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  1. #11
    Join Date
    Dec 2012
    Location
    Front Royal, Va
    Posts
    64

    Default

    Do not cut the tank with a torch or plasma cutter without purging with inert gas or filling with water. The heat will vaporize remaining liquid and create an explosive atmosphere inside the tank. Only use a sawzall if you can have someone keep soapy water on the blade the whole time you are cutting and a slower speed with good blades. This way no heat to vaporize the fuel. Oh a co2 extinguisher can be used as a purge gas if one is laying around plus nitrogen or argon will work also. Good luck..................
    HH 210MVP
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  2. #12
    Join Date
    Dec 2012
    Location
    Simcoe Ontario
    Posts
    89

    Default cutting heating oil tank

    It was a 500 gal oil tank. It had been sitting for a couple years and in case you didn't know oil burns not explodes. Ya the oil burned inside it but no explosions.

  3. #13
    Join Date
    Dec 2012
    Location
    Simcoe Ontario
    Posts
    89

    Default cutting heating oil tank

    It's an oil tank. Oil burns not explodes.

  4. #14

    Default

    Dump a pound or two of dry ice in or dump a c02 extinguisher in before you do either....
    Quote Originally Posted by Helios View Post
    Why? To ensure you allowed enough air into the tank to get that perfect oxy-to-fuel explosive ratio?

  5. #15
    Join Date
    Aug 2012
    Location
    Hermiston Oregon
    Posts
    204

    Default

    Why? To ensure you allowed enough air into the tank to get that perfect oxy-to-fuel explosive ratio? [/QUOTE] thats funny
    .
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  6. #16
    Join Date
    Apr 2013
    Posts
    11

    Default cutting heating oil tank

    Sawzaa is ok. Anything flame related is NO GO.

  7. #17
    Join Date
    Dec 2012
    Location
    Front Royal, Va
    Posts
    64

    Default

    Do as Jersey welder says. Anything you use that causes sparks is taking a chance unless you do the correct things first. Fuel oil may only be a combustible with a flash point above 100deg F. but if a blade gets hot enough to burn your finger how hot is that. Certainly it's well above the 100 deg F.. If the blade gets hot enough to vaporize residual fuel then there is a great chance of an ignition and explosion. I would also be spraying my blade with soapy water while i was cutting just for added safety. Just saying............
    HH 210MVP
    Spoolrunner 100
    Powercraft AC buzz box
    Lotas LTP5000D plasma
    Victor Oxy/Acet
    30 ton press
    A few brand name tools
    Lots of no name tools
    A wife to worry me
    and 4 dogs to supervise me

  8. #18
    Join Date
    Dec 2012
    Location
    Front Royal, Va
    Posts
    64

    Default

    Do as Jersey Welder says........
    HH 210MVP
    Spoolrunner 100
    Powercraft AC buzz box
    Lotas LTP5000D plasma
    Victor Oxy/Acet
    30 ton press
    A few brand name tools
    Lots of no name tools
    A wife to worry me
    and 4 dogs to supervise me

  9. #19
    Join Date
    Jul 2008
    Location
    Flin Flon & Creighton area
    Posts
    232

    Default depends on which way you want to cut it

    I have had good luck filling stuff with water till it overflows, then if you have to drain some out to below your cut line. you must be sure that the tank has been completely drained of any liquid fuel before hand and then cleaned out good. pressure washer with detergent works nice. The water totally displaces any of the residual vapours. I even held a bbq lighter over the filler opening and the flame never even flickered. ( and for those guys that think i did this with the empty tank and it was Full right up to the filler spout. No flames, no explosion. Of course you have to ensure any oils or fuel are disposed of to ensure environmental regulations are met. Have done this to several fuel heating oil tanks and even propane bbq tanks with the valves removed. Hit it with the plasma cutter and no issues. Im sure the old oxy-acetylene would work equally well.
    I have a welding addiction

    ...the only stupid question is the one you didn't ask

  10. #20
    Join Date
    Oct 2009
    Posts
    305

    Default

    I'll just throw my 2 cents in if the original poster is still alive. My old boss filled a diesel truck gas tank with water to weld a small repair on it, after a couple seconds of welding the tank suddenly ballooned and push him back. The residual diesel on the inside of the tank turned to vapor with the welding heat then ignited despite being filled with water. He was lucky and didn't get hurt, but honestly the only way to safely weld/cut a fuel tank is to use a degreasing cleaner first then purge the tank with a non reactive gas. If I can't do that then I don't work on it.
    Miller syncrowave 200 runner with coolmate 4
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