Keeping propane tanks warm!

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arthur5005
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Keeping propane tanks warm!

Postby arthur5005 » Tue May 06, 2014 4:11 pm

Was wondering if anyone had any experience with powered blankets for keeping propane cylinders warm on flame effect rigs:
http://www.powerblanket.com/gas-cylinder-heaters/
Not keen on keeping my cylinders in a water bath.

Any other suggestions welcome. :)

Arthur
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Molotov
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Re: Keeping propane tanks warm!

Postby Molotov » Tue May 06, 2014 4:40 pm

They are UL listed for this purpose. Of course, discussion of the use of the heating blankets should take place with the Fire Art Safety Team (FAST) and/or Performance Safety Team prior to spending a lot of money on something you can't use.

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Re: Keeping propane tanks warm!

Postby oscillator » Tue May 06, 2014 5:58 pm

Gah! You have to register just to see the specs PDF. No bueno.

Anyhoo, I am in the same boat - wanted to see what the current draw was on these blankies.

Right now I am pondering the use of fans & ducts to point engine heat towards the cylinders.

Be great if the experts could chime in here....

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Re: Keeping propane tanks warm!

Postby Jackass » Tue May 06, 2014 6:33 pm

I've seen them keep the cylinders in a hot water bath, water is either warmed using a heat transfer from engine coolant or electric hot water heater running on battery and/or genni power. I believe the later is the case with El Pulpo, which I had the chance to examine last year during the day when there's less blurry magic going on.
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Re: Keeping propane tanks warm!

Postby oscillator » Tue May 06, 2014 8:11 pm

Gotta love that Blurry Magic.

A bit of a diversion here, but this is Sue & Max's Fire Ring @ Ill Ville 2013.

Clever setup: fire ring with built-in coolant. The water circulated to keep the ring cool and to a ~400 gal Livestock Tank in which the cylinders were immersed - that also keep the cylinders warm. I have no idea how they got that much water out there.

The Ring ran all night until sunrise, then you could pull the empty tanks & jump into the bath which, at that point, was a hot tub.

Oh, there were some exquisite fire performances too. Yay Max & Sue!

SuesRingofFire.jpg
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Re: Keeping propane tanks warm!

Postby trilobyte » Thu May 08, 2014 1:27 pm

If you're in a zero or very low experience with handling propane for flame effects... recruit an expert to join your team or look into taking some kind of class (some major cities have maker spaces that offer them).

Go here for more information on fire art, direct your questions to the email addresses provided on those pages.

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Re: Keeping propane tanks warm!

Postby A-RockLeFrench » Thu May 08, 2014 6:56 pm

I have heard of people using regular old electric blankets wrapped around tanks. Never seen it though, can't vouch for its effectiveness.

Why are you opposed to the water bath? Its effective, safe, fairly simple/cheap to execute and playa-proven...

Just curious, that's all.
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Re: Keeping propane tanks warm!

Postby A-RockLeFrench » Thu Jul 28, 2016 1:25 pm

So..... Electric blankets?

Now that we're building FE for the Bonerpillar I'm pondering the same question I asked 2 years ago. Why would one not want to use a water bath? On a MV? I don't want to have to reroute coolant lines, tear out the heater and fuck with hot water slashing around, so we are seriously considering electric blankets.

thinking about this

Removing flannel/cloth covering and wrapping around the tank and covering with a layer of that foil bubble insulation. I'd throw an outlet thermostat in there set to shut off at 200 or so if for any reason the blankets get hotter than they say they should. All home heating blankets are supposedly engineered not to get hotter than 176, the max temp set by the UL.

Anyone have any thoughts?
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Re: Keeping propane tanks warm!

Postby Jackass » Thu Jul 28, 2016 2:05 pm

I think electric blankets may be able to work on smaller/ less frequent discharges, but for the larger accumulators or more frequent dumps you'll need more contact area such as water. Most of the propane big-boys use water.

My camps MV uses a blanket, but we only have 2 20# cylinders (at a time) for supply and 2 10# accumulators. If you pop them off too frequent it starts to freeze and get weak, when the cylinders get down to the last 20-30% the flame effect again gets weak and you have to switch out...
Sooner or later, it will get real strange...

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Re: Keeping propane tanks warm!

Postby Token » Thu Jul 28, 2016 4:25 pm

KISS principle.

Keg bucket with H2O. Or bigger if needed.

Proven.

If you are really blasting the stuff out, you gotta have either allot of water or heat the water.

For mobile deployment, wrapping a metal tube coil around the exhaust header and plumbing to water tank is effective and simple. Think anti-kegerator.

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Re: Keeping propane tanks warm!

Postby Jackass » Thu Jul 28, 2016 5:03 pm

I was thinking copper tubing coil off both engine heater hoses, use engine coolant temperature. Think copper coil heater core... Exhaust manifold would do the same trick, but would need a additional pump.
Sooner or later, it will get real strange...

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Re: Keeping propane tanks warm!

Postby Token » Thu Jul 28, 2016 9:26 pm

Jackass wrote:I was thinking copper tubing coil off both engine heater hoses, use engine coolant temperature. Think copper coil heater core... Exhaust manifold would do the same trick, but would need a additional pump.


Why a pump? Coil and fluid with thermal gradient = pump. Hot water will rise.

Lots of us country bumpkins have wood fired hot tubs with this type of gizmo. No moving parts.

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Re: Keeping propane tanks warm!

Postby A-RockLeFrench » Thu Jul 28, 2016 10:20 pm

Exhaust manifold is way hotter than coolant temp, right?

The tank location is significantly further from the ex manifold than the heater/coolant lines. One of the reasons we chose that spot, in case we did go with plumbing over electric.

I've seen people with 100 lb cylinders in water baths and as the fuel is used and it gets lighter the cylinder start to 'float' around. I bet this could be solved with ratchet straps..
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Re: Keeping propane tanks warm!

Postby Ulisse » Fri Jul 29, 2016 12:27 am

A-RockLeFrench wrote:Exhaust manifold is way hotter than coolant temp, right?

The tank location is significantly further from the ex manifold than the heater/coolant lines. One of the reasons we chose that spot, in case we did go with plumbing over electric.
.


The trick will be transferring a large quantity of heat from the exhaust manifold to the circulated coolant. The engine block is already surrounded by coolant why not use that?
It sounds like you have a water cooled engine and probably somewhere to attach a standard car heater. If you disconnect the heater and circulate the coolant through a copper tube submerged in water around the tank you will have better heat transfer. If you need more heat to your propane tanks you could put a valve (not a ball valve) in the radiator circuit. Just watch your coolant temperature.
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Re: Keeping propane tanks warm!

Postby Token » Fri Jul 29, 2016 7:48 am

Basically we are arguing finesse at this point.

All will work.

Doesn't need to be on manifold, can be anywhere on exhaust line.

Coolant method is fine too, stable temperature.

Exhaust method possibly higher temp but much lower circulation. Also less thermal mass compared to engine coolant.

Straps, bungees, rope ... Yes can strap it in if you like. Not needed really unles you like neat.

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Re: Keeping propane tanks warm!

Postby Jackass » Fri Jul 29, 2016 10:22 am

I'd put a ball valve on the incoming coolant hose, and a easily readable dial thermometer in the tank bath water in order to regulate the temperature. I don't think you would want the bath to reach 180-220 degrees like the engine coolant, but 120-130 degree water would probably do the trick without burning anybody. Safety third.
Sooner or later, it will get real strange...

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Re: Keeping propane tanks warm!

Postby GreyCoyote » Fri Jul 29, 2016 7:32 pm

Just a point: you really dont want high temps in the water around a propane bottle. You are just trying to counteract the cooling effect as the propane boils to vapor, not heat the bottle to 200f. High temps bring a whole nuther set of problems, none of them safe.

A good propane system relies on a large thermal mass at relatively low temp adding a large flux of low-temp heat, not a small mass at a high temp.

Take a look at the vapor pressure vs temp curve for propane and you will see that a lot of heat beyond a "warm" tempersture isnt needed if you are moving enough mass.
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Re: Keeping propane tanks warm!

Postby A-RockLeFrench » Sat Jul 30, 2016 1:06 am

Good input you guys. Thanks!

Still not sold on the water bath. Unfortunately there's really no way to test the blankets until we are in the field.. But if most everyone else uses water there must be reasons.. I'll talk it over with the FE guy..
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Re: Keeping propane tanks warm!

Postby Admiral Fukkit » Sat Jul 30, 2016 6:38 am

I don't have a whole lot of experience with flame effects but a lot with vehicles and fabrication of stuff.

I think the water is a better idea. Surrounding the bottles in water will be a more effective way to conduct heat and you already have a source of hot water.
The plumbing is super easy, just use the 3/4 inch heater hoses from your engine; get longer ones and run them to some copper tubing coiled up in the water cans as mentioned.
If you do this, remember to top off your bus radiator, you'll need more coolant. Temperature control would be the tricky part, it could be as simple as using a ballcock valve (there needs to be at least one clearly labeled ballcock valve on the Bonerpillar) and opening it just enough to get the water warm by trial and error. You'd have to manually babysit the water temp.
I think I'd just drop a floating hot-tub thermometer in the water to gauge it.
The Bonerpillar should have at least one hot-tub part too...
It could be automated using thermal switches and an electric solenoid valve but I don't think I'd bother with that.

I'd recommend putting shut-off valves in both heater hoses right near the motor so you can shut the whole system down as a fail-safe to keep your engine from losing its coolant in the event of a failure or leak of some kind.


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