[TheForge] [OT] Pyro-boom (Re: Thanks for the info...)
Paul Hewitt
[email protected]
Mon Jun 2 10:51:06 2003
That can be arranged, we have plenty of cannons.
I more of less was just making the point that unless a propane tank is full
of liquid, its relatively safe to finish burning off the residual gas and
recycle it. Propane tanks come in all sorts and sizes, I have some of them
we have even used for prototype rocket engines as the combustion chamber,
although because they're steel and turn red hot they have a limited lifespan
before developing a hole and "flaming out"
http://www.bograt.com/misc%20graphics/Pulsejets/
There are some pics of one operating.
While tanks are dangerous good safety practices will prevent accidents.
We have even cut open an Aceyt tank on the bandsaw (Was out of hydro and
mostly rusted out) we let it stand for about 2 weeks without a valve, and
put it in the bandsaw in the middle of the parking lot and let it hack away.
Needless to say we are all still here.
No fine MIST and no Big Kablooey
Paul
----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Monday, June 02, 2003 4:50 AM
Subject: Re: [TheForge] [OT] Pyro-boom (Re: Thanks for the info...)
> Hey Paul!
>
> Maybe you would like to "touch off" the next Abana conf?....well maybe
not...never mind...you know...
>
> Bob S.
> ______
>
> >While O/A has an awesome power to exceed the sound barrier making small
> >sonic booms, I am failed to be impressed by the percussive powers. For a
> >small experiment about 8 years ago, we made a "blast container" I own a
> >propane tank disposal buisness, so we are always coming by 1000 gallon
tanks
> >that are damaged or out of service that must be burned down. We cut one
to
> >about 8 feet long, and buried the bottom 4' in the ground. We then set
up a
> >20# (5 US GAL) propane tank with a 3/4 plug instead of a valve, and a
> >detonator mounted in the plug. We filed the tank with a perfect mixture
> >then plugged it and placed it in the bottom of the tank, and set it off.
> >Much to our dismay it went PING, and then proceeded to suck air back into
> >the container as the burnt O/A takes up less space creating a vacuum and
> >sucking the small wire back into the container from the detonator through
> >the epoxy. We devalve about 500 to 1000 tanks a day, and typically then
> >cut holes in them. The guys with torches usually pride themselves on the
> >tanks that become "jet engines" when a tank sits open long enough they
get
> >a perfect mixture and then will burn inside the tanks emitting the hot
> >exhaust gasses out the hole that's been cut. After about a 2 to 3 second
> >interval they burn out, but do not explode the tank.
> >
> >After the first dismal failure at turning a tank into shrap inside the
blast
> >container, we decided to see exactly what it would take. and open top
tank
> >was filled with O/A and touched off without a plug, still no shrap, just
a
> >ping and a whoosh as the air returned into the vacuum of the container.
> >The guys finally settled on black powder. Lets just say at about 500
grams
> >they finally succeeded in splitting a tank at the weld line.
> >
> >Aceyt will not burn back into the tank the regulator is a one way out
valve
> >even high back pressure will result in nothing more than the regulator
will
> >back bleed the pressure due to the set imbalance of the spring. This can
> >result in a fire. Because Aceyt will rapidly decompose without oxygen,
it
> >is possible to create a section of hose that will explode, although its
not
> >nearly as spectacular as if it has an good oxygen mixture. Forcing O2
back
> >into the hose will not mix the gas correctly, but will result in a high
> >pressure forcing the Aceyt to "mechanically decompose" the Aceyt
chemical
> >structure is really quite unstable as we already know and will split into
> >smaller less flammable chains of hydrocarbons.
> >
> >As for some jokes with a sack full in the back of the truck that's a damn
> >good way to get a head full of glass, I can just imagine tempered window
> >squares flying at 24000
> >FPS...................................................
> >
> >I heave read article in the paper where some idiots where carrying about
30
> >balloons inside a minivan, rolling around on the carpet, of course one
going
> >off will set them all off, the windows were all blown out of the van, and
> >both idiots lost their hearing... Geeze I wonder why?
> >
> >They had been stuffing them in mail boxes, with pull type firecrackers
> >attached. Luckily no one opened any of the mailboxes before authorities
got
> >to them. By the time the van exploded they had placed 70 some balloons
in
> >mailboxes. Can anyone imagine a Ford Aerostar full of O/A balloons going
> >up???? At least a hundred? I mean I know what 50 can
> >do.......................
> >
> >
> >
> >
> >
> >
> >----- Original Message -----
> >From: "Blacksmith" <[email protected]>
> >To: <[email protected]>
> >Sent: Saturday, May 31, 2003 6:42 AM
> >Subject: Re: [TheForge] [OT] Pyro-boom (Re: Thanks for the info...)
> >
> >
> >> A couple of years ago 2 guys in Toledo were going somewhere with a
> >> garbage bag
> >> of oxy/act in the back of the pickup truck. I don't think their
> >> intententions were ever
> >> discovered. In any event they never made it to wherever they were going
> >> before the
> >> bag exploded. Darn near destroyed the truck. They escaped with their
lives
> >> fortunately.
> >>
> >> Bob Willman
> >> The Eagle's Anvil
> >> Bowling Green, Ohio
> >> WB8NQW
> >>
> >> ----- Original Message -----
> >> From: "Mike Spencer" <[email protected]>
> >> To: <[email protected]>
> >> Sent: Friday, May 30, 2003 23:46
> >> Subject: [TheForge] [OT] Pyro-boom (Re: Thanks for the info...)
> >>
> >>
> >> >
> >> > Pyro Boy quoth:
> >> >
> >> > > Imagine a 150' long piece of 5 mil anitstatic plastic bag roll (we
> >> > > make smaller bags from the large roll of tube with a heat sealer)
Then
> >> > > imagine some idiot and all his buddies, and 3 full 235 CF sets of
> >> > > oxy/acet tanks, and a mixing valve preset to the perfect
> >> > > mix...........
> >> >
> >> > Um, have you *done* this? Why didn' I hear?
> >> >
> >> > "Antistatic plastic", eh?
> >> >
> >> > I once touched off a small party balloon full of no particular ratio
> >> > of oxy/acet with a 4' piece of rod heated one end. Exceeded
> >> > expectations by an order of magnitude. Rattled distant
> >> > windows. Deafened me for awhile. Before trying a second one, I got
to
> >> > thinking about static electricity. Hmm.... I have 9.8 fingers,
> >> > decided to keep it that way.
> >> >
> >> > Is there a way to guarantee that a party baloon will remain
> >> > static-free for a predictable period of time?
> >> >
> >> > I've also thought, in my more irritated moments, that a clear trash
> >> > bag, filled with oxy/acet, with a peeled flash bulb inside, hung high
> >> > in the old apple tree by the road and connected to the house with
some
> >> > lamp cord would offer a remarkable surprise to the deer jackers who,
> >> > in the dark of an autumn night, check the tree for deer nibbling the
> >> > drops. And then I thought, "Do I need deaf, blind, frightened, armed
> >> > drunks staggering around in my pasture?"
> >> >
> >> > - Mike
> >> >
> >> > --
> >> > Michael Spencer Nova Scotia, Canada
> >> >
> >> > [email protected]
> >> > http://home.tallships.ca/mspencer/
> >> >
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> >> >
> >>
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