up, turn it on, and go to bed. They are full in the morning.
In addition to the high and low pressure cutout switches, there is also a thermal cutout on the pump motor and a burst disc on the high side in case of malfunction.

 

[SouthernSharktoothDiver]

@Tracy How long could you run one of those at a clip before it became an issue? I'm sitting here wondering if I could buy a T-cylinder full of breathing grade air and use a booster to full my Al 80's, save myself the drive. (I seriously doubt this is economically or mechanically feasible, but I like coming up with hypothetical overly complicated solutions to minor problems. Sue me)

 

[Tracy]

@Tracy How long could you run one of those at a clip before it became an issue? I'm sitting here wondering if I could buy a T-cylinder full of breathing grade air and use a booster to full my Al 80's, save myself the drive. (I seriously doubt this is economically or mechanically feasible, but I like coming up with hypothetical overly complicated solutions to minor problems. Sue me)

It would certainly do it, but why you would ever want to boost air is beyond me. It would definitely cost you way more than an air fill ever would. Even if you bout 5 extra AL80s to get filled while at the shop.

 

[justinthedeeps]

Pro cleaned SCUBA 'bank' cyls of O2 filled by a local shop for under ≤$50 (plus gas value) within ≤30 min drive with reasonable turnaround sounds convenient enough (otherwise not)

Has there ever been a fire while trans-filling O2 from a 'bank' O2 SCUBA cylinder into a CCR cylinder?

Boosters / owner bottle of ABO etc etc (ideally shared among multiple divers) is great but best done by those w/ training/mentorship/experience in this area, could potentially kill operator (or others) and destroy everything nearby (though very rare?)

Then there's all the liability, insurance, reputation, press etc (whether for shop or independents)

 

[inquis]

Using two AL80s (starting at 3000 psi) to transfill a 2L after 3 hrs of diving (ballpark 1900 psi/130 bar used, reserve > 1 hr), you can get about 15 hrs of diving in before having to top up the O2 bank. (Adjust to your needs, of course.)

I wouldn't mind having a booster, but the acquisition cost of a couple used AL80s (even including new hydros and O2 cleaning) is pretty low by comparison. The transfill route has been working for me with plenty of time to have the LDS fill the bank between weekend trips.

 

[Rollin Bonz]

As others have said, LP tanks are your best bet. The bigger the better. LPs mean more volume at a lower pressure. If you have a shop that'll boost O2 at all, consider yourself lucky. We were only able to get bank fills on O2 from the shop, so we got whatever pressure the bank was at (at best). I have 4 LP120s O2 cleaned that we used for O2 banks and we initially transfilled our AL13s. I was able to pick up a mini booster for a steal that made life easier. Eventually we went with a big bottle from the gas supply. Super cheap gas (less than $20 for a tank swap). The tank rental is $75 per year, but I think they only charged me once when I first got the tank.

If you think transfilling might be adequate, set up a spreadsheet using the formula for Boyles law. Then plug in various tank sizes and pressures to see what transfil results you will get with each one. You'll get hard numbers that will help you decide what tanks are best for your situation.

Use that spreadsheet to calculate the numbers for a 200cf bank tank. Even starting at 2200 psi, with a 200cf bank and transfilling to a 13cf tank, you can get a lot of gas transferred before the pressure gets too low. Back of the napkin math so don't hold me to these numbers I'm not actually even using a napkin... if it's 200cf at 2200 psi, transfilling down to 1500 is going to provide 70cf, so maybe 7-10 "fills" of your AL13 starting at 2200psi and dropping to 1500psi, then get a fresh bottle for $20 and repeat. Gotta lug that big bastid back and forth to the welding supply, but if that's not an issue, it might be worth it.

 

[SouthernSharktoothDiver]

@Tracy Out of curiosity, what does the maintenance schedule/cost look like?

 

[Tracy]

@Tracy Out of curiosity, what does the maintenance schedule/cost look like?

Philips built the pump with an estimated 3000 hour life. There are medical oxygen service companies that can service/rebuild them. I have been using mine for a couple of years with regular usage and have yet to have any issue. There isn't any maintenance on them. As to rebuild at EOL, I have no idea. These are new zero hour pumps that I am using.