Cleaning a pressure vessel

  1. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    I received as payment a felisatti 913/100 air compressor and I need to clean the tank because it was filled with water and any kind of junk
    What I should use to clean it as I can check if the tank is still usable?
    I removed the water by opening the moisture discharge valve and it was clean but I'm sure that the tank is very dirty inside.
    Another thing is possible that the tank is 4 or 5 millimetres thick?
    I put my finger in a coupling and I felt that the tank seems to be thick (put the metal between my fingers
    The compressor is almost 40 years old
     
  2. 8ob

    8ob Member

    Messages:
    3,682
    Location:
    moscow on thames
    At forty years old and having been used as a water tank I would seriously be thinking of scrapping it.

    Bob
     
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  3. Davidcardiff Member

    Messages:
    95
    Location:
    Kildare . Ireland
    Pressure washer with a drain jetting head in through the end port ?
     
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  4. pedrobedro

    pedrobedro Man at Matalan

    Messages:
    9,514
    Location:
    CX Derbyshire
    Tap it with a hammer and listen to the sound. Is it an old tank with removable glands? If there's no way to clean it out just use a good separator on the line after you have drained it.
     
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  5. 500e

    500e Always buy fire insurance a flood is hard to start

    Messages:
    3,692
    Location:
    Somerset UK
    Must be a small tank with no inspection port would turn it into a Barby
    If it is 100Ltr should it not have the port for internal examination
     
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  6. Lazurus

    Lazurus Member

    Messages:
    394
    Location:
    Norfolk uk
    An internal soak with citric acid?
     
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  7. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    Only moisture formed in the years
     
  8. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    Hammering sounds good no difference between downside and upside
     
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  9. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    That's an idea that I thought too ,but I don't know if this should cause corrosion
    How long I have to wait before to drain and try to use a pressure washer to remove all the rust?
     
  10. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    Yep I was trying to see through the ½" fittings
     
  11. Yamhon New Member

    Messages:
    119
    Location:
    Yorkshire, UK
    You might be able to get a cheap inspection camera off of Ebay, or borrow one to check the quality inside.
     
  12. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    The friend that gave me the compressor ,has given me more information about the compressor life
    It's been bought nearby 1988 and 1992 ,always being purged from the moisture , changed the oil every year
    10 years ago he quit the woodworking shop and stopped it
    3 years ago something being dropped on the pressure regulator
    So I think that the moisture in the tank is recently formed in it so there is a good chance that this thing can be good
    Is rathed for 20 ATM and it works at 10 ATM
     
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  13. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    I will ask to someone after cleaning using citric acid
     
  14. Lazurus

    Lazurus Member

    Messages:
    394
    Location:
    Norfolk uk
    Not sure 48 hours and then a wash out, its got to help?
     
  15. gaz1

    gaz1 Member

    Messages:
    7,611
    Location:
    westyorkshire
    mines a 170 litre tank with a pump on it and no inspection port on it

    https://www.mig-welding.co.uk/forum...needs-some-attention-to-it.65839/#post-857111

    im just about to scrap the above compressor tank havent used it in 2 years dont have the motor anymore but do have another pump that runs at 240v

    the pump on that one works as it does presurise against a hand against the pump tank feed unknown if any back pressure on it

    as goes for water in a tank get rid its dangerous if water has been sat in it over a long time , copper degrades over tank with copper tanks thats why the bust open after years of use and expansion due to heating them up
     
  16. knighty Member

    Messages:
    1,604
    Location:
    Sunderland
    how full of water was it?

    I'd just use it as is...cleaning will probably cause more problems than it fixes
     
  17. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    Half tank
    And the rust isn't all rust there is also a good amount of burned sawdust
    I found it also into the pump head
     
  18. Memmeddu

    Memmeddu Member

    Messages:
    652
    Location:
    Italia Sardegna
    Sorry but I can't understand
    Can you tell me this using simpler terms
    I opened the pump and I found a good amount of sawdust in the head ,valves are stuck and on the compression side the sawdust caught on fire in some moment of the life of the compressor
    I think that isn't worth anymore trying to repair it ,but I can increase my experience trying the impossible to repair it
     
  19. Brad93

    Brad93 M J B Engineering

    Messages:
    5,393
    Location:
    Essex
    The only way to be certain this tank is safe is to have a thickness test carried out with UT and then a hydro test.
     
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  20. melle Member

    Messages:
    283
    Location:
    Bath UK/ Dublin IRL
    This topic may be of interest.
     
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