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Thread: How Convert volume to air gallons

  1. #1
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    How Convert volume to air gallons

    Could use a little help/confirmation. My deceased father left many garage items and one is an upright (on wheels) air cylinder. Pics tomorrow to follow. It measures approx 20 inches in diameter and 40 inches high. If my rough math is near correct that equates to about 12,500 cubic inches volume.

    What I am trying to do is estimate the air capacity in gallons. Just looking at my sears 25 gallon compressor, I am leaning towards 55 gallons or so of air capacity. Does that sound reasonable?

    Then, I wonder what air pressure to be safe. It seems similar to an old propane tank but somewhat stouter. I expect it should be pressure tested. However, it seems far better than my sears 25 gallon. I am currently filling it to approx 75 psi, and the volume helps.

    The tank comes in handy, it has a handle welded to it and attached to the handle is a cup (piece of pipe) that fits nicely over a 2 inch ball when tilted forward and attached to lawn tractor or whatever. Makes for a handy portable air tank.

    So, am I close at 50 to 55 gallons? I can sense the responses bout tank rupture, so we are prepared. Thanks folks..
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    Re: How Convert volume to air gallons

    Quote Originally Posted by geezer View Post
    Could use a little help/confirmation. My deceased father left many garage items and one is an upright (on wheels) air cylinder. Pics tomorrow to follow. It measures approx 20 inches in diameter and 40 inches high. If my rough math is near correct that equates to about 12,500 cubic inches volume.

    What I am trying to do is estimate the air capacity in gallons. Just looking at my sears 25 gallon compressor, I am leaning towards 55 gallons or so of air capacity. Does that sound reasonable?

    Then, I wonder what air pressure to be safe. It seems similar to an old propane tank but somewhat stouter. I expect it should be pressure tested. However, it seems far better than my sears 25 gallon. I am currently filling it to approx 75 psi, and the volume helps.

    The tank comes in handy, it has a handle welded to it and attached to the handle is a cup (piece of pipe) that fits nicely over a 2 inch ball when tilted forward and attached to lawn tractor or whatever. Makes for a handy portable air tank.

    So, am I close at 50 to 55 gallons? I can sense the responses bout tank rupture, so we are prepared. Thanks folks..
    Well... since there are aprx. 7.48 gallons in a cubic foot..... and you have a cylinder with 12,566+ cubic inches in it... seems easy enough

    12,566 / 1728 = 7.2719 (FT3)

    7.2719 X 7.48 = 54.39 (GAL)

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  4. #3
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    Re: How Convert volume to air gallons

    I believe tackit... or maybe it was someone else??? had a thread on hydrotesting your own tanks here somewhere that way you could at least 'proof' test your tank and make sure it has a relief valve on it for somewhere below where you test to

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    Re: How Convert volume to air gallons

    [QUOTE=ronsii;8781571]Well... since there are aprx. 7.48 gallons in a cubic foot..... and you have a cylinder with 12,566+ cubic inches in it... seems easy enough

    12,566 / 1728 = 7.2719 (FT3)

    7.2719 X 7.48 = 54.39 (GAL)[/QUOT

    7.48 for dry calculations. You are correct sir, should have figured that myself. Anyhow, my Kentucky windage was on target.
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    Re: How Convert volume to air gallons

    Oh, here's tackit's thread on the DIY hydrotest... https://weldingweb.com/vbb/showthrea...te-of-at-tank/

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    Re: How Convert volume to air gallons

    Much obliged sir
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    Re: How Convert volume to air gallons

    Quote Originally Posted by geezer View Post
    Much obliged sir
    Yer welcome

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    Re: How Convert volume to air gallons


    geezer


    Quote Originally Posted by geezer View Post
    . . . I can sense the responses bout tank rupture, so we are prepared . . .
    Your post - sound like you are trying to kill the entire neighborhood - what,
    is the end use, of your Manhattan Project - reverse engineering . . .

    hth


    Opus



    .

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    Re: How Convert volume to air gallons

    It is 231 cubic inches to 1 gallon
    It is what for a long time and hand calculator

    But today I use a app
    Faster too and most convention
    See at
    https://play.google.com/store/apps/details?id=kr.sira.unit

    Dave

    Quote Originally Posted by geezer View Post
    Could use a little help/confirmation. My deceased father left many garage items and one is an upright (on wheels) air cylinder. Pics tomorrow to follow. It measures approx 20 inches in diameter and 40 inches high. If my rough math is near correct that equates to about 12,500 cubic inches volume.

    What I am trying to do is estimate the air capacity in gallons. Just looking at my sears 25 gallon compressor, I am leaning towards 55 gallons or so of air capacity. Does that sound reasonable?

    Then, I wonder what air pressure to be safe. It seems similar to an old propane tank but somewhat stouter. I expect it should be pressure tested. However, it seems far better than my sears 25 gallon. I am currently filling it to approx 75 psi, and the volume helps.

    The tank comes in handy, it has a handle welded to it and attached to the handle is a cup (piece of pipe) that fits nicely over a 2 inch ball when tilted forward and attached to lawn tractor or whatever. Makes for a handy portable air tank.

    So, am I close at 50 to 55 gallons? I can sense the responses bout tank rupture, so we are prepared. Thanks folks..

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    Re: How Convert volume to air gallons

    Quote Originally Posted by OPUS FERRO View Post

    geezer




    Your post - sound like you are trying to kill the entire neighborhood - what,
    is the end use, of your Manhattan Project - reverse engineering . . .

    hth


    Opus



    .


    Well I sincerely hope not, my closest neighbor is 1/4 mile away. Happy Thanksgiving
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    Re: How Convert volume to air gallons

    For high-pressure cylinders, they put the tank into another tank filled with water, and then even if it blows, it blows up vertically and not horizontally.

    The reason there is real concern about quickly filing a tank is that heat is generated when you condense any gas. The heat from condensation can cause, metal to glow red almost instantly. Over the years when starting up large rack systems with large compressors, I have seen a large metal vessel the condenser that was supposed to be water-cooled but was not getting water, heat to emit radiant heat in three seconds. The tank weighs several hundred pounds and it just starting radiating heat in a couple of seconds. If you have ever seen melted reeds in a compressor head you know the power of condensation.

    That is the danger of draining propane tanks too quickly. You can have nearly zero pressure over the liquid propane. I have heard where an icy tank was dropped or warmed and it detonated. Never did much testing but the information seemed sound and came from some pretty rugged boys.

    Sincerely,

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    If I wasn't so.....crazy, I wouldn't try to act normal, and you would be afraid.

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    Re: How Convert volume to air gallons

    Quote Originally Posted by William McCormick View Post
    For high-pressure cylinders, they put the tank into another tank filled with water, and then even if it blows, it blows up vertically and not horizontally.

    The reason there is real concern about quickly filing a tank is that heat is generated when you condense any gas. The heat from condensation can cause, metal to glow red almost instantly. Over the years when starting up large rack systems with large compressors, I have seen a large metal vessel the condenser that was supposed to be water-cooled but was not getting water, heat to emit radiant heat in three seconds. The tank weighs several hundred pounds and it just starting radiating heat in a couple of seconds. If you have ever seen melted reeds in a compressor head you know the power of condensation.

    That is the danger of draining propane tanks too quickly. You can have nearly zero pressure over the liquid propane. I have heard where an icy tank was dropped or warmed and it detonated. Never did much testing but the information seemed sound and came from some pretty rugged boys.

    Sincerely,

    William McCormick


    Well I am certainly better informed. Appreciate and experienced heat generated from compressed gases, but penny really dropped with propane example. I dunno if the cylinder is an old propane bottle or not, it seems stouter and the gentleman who actually thought this up was a retired pipeline welder from years past. I have used it twice and try to keep pressure to max 75 or 85 psi. That helps to inflate tires around the place, like an old farmall H that was setting in the garage for approx 5 years and had a low tire.....got'er running to. Thanks again for posting.
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    Re: How Convert volume to air gallons

    I think William needs to brush up on the definitions of "condense" and "compress".
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    Re: How Convert volume to air gallons

    Here is a couple shots of the beast, crude but works. Name:  20201128_145856.jpg
Views: 445
Size:  133.8 KBName:  20201128_145741.jpg
Views: 444
Size:  123.9 KB
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    Re: How Convert volume to air gallons

    I blew it, did not turn my phone sideways.
    Last edited by geezer; 11-28-2020 at 06:08 PM.
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  26. #16
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    Re: How Convert volume to air gallons

    By the looks of the welds on that I'd haul it to the scrap yard. That weld along the side scares me to look at it.
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  27. #17
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    Re: How Convert volume to air gallons

    I'm going with nope.

    That one needs to be retired and made into a cooker of some sort
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    Re: How Convert volume to air gallons

    Quote Originally Posted by mla2ofus View Post
    By the looks of the welds on that I'd haul it to the scrap yard. That weld along the side scares me to look at it.
    yup, no eye appeal at all. Like I say retired pipeline gent from years past with AC only machine and lots of candles on the cake. Maybe I should have waited for a rainy day with lots of haze prior to taking a pic, however, your comment valid.
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    Re: How Convert volume to air gallons

    Quote Originally Posted by MinnesotaDave View Post
    I'm going with nope.

    That one needs to be retired and made into a cooker of some sort
    Noted: And good recommendation
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    Re: How Convert volume to air gallons

    Quote Originally Posted by mla2ofus View Post
    I think William needs to brush up on the definitions of "condense" and "compress".
    They are pretty much the same, the reason we call a condenser a condenser is that in refrigeration, that is where the hot gas is condensed and turned into a liquid. You can say it is compressed into a liquid and that would also be a true statement. The condenser is where the hot gas compressed by the compressor loses its heat and so the action of condensation can occur. However, before you reach a temperature and pressure that will liquefy the gas it is being condensed and that causes heat.

    With very cold liquid propane, believe it or not, it cannot absorb sudden heat, you would think it would be hungry for heat and it is, but just not sudden heat. So the surface of the liquid superheats much like the surface of a cathode in a cathode ray tube and boils off a layer of liquid propane in an instant, which increases pressure and causes more heat and more pressure.


    Sincerely,

    William McCormick
    If I wasn't so.....crazy, I wouldn't try to act normal, and you would be afraid.

  31. #21
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    Re: How Convert volume to air gallons

    Hey, try this formula to calculate air galloons that you need:

    • L x W x D. = Cubic Feet.
    • Cubic ft x 7.47 = Gallons.

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    Re: How Convert volume to air gallons

    When filling high pressure cylinders taking temperature's is part of the process. They can get quite hot and you have to compensate for it. Acetylene cylinders are cooled with water when filling and take several hours to fill. I wouldn't trust the tank in question.

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    Re: How Convert volume to air gallons

    Quote Originally Posted by ronsii View Post
    Well... since there are aprx. 7.48 gallons in a cubic foot..... and you have a cylinder with 12,566+ cubic inches in it... seems easy enough

    12,566 / 1728 = 7.2719 (FT3)

    7.2719 X 7.48 = 54.39 (GAL)

    Oh yeah sure, for US gallons, and post 1959 feet, but how about imperial gallons, and that tank could predate 1959, so non standard inch measurements...
    Last edited by walker; 02-02-2021 at 08:39 PM.

  34. #24
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    Re: How Convert volume to air gallons

    Quote Originally Posted by Barclay View Post
    Hey, try this formula to calculate air galloons that you need:

    • L x W x D. = Cubic Feet.
    • Cubic ft x 7.47 = Gallons.
    Never seen a pressure vessel measured in length x width x depth. Maybe area of dia. x length + volume of sphere ( 2 ends combined).
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  36. #25
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    Re: How Convert volume to air gallons

    Quote Originally Posted by mla2ofus View Post
    Never seen a pressure vessel measured in length x width x depth. Maybe area of dia. x length + volume of sphere ( 2 ends combined).
    I've seen small cylinder air pressure tanks with flat ends.... just for blowing dirt... sawdust off with

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