Dome calculation?

Discussion in 'Reverse Flow' started by inkjunkie, Jul 21, 2015.

  1. inkjunkie

    inkjunkie Master of the Pit

    Have an unknown size tank that was given to me. Stored refrigerant of some sorts. Easy enough for me to figure out length and circumference/diameter but how does one calculate the volume of the domes?
     
  2. jcbigler

    jcbigler Smoking Fanatic

    Assuming it is relatively spherical, you can use a half sphere calculation, or a whole sphere if both ends are domes of the same size. If it's irregular, I have no idea. 

    Also, be careful cutting up refrigerant tanks, I think they have to be disposed of by qualified professionals due to the the environmental impact of the coolants used in them. 
     
    Last edited: Jul 21, 2015
  3. inkjunkie

    inkjunkie Master of the Pit

    It is empty.
     
  4. radioguy

    radioguy Smoking Fanatic

    Domes are fairly simple, you just need a few more measurements. If it is near spherical just use the round calculations and subtract one half. If it is really oblong then Google dome volume .....there are many calculators out there.

    RG
     
  5. inkjunkie

    inkjunkie Master of the Pit

    Round calculations? Didn't get past Business Math in school....and pretty much don't remember what I learned yesterday so....
     
  6. crankybuzzard

    crankybuzzard Smoking Guru Staff Member Moderator OTBS Member SMF Premier Member

    inkjunkie, you've got mail, PM actually
     
  7. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    Ink, morning...... just guesstimate at 50% of a cylinder.... close enough......
     
  8. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member


    CB, morning...... PM's actually deprive others from learning.... not trying to be an a$$, this is a learning forum.....
     
  9. crankybuzzard

    crankybuzzard Smoking Guru Staff Member Moderator OTBS Member SMF Premier Member

    Hola Dave,

    Wasn't sure about posting an external link, so I sent the PM.  
     
  10. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    From what I understand, external links that are relevant to a specific problem are allowed.... Without that exception, this forum would be close to useless....
     
  11. There is a simple way of calculating the dome volume. The dome shape is called an oblate spheroid (flattened ball!) and the volume can be calculated using the formula V =0.5×0.75×PI×R×R×H. Using diameter instead of radius and simplifying we get

    V = 0.52 × D × D × H, where D is the tank Diameter and H is the dome height measured from the weld seam.

    If we are not too worried by details and can accept a 4% calculation error we can simply use

    V = D×D×H/2

    Or, for both domes in one

    V = D×D×H

    More info on spheroids can be found at https://en.m.wikipedia.org/wiki/Oblate_spheroid

    Cheers /Wes
     
    Last edited: Jul 26, 2015
  12. rikun

    rikun Fire Starter

  13. inkjunkie

    inkjunkie Master of the Pit


    Thanks
     
  14. What did you find to work the best inkjunky? I just got 2 60g and 1 180gallon i need to do my calculations as well, save me cutting them off and welding in flat ends.
     
  15. imafishingfred

    imafishingfred Smoke Blower


    Easy way is to measure tank from end to end . Then measure from weld seam to weld seam . Subtract weld to weld from overall tank. Divide the difference by 1/2 and add the result back to the weld to weld length. This is the tank length you want to use.

    If you look at the sketch, you want 1 end and the center added together. Use the diameter from the center of the tank.

    I should add that I got my info from Dave on how to figure this for my tank.
     
    Last edited: Aug 4, 2016

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