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Fire Extinguisher Co2

Discussion in 'Archived PARC threads' started by Themuleous, Sep 10, 2007.

  1. Themuleous

    Themuleous Member

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    DO THIS AT YOUR OWN RISK. I accept no responsibility for any loss, damage or injury suffered if you follow this 'manual' and something goes wrong, that's YOUR fault not mine.

    Hi all :)

    Before I start a BIG word re safely, these cylinders (read the other posts) are potential killers, but if you are sensible and treat it with respect you shouldn't have anything to worry about.

    There have been several threads recently about pressurised CO2, so I thought as I was setting up a new system I would show everyone how to do it cheaply using a fire extinguisher. So first you need a cylinder, these do vary in size but this 2kg cylinder is 23" tall (that is a DVD case next to it) and I got it on eBay for £22 including delivery from here

    <a href="http://search.ebay.co.uk/_W0QQsassZ123safer4u" target="_blank">http://search.ebay.co.uk/_W0QQsassZ123safer4u</a>

    [​IMG]

    Then you need a reg, again I got mine on eBay, you can spend as much as you like on a reg but these are cheap and I've found them to be excellent, with a very easy needle value built in.

    <a href="http://stores.ebay.co.uk/Aquarianerversand...sQ3amesstQQtZkm" target="_blank">http://stores.ebay.co.uk/Aquarianerversand...sQ3amesstQQtZkm</a>

    [​IMG]

    You'll need to remove the horn, which was easier to do than I had expected, just use a variable wrench. On a safety note it's a good idea to keep the safety pin in to prevent the lever from accidentally being squeezed whilst the horn is removed. Once the regulator is safely attached then remove the pin. If the extinguisher were to accidentally go off without the horn attached it can do a fair bit of harm as liquid CO2 comes out very fast. (Thanks James)

    [​IMG]

    [​IMG]

    [​IMG]

    The reg didn't actually fit quite as snug as I had expected however its working find so no problems :) and this might be the same with all regs and cylinders to ensure a secure fit.

    [​IMG]

    Tighten it well with the wrench, as if you don't it could cause you problems when you 'fire' the FE and we don't want people getting hurt now do we!

    [​IMG]

    [​IMG]

    Now take it outside in order to 'fire' the FE to release the CO2. I was expecting an explosion or something when I did this, but I had tightened the reg nut well and a short hiss was all I got, good actually I don't want to lose my arms! The needle on the reg should go to around 50 bar and the other gauge is set using the larger black dial on the front of the reg. I don't think it really matters what you set this to, I just went for 1.5 bar for no reason at all!

    [​IMG]

    You'll need to keep the handles closed to keep the CO2 flowing, I used gaffa tape.

    [​IMG]

    Next check for leaks using soapy water

    [​IMG]

    Now link it up to a bubble counter with check value to protect the reg from back flow.

    [​IMG]

    The attach a diffuser. I'm a hugh fan of ceramic glass diffusers as they look the business and work a treat and really aren't that expensive. I love eBay and got mine from here

    http://stores.ebay.co.uk/AquaticMagic_W0QQ...sQ3amesstQQtZkm

    [​IMG]

    And some CO2 tubing

    http://www.aquaessentials.co.uk/index.php?...9qnjl48lsia52s7

    Then set the bubble rate and add to the tank :)

    [​IMG]

    [​IMG]

    Once install, be sure to secure the cylinder carefully, either by chaining it to the wall or similar, anything to stop it being knocked over. In the words of James, if the reg gets knocked off the cylinder could take off, through the roof by the sounds on things! Better to be safe :)

    This whole kit cost we around £70-75 quid and should last at least a year before I need a refill.

    Hope that's of help to people

    Sam
     
  2. DevUK

    DevUK UKAPS member

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    Sam, you are the best! As you know, this is the same system I'm going with, after your very helpful advice (along with everyone else!) I have the fire extinguisher ready to go, need to order the regulator/needle valve now. Might wait till after pay day as funds are short.

    +1 for sticky vote! :)
     
  3. mlawson

    mlawson Excessum ut clementia

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    Well, I just ordered a whole pressurised system anyway, but I'm sure this is very useful to a lot of people so I also think it should be pinned.
     
  4. JamesC

    JamesC Member

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    Nice one Sam. On a safety note it's a good idea to keep the safety pin in to prevent the lever from accidently being squeezed whilst the horn is removed. Once the regulator is safely attached then remove the pin. If the extinguisher were to accidently go off without the horn attached it can do a fair bit of harm as liquid CO2 comes out very fast.

    James
     
  5. dane261

    dane261 Member

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    mes getting a co2 kit hahahahahaha


    thanks for the idea

    dane
     
  6. Themuleous

    Themuleous Member

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    Thanks guys :)

    Good point James, Ive edited it to include your suggestion.

    Sam
     
  7. blue acara

    blue acara Fish Herder

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    Good post sam. When I was first thinking about pressurized co2 this post would have been very helpful.
    pressurized co2 for cheap, if /when I set another tank ill give that regulator a try.

    I also use co2 from the ebay company you have linked- a 5kg bottle. good price/product and fast delivery.
     
  8. zig

    zig z is z

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    Nice guide Sam

    I think the working pressure should always be around 1 1/2 - 2 bar for a nice safe level with a good bit of leeway either side of too high and too low, so you have it set right as it is now, any lower and the working pressure is too low, the output bubble rate gets erratic if at 1 bar or lower.

    Temperature will also play a role in the working pressure and affect your bubble rate output so beware setting up a new cylinder brought in from the cold outside, better to let it reach room temperature so keep a good eye on the bubble rate until it does.

    But nice guide for those yet to take the plunge into pressurised CO2.
     
  9. Rob.S

    Rob.S Member

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    Very useful guide.

    Do you not use a night shut off solenoid Sam?
     
  10. DevUK

    DevUK UKAPS member

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    Not any more, he's about to sell it to me! :shifty:
     
  11. Rob.S

    Rob.S Member

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    :lol: I wonder if he knows that :huh:

    So Sam will be running 24 hr co2 then?
     
  12. gowing238

    gowing238 Member

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    Sorry to spoil the party people. This may be a cheap way to make a CO2 system but it is EXTREMELY DANGEROUS!!!!!!. I am a service engineer for a company that makes high pressured lifting devies for the emergency services. Whilst you are fiddling about with a cylinder with 50BAR of c02 that is ready to come gushing out with one wrong move you are dicing with death. Just an example for you to understand how much 50bar of pressure is 2 years ago a fireman was killed when a breathing apparatus cylinder regulator came loose. This cylinder was 18Bar and was 5 feet from where he was standing and it blew half his face off. So imagine 50bar when your loosening with a spanner. It would like be sitting on a plane when a bomb went off.

    My last word on this is DONT DICE WITH DEATH. High pressure cylinders should not be messed around with by unqualified people. :rip:
     
  13. Themuleous

    Themuleous Member

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    He does know that ;) and yeh I run it 24/7, no problems at all :)


    Fair point. You can buy 500g JBL CO2 cylinders from a fair few local fish shops, they run at 50bar. Would this also include welding people?

    Sam
     
  14. Dave Spencer

    Dave Spencer Gort! Klaatu barada nikto.

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    What constitutes messing about with them, and what qualifications do we need?

    Dave.
     
  15. Davver

    Davver Member

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    Great post Sam! I've been using this system for a year or so and it works brilliantly... I use cable ties to hold my handles together as gaffer tape will probably give way at some point...


    As for messing about....... 'And there it was, gone!'

    Dave.
     

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