Date: Wed Sep 26 11:21:08 2007

Author: Douglas Johnson

Subject: Re: fire extinguisher cart

Post:

Has anyone ever used or seen used a SCUBA tank of compressed air to
propel a cart, in place of using the CO2? Just curious.... I
imagine it wouldn't work as well but might be easier to refill and
store.

....Doug J.


>I purchased a SCUBA tank because UC Santa Cruz teaches that * and
>filled the tank free. Then I found the fire dept would also w/ air
>(SCBA). Maybe CO2 also, but should be considerably more expensive,
>I've forgotten.
>
>I think the old H2SO4 + baking soda in water type would work even
>better EXCEPT unacceptably messy. No need to modify the hose and
>nozzle, either.
>
>
>* Initially I borrowed the tank to verify it'd work well.
>
>bc, thinks CO2 would make a poor wielding gas, also thinks filling
>tanks w/ a different gas is illegal.
>David Tam wrote:
>
>>Wayne,
>>
>>Wait, aren't those connected in series, i.e. cylinder, tube,
>>diffusing horn? Or did I not understand your terminology?
>>
>>Also, couldn't I also use a pressurized cylinder of CO2, such as
>>those for welding?
>>
>>Thanks,
>>
>>David
>>
>>On 9/25/07, Wayne Easterling
>> wrote:
>>
>>Hi David,
>>
>> What you see is not steam, but water vapor condensing
>>out of the air because of the low temperature of the CO2 being
>>expelled. To do this demo you need to modify a CO2 type fire
>>extinguisher by first removing the discharge tube/horn and then
>>cutting off the diffuser.
>>
>>
>>
>>Wayne
>>
>>
>>From: tap-l-owner@lists.ncsu.edu
>>[mailto:
>>tap-l-owner@lists.ncsu.edu] On Behalf Of David Tam
>>Sent: Tuesday, September 25, 2007 12:37 PM
>>To: tap-l@lists.ncsu.edu
>>Subject: [tap-l] fire extinguisher cart
>>
>>
>>
>>Hi everyone,
>>
>>I'm stumped as regards the demo where a person sits on a cart and a
>>fire extinguisher propels him/her. What did you do to the fire
>>extinguisher to make it propel a jet of steam? Mine either puff a
>>cloud of powder or shoot a focused stream of water.
>>
>>Thanks,
>>
>>David Tam


From tap-l-owner@lists.ncsu.edu Wed Sep 26 11:21:08 2007
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