Hi David
thanks for checking over my work...was too late in the day! I divided
instead of multiplied in converting cu ft to gals...
I took the lazy way and looked up 7.48 gals/ cu ft, or 0.13 cu ft/
gal..then plugged it in "upside down"...causing an error of 7.48^2....glad
you had a gallon can and the time to go measure it!
anyway, the new table looks a little better:
Pipe ID Vol / 100 ft ft / gal
[inch] [cu ft] [gals]
0.50 0.14 1.02 98
0.75 0.31 2.29 44
1.00 0.55 4.08 25
1.25 0.85 6.37 16
1.50 1.23 9.18 11
so, for the common 3/4 in pipe, 44 ft gives a gallon of extra air storage...
thanks
paul
>
> On 1/2/07, John T. Blair <jblair1948@cox.net> wrote:
>>
>> At 11:54 AM 1/2/2007 -0700, Paul wrote:
>> >
>> >on a related note, I recall a mention in the prior thread re: piping
>> >adding to volume of stored air in tank...
>> >
>> >I did a diddy with EXCELL...think i got it right..came up with
>> >
>> >
>> >Pipe ID Vol / 100 ft ft / gal
>> >[inch] [cu ft] [gals]
>> >
>> >0.50 0.14 0.02 5486
>> >0.75 0.31 0.04 2438
>> >1.00 0.55 0.07 1372
>> >1.25 0.85 0.11 878
>> >1.50 1.23 0.16 610
>> >
>> >
>> >If i did this correctly (somebody please verify for us), then 200 ft of
>> >3/4 in pipe adds 0.08 gallons of air storage;
>> >
>> >or, you'd need over 5000 ft of pipe to add one gal of air storage. at
>> $2/
>> >ft, roughly, that's $10,000 of pipe for a gallon of air....
>>
>>
>> Not too sure how you set got your figures, but I think they are a little
>> off.
>> I just went out and measured a Gal. can of lacquer thinner. The can
>> measures:
>>
>>
>> Inches Ft
>> Hight - 9.5 .79666
>> Width - 7 .58333
>> Depth - 4 .33333
>>
>> Volume of a rectangle
>>
>> V = L * W * D
>>
>> V = .7966 * .5833 * .333 = .158 Cu Ft.
>>
>> ----
>>
>> Given a Pipe of 1" Dia. or .0833 Ft.
>>
>> Area = Pi * R^2
>>
>> A = 3.14 * (.0833/2)^2
>> A = 3.14 * .04165^2
>> A = 3.14 * .0017347
>> A = .005447 Sq Ft
>>
>> The cross sectional area of a 1" pipe is about .005447 Sq ft.
>>
>>
>> So if a gal is .158 Cu Ft
>>
>>
>> -----
>>
>> Now setting up a ratio
>>
>> .158 Cu ft 1 Gal
>> ----------- = ---------
>> .005447 Sq Ft x
>>
>>
>>
>> we get x = .005447 Sq ft * 1 Gal
>> ------------
>> .158 Cu Ft
>>
>> x = .0344 Gal
>> --------
>> ft
>>
>> Or about 29 Ft/ gal
>
> A gallon is 0.134 cubic feet. Assuming the rest of the math is right,
> that's 0.0406 gal/ft, or 24.6/ gallon. If you go to 2" pipe, you get
> a gallon every 6 feet. A shop I used to work in had a loop around
> outside, of 2 or 2 1/2 pipe, about 180 feet or so. That's 30 gallons,
> 1/4 the capacity of the two 60 gallon tanks attached to the
> compressor, so a 20% increase in capacity. That's somewhat more pipe
> than you're going to have in your garage at home, of course.
>
> Industrial compressed air systems often have enlarged supply lines
> near intermittent high-draw loads. Easier to find space for the pipe
> than a surge tank.
>
> --
> David Scheidt
> dmscheidt@gmail.com
>
> Your messages not reaching the list?
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