Oxygen Boosting Safety

[Jimchris]

Set the drive gas to stall the booster near the specified pressure. For example, on an AG30, setting the drive gas to 36 psi it should stall near 1100 psi output.
Static outlet stall pressure formula: 30 Pa (Pa = air drive pressure)

 

[Tracy]

Dumb question.... is there anything out there that will stop at a certain psi?

Like for PP blending, mixing 50%, I need 1101psi O2. 30-60 psi a minute would be 18-36 min. Is there anything that would stop at 1101 available to the recreational mixer? Set it and work on something else?

I use an aquatic environment panel reg to throttle the inlet of my oxygen booster to 1000 psi. You can set them to anything from 1-6000 psi. They are fairly reliable and robust, but outlet does tend to vary some depending on source gas pressure.

 

[tbone1004]

Dumb question.... is there anything out there that will stop at a certain psi?

Like for PP blending, mixing 50%, I need 1101psi O2. 30-60 psi a minute would be 18-36 min. Is there anything that would stop at 1101 available to the recreational mixer? Set it and work on something else?

If you want it that precise you'll need a digital pressure transducer *same that we use to cut off compressors* and you'd need a high pressure solenoid to cut the gas supply off *about $600 and BIG*.

If you're using a booster you can use the same transducer and shut it off either directly at the motor with a Masterline or on a drivegas solenoid with a Haskel but this will only work if the supply side is lower than the boosted side because they equalize passively.
If you're using a pneumatic booster you can set the drive regulator to stall like was said above but it's not terribly precise, i.e. with a Haskel you are +100 psi from your intended pressure.

You can go with an output regulator like @Tracy said but they're unbalanced so while they're "close" they're not terribly precise.

 

[rob.mwpropane]

I use an aquatic environment panel reg to throttle the inlet of my oxygen booster to 1000 psi. You can set them to anything from 1-6000 psi. They are fairly reliable and robust, but outlet does tend to vary some depending on source gas pressure.

No booster, just whipping 2 tanks.

 

[rob.mwpropane]

not cheaply. You would need a high pressure solenoid with a digital pressure sender that was programmable. Easily $1500 to sort that out

Well... looks like I'm babysitting then, lol.

 

[Tracy]

No booster, just whipping 2 tanks.

It doesn't have anything to do with a booster, that is just what I am using it for. You would use it on your outlet line. If you have it set for 1050, even as source gas drops, it won't go over 100 and you could walk away. Come back later, make some quick adjustments and be done.

 

[tbone1004]

Well... looks like I'm babysitting then, lol.

I edited post to be a bit more robust as you were quoting it, but yeah it's not cheap/small/easy.
$700 for a 3000psi solenoid valve and the digital pressure switches are about $300.

 

[rob.mwpropane]

It doesn't have anything to do with a booster, that is just what I am using it for. You would use it on your outlet line. If you have it set for 1050, even as source gas drops, it won't go over 100 and you could walk away. Come back later, make some quick adjustments and be done.

Link to something... sounds like that's great. Thanks!

All our regs do like 0-125psi delivery pressure.

I edited post to be a bit more robust as you were quoting it, but yeah it's not cheap/small/easy.
$700 for a 3000psi solenoid valve and the digital pressure switches are about $300.

Still too much $... I know i'm in the wrong hobby..

 

[tbone1004]

@rob.mwpropane
the regulator @Tracy is probably talking about is this one

Hand Adjustable Reducing Regulator FT-4155000

This FT-4155000 Hand Adjustable Reducing Regulator fits 415-5000

filtertechs.com

Has 2x inlets and 2x outlets so the theory is you have an inlet line and inlet pressure gauge, then outlet line and outlet gauge *same as a welding regulator*.
Like I said though they aren't terribly precise because they are only intended for rough filling so in your 1101psi case, you'd set it at about 1000psi and you can walk away, then the final 101psi would have to be with you watching. You're probably at $600 for that with gauges and fittings, but it's a lot less painful than the digital control version.

 

[rob.mwpropane]

@rob.mwpropane
the regulator @Tracy is probably talking about is this one

Hand Adjustable Reducing Regulator FT-4155000

This FT-4155000 Hand Adjustable Reducing Regulator fits 415-5000

filtertechs.com

Has 2x inlets and 2x outlets so the theory is you have an inlet line and inlet pressure gauge, then outlet line and outlet gauge *same as a welding regulator*.
Like I said though they aren't terribly precise because they are only intended for rough filling so in your 1101psi case, you'd set it at about 1000psi and you can walk away, then the final 101psi would have to be with you watching. You're probably at $600 for that with gauges and fittings, but it's a lot less painful than the digital control version.

Nice... I believe I have 2 of those actually. One is built into a panel, but the other hasn't been used yet. Picked up a few bank bottles and it came with a bunch of stuff. I've just been so busy haven't even looked at it all yet.