bit nervy about converting a d-d kit

Discussion in 'Carbon Dioxide (CO2)' started by fourmations, 3 Feb 2010.

  1. fourmations

    fourmations Member

    Messages:
    201
    hi all

    i know this is old hat but i've read the tutorial
    and can help noticing i could potentially blow my head off!

    heres my specific questions, if y'all dont mind!

    is it safe to assume that the reg/solenoid/needle on my d-d disposable
    set will take the the pressure of a 2kg f/e

    i have the converter/adaptor piece,
    I see on the d-d site it shows it with an o-ring included, i dont have one

    i know that the fact that d-d sell a converter
    that all should be fine, but i think they are suggesting use of a dedicated aquarium 2kg bottle,
    are these under the same sort of pressure as a f/e?

    last one, re pfte tape...
    i have read conflicting advice on whether to use it,
    do i need to pfte anything?
    the two that spring to mind are the join from the adapter to the reg
    and from the adapter to the f/e

    i dont feel i fall into the stupid category and have the where-with-all
    to do this carefully and safely

    please put me at ease,

    rgds

    4
     
  2. JazzyJeff

    JazzyJeff Member

    Messages:
    77
    Location:
    hants
    I converted too FE about 18 months ago mate, just added a converter too my old unit which took disposable bottles, I used PTFE on the thread, not had any problems !!!!!!!!!!!!!!
     
  3. chris1004

    chris1004 Member

    Messages:
    565
    Yes I think so. I,ve certainly had no trouble with my D-D set and an FE. However I'm no technically minded expert but I can tell you that a full FE has a pressure of around 60-65bar now I bet with a bit of internet trawling you'll be able to find out how much pressure those guages can withstand.

    I didn't get an 'o' ring with mine either not seen the picture. A link to the picture would be nice so I know for sure what your asking. You do need to use a flat nitrile rubber washer between the inside shoulder of the adapter and the adjoining face of the Fe thread. Discussed in detail here:-

    viewtopic.php?f=20&t=9357

    As far as I know yes.

    I used ptfe tape from the adapter-regulater only, its not needed on the adapter - FE due to the washer. Wasn't aware of any issues with using ptfe tape perhaps you could also post a link to this problem for further discussion.

    Regards, Chris.
     
  4. fourmations

    fourmations Member

    Messages:
    201
    thanks chris

    thanks for the concise answer, perfect

    regarding the washer, is this the one (from d&d site)
    i bought my adapter in the lfs and i didnt get one!

    Adaptor.jpg

    thanks for the link, they dont mention "nitrile", is this the ones?
    http://cgi.ebay.co.uk/50-Rubber-Was...mQQptZUK_Motorcycle_Parts?hash=item20af3145a4

    is it something you could pick up in homebase, b&q or a hardware?
    im in ireland and was hoping to set up tommorrow


    best rgds

    4
     
  5. chris1004

    chris1004 Member

    Messages:
    565
    Hi,

    I think the washers that you linked to are standard rubber washers and therefore unsuitable. What you need is Nitrile rubber washers there made from a different material which has different properties, I think its the same seller though just ask him I found him very helpfull. If in doubt from the link I gave you there is a link within that thread to another thread where I posted details of where I got mine from.

    I don't think you can get them easily from local hardware stores the exact right size. It does need to be Nitrile rubber as this is impervious to co2 which being acidic attacks normal rubber washers. I couldn't say exactly how critical this is though but best with pressurised systems to ere on the side of caution. Its basically the same reason why normal airline tubing is not suitable for co2 applications.

    I reckon if your stuck though a normal rubber washer would do for a day or two until you could get the right ones.

    When dealing with co2 make sure the bottle is secure at all times, if it were to fall and hit the reg then its potentially disasterous. That and an awareness that bottle dumps can occur are your two main concerns.

    Regards, Chris.
     
  6. fourmations

    fourmations Member

    Messages:
    201
    cheers chris

    i bit the bullet and did it already

    i got a nylon washer in work, a quick call to the local marine lfs
    confirmed that it's suitable and im not dead yet!

    i was just a bit iffy about the whole thing
    its interesting that the disposable bottles i have used seem to be the
    same bar as the f/e according to my dials

    the "firing" was still a bit confusing but it was okay

    my reg actually has its rating on it at 100 bar so that was okay

    as i suspected it was all very easy and no hiccups
    its just reading the phrases "red missile" and "death" had me a bit flustered!

    best regards

    4
     
  7. chris1004

    chris1004 Member

    Messages:
    565
    Hi,

    Its healthy to be respectfull of co2 canisters and there use so no worries, happy to help.

    Just a quick word of warning though I'd be very carefull equating advice as 'good' just because they work in a LFS. Seriously!!!!!

    Regards, Chris.
     
  8. fourmations

    fourmations Member

    Messages:
    201
    yeah i know, it can be hit and miss, i've overheard some shocking advice before!

    this guy is an avid marine fishkeeper too and has run co2 for years

    do you rate the nylon washer as being okay?

    thanks again

    regards

    4
     
  9. chris1004

    chris1004 Member

    Messages:
    565
    Hi,

    To be honest I don't know I've never used them. I've only been into this planted tank side of our hobby for just over a year now (thats also how long I've been using co2) and use Nitrile washers because of advice that I believe to be correct from posts I've read on this forum from people I've come to respect. I'm just regurgitating that advice really.

    The advice that LFS stores dish out freely that I was specifically aiming those comments at is the common misconception that phosphate / nutrients cause algae. Your bound to hear that one sooner or later. Its a bit of a bug bear with many on this forum.

    I've heard some terrible advice being freely given in LFStores myself, some innocently and some not so innocently. After all there in it to make a profit.

    Regards, Chris.
     

Share This Page

Facebook Page
Twitter Page
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice