That test showed how much a sealed barrel could take. The air cannot escape. A barrel full of SH has a hole with a hose to let the liquid escape. The pressure won’t build the same because of the displacing liquid exiting the barrel and air taking its place. I think that’s what he is saying. So I wonder how much pressure a barrel with displacing liquid squiring out of it due to the pressure could take. Will the barrel pressure build faster than the liquid can escape causing it to explode ? Or will the liquid squirt out faster then the pressure can build until eventually the liquid is gone and air is just blowing out of it ?
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Depending on the air compressor you can definitely pump in air a lot faster than what the liquid can escape. Looks like I’ll have to do two tests just to verify. 
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That depends on the size of the outlet, it’s the air above the liquid that pressurises and grenades when the outlet bottle necks at a quicker rate.
yep, that is what I was saying.
yeah, that is why I wouldn’t use 1/2" hose here. I’m thinking if it is like some of the rotary ones I used in the past, 3/4 to 1", my last I threw 1.5" on there with a ball valve by the fill up. THen just drained back to fuel storage tank. THis was diesel fuel. You can crank the snot out of rotary and it creates lots of pressure.
sorry didn’t reply sooner, I went and tilled my garden, cut some grass, trimmed some trees, etc, you know, all the stuff that will make me a better PW 
@Infinity Just want to say thank you for the inspiration and the parts list. Knocked this out in a little over an hour this afternoon. The flow is amazing and it did not need a great deal of air pressure. I had to alter the plans and used 1" PVC instead of 3/4" because the hardware store didn’t have everything in 3/4". Thank you again.
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That’s awesome! So happy to see my posts were helpful.
You’ll probably get a little better flow with the 1” plumbing 
Wait until a regulator malfunctions with a full drum of bleach …
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Hey, I never claimed this was the safest method for transfer. 
A redundant inline regulator and a preset pressure pop-off valve would both be good safeguards to have in place.
Jeez you guys are brave!, ide need a full Kevlar hazmat suit.
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Ditto, I spray HF all day ,And I thought I was brave.
It’s ok, you can say what you were really thinking…
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So how big an air compressor would that require?
I don’t know but I’m going to find out if a pump that puts out 22 cfm’s with an 80 gallon tank will do it.
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Dangerous? Doesn’t everyone transfer SH in one of these?
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Do what, exactly? Send it sky-high in thirty seconds?
Make sure and plumb your tank with 1” pipe and hose. Might as well make good use of all that air power.
In retrospect, I kinda wish I did mine with 1” pipe and crushproof hose. I’m betting my buddy’s shop compressor could’ve given me a few more gpm with larger plumbing. But I’ve only got a 20 gallon chem tank, so there’s a matter of diminishing returns: does it really matter that much if I can fill the tank in 1.5 minutes instead of 3?
@Sasquatch any air compressor should do. The bigger the compressor and plumbing, the better the flow rate.
Last year, when I was using the 5 gallon carboys, I built a mini air displacement system powered by my battery operated Ryobi compressor. That gave me around 2 gpm, which I was happy with, since it was about 4 times faster than using a siphon pump.
I don’t think that little compressor would be up to the challenge with the additional volume and head-pressure in a full size drum. But I’m guessing a little pancake compressor would be up for giving you a few gpm out of a drum. You only need to hold a pressure between 10-20 psi, and move a few cfm of air.
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Thanks Infinity. That’s what I was guessing. I’ll give it a go and we’ll know for sure! 
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I hear you, but if the regulator on my compressor goes, I am more worried about that thing blowing than the SH. Have an 60 or 80 gal vertical compressor (can’t remember how much without looking).
I actually have two regulators on it, one on the compressor, and one down the line by the driers.
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First test.
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