New USun XB-30ol booster not boosting

[davehicks]

I need some suggestions. Just got a new booster and it's not working.

I received a new USun XB-30ol booster a couple of days ago. I needed a couple of fittings to complete installation, and I just tried to use it this morning. I am having some trouble.

Note I am replacing an older Maximator booster with the USun, so I have experience with configuration and use of a booster.
My first attempt had a 138bar 21% air scuba tank (13 liter) connected to a much smaller 5 liter tank. The drive gas is from a filtered shop compressor putting out 7bar. When everything is pressurized, the pressure in the two tanks is equalized at 138bar, I turn on the drive gas. Nothing, no action from the booster at all. No leaks are apparent either. I tried adjusting the drive gas pressure lower and higher with no result.

What's my next step? Thanks!

 

[davehicks]

I found that connecting the Supply side to a bottle with only 500psi allowed the booster to begin working, although quite slowly. At 2000psi supply pressure it will not activate. This was not the case with my Maximator booster.

Do I need to add a supply side (o2 safe) adjustable regulator with an XB-30? I did not anticipate this limitation.

 

[Snusmumrik]

I found that connecting the Supply side to a bottle with only 500psi allowed the booster to begin working, although quite slowly. At 2000psi supply pressure it will not activate. This was not the case with my Maximator booster.

As i see - on some USUN photos warning mark is placed near drive inlet stating that
"WARNING! DO NOT USE DRIVE GAS IN EXCESS OF 8,3bar AS IT MAY CAUSE DAMAGE OR PERSONAL INJURY." Presume too high drive gas pressure.

 

[davehicks]

As i see - on some USUN photos warning mark is placed near drive inlet stating that
"WARNING! DO NOT USE DRIVE GAS IN EXCESS OF 8,3bar AS IT MAY CAUSE DAMAGE OR PERSONAL INJURY." Presume too high drive gas pressure.

Nope. And Supply gas is not drive gas. The drive gas is the motive force from a shop compressor or regulator of no more than 100psi.

 

[jborg]

It sounds like a stall due to too low drive gas pressure, but of course shouldn't do that given the numbers in your post. Given it starts running when the system is at 500 psi (~35 bar) and the ratio is supposed to be about 30x, it seems like it feels your drive gas is just a little over 1 bar... Could you have a leak or other problem on the drive gas side?

Edit: you write the _supply_ side is at 500 psi to start it running, not the destination side... that makes no sense to me. Did you switch supply & demand?

 

[runsongas]

did you already adjust the relief valve setting pressure and inspect the check valve per the instructions?

 

[happy-diver]

ha ha ha ha ha well if you don't know the difference between your screws and bolts I see no hope ha ha ha ha ha

Understand the maximator is a toy

But seriously, I read all this guff about shop compressors when boosters require an astronomical amount of drive gas and no matter how good everything is it always works better with heaps of supply gas to pump fast and right

Go electric

or don't go

 

[greeniguana]

If you're keeping your compressor below 100psi, you probably don't have nearly enough drive gas.

 

[davehicks]

If you're keeping your compressor below 100psi, you probably don't have nearly enough drive gas.

I had more luck getting it to work, but their is some hesitation if the Supply and Destination bottle pressures are equalized around 2000psi.

Adjusting the drive compressor pressure up to 100psi got it going much of the time, but the motor was running non-stop and filling was quite slow.

I agree that i probably need a higher CFM compressor. My current unit is 3CFM, and i am looking at some that offer 5.4CFM at 90psi. It seems the USun XB30 is a bit hungrier than my old Maximator.

 

[greeniguana]

See:

I

Thread 'USUN XB30 Drive with "Shop" air?'

Jan 5, 2024

I've got a USUN XB30 for booting 2L and AL40's. I can't seem to find the CFM requirements for drive gas. Just the 8.3Bar max input pressure. This is easily done using a regular "shop" air compressor. Anyone have a setup like this? What compressor do you use and what kind of pre-filter do you have in place? Would a little pancake compressor keep up? Trying to minimize trips to the dive shop for drive gas if possible as I have an H bottle of O2 I'm filling from.

Thanks

• InWay2Deep
• Replies: 3
• Forum: Compressors, Boosters & Blending Systems