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Magpie
lab constructor
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Mood: Chemistry: the subtle science.
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I bought a 3/4" head like you show for$56.
The single most important condition for a successful synthesis is good mixing - Nicodem
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XeonTheMGPony
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High volume low velocity hope fully if cheap to recharge fire it off to get a feel for it, set up plates of bicarb around it to find the ideal height
to not disperse the powder.
Or like I say use the hood to deflect and diffuse the co2 stream.
Can't wait to hear of the results, I love CO2 and Halon systems.
[Edited on 9-8-2017 by XeonTheMGPony]
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
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Mood: Chemistry: the subtle science.
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My CO2 deluge fire extinguisher for my hood has been revised to provide pressure let-down. The let down device is shown in this picture.
I tested the system with a burning mix of methyl borate and alcohol. It work well as shown here:
https://youtu.be/14EDZCsRP74
I did not use the $56 distributor nozzle as my injection point is into the 8" diameter hood duct.
If you have any questions, comments, or suggestions, please provide them.
[Edited on 13-8-2017 by Magpie]
[Edited on 13-8-2017 by Magpie]
The single most important condition for a successful synthesis is good mixing - Nicodem
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j_sum1
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Looks pretty cool Magpie. How much better does it go with the sash down?
As an aside, you now have seven subscribers to your channel.
J.
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Magpie
lab constructor
Posts: 5939
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Thanks j_sum.
Putting the sash down somewhat would have helped I think. But with my system CO2 is also rushing out the 8" duct to outside the house, and over the
sash top.
I'm not sure if the black surge bottle is needed. The main improvement is the Schrader valve at the top of the black bottle. Using steel parts vs
the former CPVC helps also, which was glued at the point of failure with silicone..
I will be testing with some progressively larger fires.
Thanks for your interest in my YouTube channel (Mr Ardipithicus).
The single most important condition for a successful synthesis is good mixing - Nicodem
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XeonTheMGPony
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That looks great now and should serve you well!
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
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Mood: Chemistry: the subtle science.
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Today I installed my fire blanket, a wool army surplus green blanket.
It is held in place with a little thread that will break away when the blanket is tugged off the towel rack.
The single most important condition for a successful synthesis is good mixing - Nicodem
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
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Mood: Chemistry: the subtle science.
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Here's a video showing my fire blanket (army surplus wool):
https://youtu.be/FEt5_XrNyJk
The single most important condition for a successful synthesis is good mixing - Nicodem
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Magpie
lab constructor
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During the last test of my CO2 fire suppression system the alcohol fire was not extinguished. I attributed this to the fact that too much oxygen was
coming into the hood through the open face (25" x 48"). Therefore I bought a custom Venetian blind from Home Depot and installed it. When a fire
occurs this blind is immediately dropped to cut off the air flow into the hood.
Here's a video of the test of this new feature:
https://youtu.be/kkJ1CmiWMA8
Relevant but wrong video:
https://youtu.be/oVZv3B3ZGjg
I will post correct one soon.
[Edited on 14-9-2017 by Magpie]
[Edited on 14-9-2017 by Magpie]
[Edited on 14-9-2017 by Magpie]
The single most important condition for a successful synthesis is good mixing - Nicodem
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XeonTheMGPony
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Ya CO2 is a oxygen exclusion system, ie it works by excluding air to the fire, most automated systems will shut off the fans and close fire dampeners
to ensure the room is flooded to sufficient concentration.
Halon and the newer halotron 1 series work by excluding o2 and chemically interfering with the fire to kill it thus 6% amount of total room volume
will snuff out the fire.
Any gas based system should do 2 things automatically shut down the fan and close fire dampeners.
You could do this with some solenoids and a push button and a timer.
Hit the button instantly shuts off the fan and releases the dampeners, 5 second delay it fires the CO2
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Magpie
lab constructor
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Actually shutting down the fan on the way out the door would be easy for me.
Incidentally the Venetian blind was not damaged in the test, but the explosive force of the CO2 shocked my son and me. CO2 was just rolling out the
top over the sash. I'm going to test a bigger fire tomorrow using three plates of alcohol. This should give a very hot fire.
In the fire blanket video you can see another safety upgrade. I placed all my solvent products (a few ml each) and day use solvents in the metal
vented school locker. This doesn't have all the features of the commercial yelllow solvent cabinets but should go a long way in satisfying any OSHA
or fire code safety inspectors.
Now I just need hazards symbols and MSDSs.
[Edited on 15-9-2017 by Magpie]
The single most important condition for a successful synthesis is good mixing - Nicodem
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Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
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Mood: Chemistry: the subtle science.
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In a related note the Crosby, TX chemical plant fire could no be put out with any available suppressants. The chemicals were organic peroxides which
were, I presume, supplying their own oxygen due to decomposition due to heat.
The single most important condition for a successful synthesis is good mixing - Nicodem
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XeonTheMGPony
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There are some things that it is better to run and find cover and wait it out, then to stick around and try the impossible or tempt fate!
Prevention is all ways the best out of any of them though, don't have to deal with any thing when it doesn't happen to begin with!
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