Propane Tanks for storage - Questions

antos_ketcham Posted By antos_ketcham, Apr 10, 2008 at 9:59 PM

Thread Status:
Not open for further replies.
  1. antos_ketcham

    antos_ketcham
    Member 2.
    NULL
    

    Mar 5, 2008
    155
    0
    So here are the questions -

    Can propane tanks be used as storage outdoors (w/glycol) and can they be used as part of an open system?

    Pete
     
  2. Nofossil

    Nofossil
    Moderator Emeritus 2.
    NULL
    

    Oct 4, 2007
    3,556
    60
    Loc:
    Addison County, Vermont
    I have no actual knowledge, but that hasn't stopped me yet....

    First, if they're outdoors you will have to insulate then very well. In that case, glycol wouldn't be necessary. Good thing, since that much glycol would be pretty expensive. I figured out that I could go all winter without adding heat to my outside storage and it still wouldn't freeze.

    Second, propane tanks are steel. I assume that means that they'll rust if exposed to oxygen-bearing water. Open systems provide a continual supply of fresh oxygen. My system is open, but the tank is stainless (half a milk bulk tank). The 'open' water stays in the tank and does not circulate.
     
  3. jebatty

    jebatty
    Minister of Fire 2.
    NULL
    

    Jan 1, 2008
    5,259
    674
    Loc:
    Northern MN
    Ditto on the outdoors - a 50/50 glycol mix on a large quantity of storage would be unreasonably expensive. Open system would work, but would have to use appropriate boiler chemical to scavenge oxygen and be sure to balance PH (8-9 or so). You might consider an open/very low pressure like some of the OWB's that use a weighted vent to limit air access, results in 2-3 psi or so. I think most OWB's are open systems and they seem to last reasonably well. Also consider a filter screen to block any crud, I think 100 micron should be OK. Leave sufficient space in the tank for expansion.
     
  4. solarguy

    solarguy
    New Member 2.
    NULL
    

    Jan 14, 2008
    147
    0
    Loc:
    southern, nh
    If you're going to put your tank outside you can get away w/ a 30% glycol solution that will offer freeze protection to 0, burst protection to -20. Under the most severe winter conditions, when you stop circulating the water/glycol loop, the glycol mixture just turns to slush, usually will not freeze solid. If you're doing an outside tank most cases you're circulating continously.

    The thing about glycol is it requires more energy to heat the water & transfer it's thermal energy so the less glycol the better.
     
  5. antos_ketcham

    antos_ketcham
    Member 2.
    NULL
    

    Mar 5, 2008
    155
    0
    Anyone know a source for propane tanks and coils to go in them?

    Pete
     
  6. GARYL

    GARYL
    New Member 2.
    NULL
    

    Apr 4, 2008
    40
    0
    Loc:
    Adirondack foothills near Saratoga Springs
    Saw a 1000 gallon one on Craigs list a few weeks ago for $500. You would have had to go to Syracuse, NY to get it. Usually I see that you can expect top pay about $1 per gallon. The coils can be made and there are many,many threads on this site that will show how others have done it.
    Good luck Pete.
    Gary
     
  7. jebatty

    jebatty
    Minister of Fire 2.
    NULL
    

    Jan 1, 2008
    5,259
    674
    Loc:
    Northern MN
    Skip the coil and go with a plate hx.
     
Thread Status:
Not open for further replies.

Share This Page