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Anyone Ever Built an Air Tank?

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  • #31
    I've found a 80 gallon tank locally. All I have to do now is fab up the mount for the compressor and motor and plumb it all up. The new motor should be here Monday, so hopefully I'll have it running next week. I know full well the dangers of air tanks, a neighbor of mine lost one of his legs from the knee down from a failure. Unfortunately he just happend to be walking by when it failed, yes it was a factory made tank. I'd never seen anyone build their own tank, that's why I asked here. The ends were something I was not sure of, hence the original post. There are people on here with far more experience than I have, or will ever have. There was no intention on my part to cobble something out of scrap. I am very capable of building it and doing a good job at it. I have a street/strip 69 Dart that runs low 7.20s at 95 mph in the 1/8 mile that I did all of the fab work on, so I trust my work. If I was not confident in my skills i would never even consider tackling such a job. Thanks to all of you that offered useful information .
    Last edited by justinp61; 05-13-2008, 05:24 PM.

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    • #32
      Justin
      Well said. And I'm not here to tell anyone what they should do either. Just pass along my experience and hope I help someone out.
      If I had a nickel for every time someone told me I can't do something or I should leave it to a "professional" I'd have enough money to pay someone else to do it.
      Things that I've done that most would not attempt or should not attempt.
      (Keep in mind I'm talking about the general public, not people that post here)
      rebuilt my first truck engine at 18 rebuilt my motorcycle engine at 20, i was already reloading ammo for a few guns at the time too. Rebuilt the diff in my jeep at 25, Learned how and did anodizing in my garage for four years for real paying customers, Rebuilt a few rifles i.e. stocks and barrels including setting the head space. And just in general fixed what was broke improved what needed improving Fabed, welded, and machined anything i needed all with little help from anyone.
      I'm not boasting what I'm saying is if you are skilled and fully understand all the intricacies involved with a project then by all means have at it.
      But do the research first and find out if there is something you're missing.
      you'll be a better person for it and keep all your fingers too.
      Kerry
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      • #33
        Tanks alot!

        Listen, I've made my own 30 gal. tanks out of 3 11 gal. tanks. I agree that the chinese products are inferrior. To buy a tank though, is almost unaffordable. I was quoted $1500.00 per tank for what I made for about $300.
        Thanks,
        Lance
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        • #34
          As far as I'm concerned the ASME cert. tags on most compreors are for liability purposes. I'd trust some of the farmer welds my dad makes before some of those chinese tanks. At work some pressure vesseles don't even require ultra sound or X-ray testing and they hold as much as 2,500psi. However, They are engineared with about as much overkill as a WW2 Tiger tank. I think the highest any of ou'r vessels get to is usualy around 4,500psi.


          Here's a small one:


          http://i162.photobucket.com/albums/t...Picture063.jpg

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          • #35
            anti-GMAW, I think the tank in you're photo would hold enough air for me. It would wear my compressor out filling it though.

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            • #36
              Originally posted by KEENAVV View Post
              Buy a tank. You'll live longer!
              I certainly agree. Furthermore, when you do buy your tank, make sure that it is marked with an "ASME" tag. I have an 80 gallon vertical air compressor with an ASME tank and I wouldn't want to be anywhere near it if it ever blows. An ASME certification is worth more than mere talk. It signifies that the tank was built and tested to a known specificaton and that it is safe for the use intended.

              My tank is abut 15 years old and it was made in USA.

              Assuming an operating pressure of 150 psi, that's going to amount to a lot of pressure on each square foot.

              It's more than merely being able to fabricate and weld the tank. It's the material you would use and the necessary hydrostatic testing after it's "done".

              Uh-uh. That's not a job I'd tackle. There are certified tanks available from places like MCS and Grainger. That would be my course of action.

              Gutless in Sacramento.
              Last edited by Synchroman; 05-14-2008, 04:22 PM.
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              • #37
                big used replacement tank on ebay

                check out ebay item number 130220533358

                now that's an air tank
                1 BEST 6 Y/O HELPER IN THE WORLD
                2 VICTOR O/A TORCHES
                LINCOLN SP 175 PLUS
                4 EACH 20 TON JACKS
                SEVERAL LESSER TON JACKS
                SEVERAL GRINDERS
                LOTS OF HAMMERS MISC SIZES
                BIG PILE OF MISC TOOLS
                CLASS A CDL'S
                C7500 FLAT BED
                4 TRAILERS
                HOME MADE GANTRY CRANE
                SOME GOOD COMMON SENSE (I THINK)
                TRACTOR WITH NEW HEAVY DUTY LIFT POLE -- FIND MY THREAD
                6 GOATS, 1 DOG, 1 DONKEY...
                ON AND ON AND ON...

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                • #38
                  Originally posted by grnxrymnky View Post
                  check out ebay item number 130220533358

                  now that's an air tank
                  I installed a tank like that at my old day job. But the guy selling is a wee bit off on his math. It's about 500 gallons not 900.
                  Miller Syncrowave 200 W/Radiator 1A & water cooled torch
                  Millermatic 252 on the wish list
                  Bridgeport Mill W/ 2 axis CNC control
                  South bend lathe 10LX40
                  K.O. Lee surface grinder 6X18
                  Over 20 years as a Machinist Toolmaker
                  A TWO CAR garage full of tools and a fridge full of beer
                  Auto shades are for rookies
                  www.KLStottlemyer.com

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                  • #39
                    Has anyone used propane cylinders as a cheap alternative to buying airtanks? for example you could get a 100lb propane cylinder and rig it for an extra air resevoir on your trailer or in your shop or something?? i've always thought of this and was told there was a safety factor of 3 or something built into the tanks.. not quite sure but a full cylinder yeilds 100 psi abouts last time i checked. What do you guys think?
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                    • #40
                      An 80 gallon air tank holds 80 gallon at zero psig , at 150 psi that 80 gallon tank in really holding the equivent of 896 gallons of air at atomospheric pressure, because of the density of the compressed air. If you use the formula to figure density, this explains why a 220 cuft gas cylinder, is small enough to carry, as a cubic foot of air is the air volume in 3' x 3' x 3' box at atomospheric pressure. As the pressure goes up the stored air is actually engergy, trying to uncompress itself.

                      cylinder or tank pressure + 14.7 / 14.7 = density factor

                      using the 80 gal tank at 150psi

                      150psi +14.7 = 164.7 / 14.7 = 11.2 density factor
                      80 gal x 11.2 = 896 gallons




                      example a 220 cuft oxygen cylinder at 2200 psi

                      2200 + 14.7 = 2214.7 / 14.7 = 150.6 density factor

                      220 cuft / 150.6 = 1.4 cuft the actual capacity of the cylinder at atomospheric pressure.

                      Jack

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                      • #41
                        Propane Tanks

                        I wouldn't do it! Propane tanks are made of about 16 gauge steel and never see moisture.
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                        • #42
                          Originally posted by platypus20 View Post
                          as a cubic foot of air is the air volume in 3' x 3' x 3' box at atomospheric pressure.
                          How is a cubic foot = to 3 feet X 3 feet X 3 feet? My math works to a cubic Yard or 27 CF. Your other calcs make sense to me, sort of. I know 14.7 psi is equal to air at sea level and you need to add that to anything if you are calulating absolute presures.

                          I usually work from a known volume say 104 cf @ 2640 psi and then calculate CF basied on presure so at 1320psi you have 52 cf. The math gives you 1 cf @ 25.38 psi. That same tank would hold a bit over 165 cf if you could push the psi to say 4200psi.


                          Originally posted by Iron Head
                          Wonder if portable, (diesel driven) compressors fall under this same inspection?
                          I'm trying to remebmber most of the portable diesel comps I worked with when I worked at the comp shop. I know they are mostly rotery screw machines and I doubt that they have a "tank" if so its a small one. I would guess that they run air straight from the compressor as those screw machines generate very large volumes of gas so storage would not be required.

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                          • #43
                            Originally posted by DSW View Post
                            How is a cubic foot = to 3 feet X 3 feet X 3 feet? My math works to a cubic Yard or 27 CF. Your other calcs make sense to me, sort of. I know 14.7 psi is equal to air at sea level and you need to add that to anything if you are calulating absolute presures.
                            Yes you are right, my mistake that a cubic yark, not a cubic foot, which is 1' x 1' x 1'. sorry

                            Jack

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                            • #44
                              Propane Tank

                              Look into a large horizontal propane tank. The two most popular sizes are 500 and 1000 gal. They are built to an ASME standard. They have a ASME tag. IS there a difference between the standards of an air tank compared to a propane tank?? I had a 1000 gal size i bought from a propane supplier, the ASME tag had been knoked off of the tank and they were no longer allowed to use it. After i bought it i filled it with water and then did a hydro test to 300 psi, double the 150 psi that a portable screw compressor made. I used it as a resivor to blow steam whistles.

                              Weekend Welder

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                              • #45
                                PSI is PSI

                                So, you fill a air tank with 15 psi. Then you fill another tank with thicker walls, it's still the same. I've worked with hydraulics for a long time. 150 PSI is nothing. If that tank explodes, it'll just crack a seem and leek out. There will be no explosions at all. Look at gas cylinders, 2500 PSI, stored on service trucks. There is no problems with that. Still, no propane tanks in my opinion, should be used for compressed air. They are too fat in diameter. I'm not an engineer, but happy with my homemade setup.

                                Thanks,
                                Lance
                                Millermatic 210
                                Syncrowave 200
                                Spectrum 625 X-treme
                                Hobart Champion 16 W/
                                Miller 8VS Suitcase
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                                Tons of Tools
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