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Pressure sandblaster from propane tank

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  • H80N
    replied
    Originally posted by BREED
    I have a 500 gallon propane tank that I think Im going to make a blaster out of. I have no other use for it.
    or your life either.....

    so........................

    In your case we will make the standoff distance 1000ft.......

    Darwin in action.......................

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  • H80N
    replied
    Originally posted by H80N View Post
    the safety and/or usability of making and using a sandblaster out of a short wide thinwall tank like a 20lb propane can be argued amongst yourselves.... I personally would not be within 50ft of one.......
    some will be driven to construct one simply because they can.... not because it is a good idea.... and they will.......
    Those pics say enough for anybody with any common sense to avoid such a suicidal project....

    but I would like to change what I said about avoiding such a thing by 50ft..... I was wrong.... Make that 100ft...

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  • tanglediver
    replied
    2 year old thread or not, I whole-heartily agree with Bearston and the others who urge you against building pressure vessel projects.
    http://weldingweb.com/showthread.php?t=69011
    The very real threat is nothing to play with. I'm done now, good day.
    http://weldingweb.com/showthread.php...ht=garage+bomb

    Leave a comment:


  • H80N
    replied
    Silicosis Risk..!!

    the safety and/or usability of making and using a sandblaster out of a short wide thinwall tank like a 20lb propane can be argued amongst yourselves.... I personally would not be within 50ft of one.......
    some will be driven to construct one simply because they can.... not because it is a good idea.... and they will....

    the real reason for this post is to suggest that if you plan on doing any sandblasting outside of a cabinet...
    Wear Protection!!!

    Silicosis is a very real hazard to people who sandblast... so make sure that you have a source of clean air under your hood while sandblasting...
    here is a link..

    http://www.silicosis.com/respirators/index.php

    take some time and do an additional search, read and understand the hazards.. before the next time you sandblast...

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  • Bearston
    replied
    glad that YOU approve

    Leave a comment:


  • H80N
    replied
    Doncha just love it when someone digs up an ancient thread and gets into a debate with it????...........

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  • Bearston
    replied
    Nice Bomb. With the quality of those welds, keep your children away from that unit. This is a PRESSURE VESSEL. Unless you've had training for welding on pressure vessels, I wouldn't dare weld on any pressure tank without training, especially a repurposed propane tank. At least get your bomb hydro tested, I doubt that those questionable welds will hold up and over time expect them to fail. It may work once, twice or even 10 times, but be prepared for that thing to blow up and when it does, the shrapnel flies, remember your dealing with COMPRESSED air If you don't care about yourself, that's ok, just don't subject your kids or friends to it. Do yourself a favour and go get a professionally made unit. The $100 that you're saving could cost you or your loved ones your an eye, an arm, leg or even your life. Don't mess with compressed air, even 10 psi can cause an incredible ammount of damage. And then come the lawsuits....

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  • Tim B
    replied
    Originally posted by Sberry View Post
    How about a 40# bottle, would save the cutting/weld.
    i can't find a steel one

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  • Sberry
    replied
    Originally posted by Tim B View Post
    very cool project! have you ever thought of using 2 20lb bottles and cutting one in 1/2 and cutting the ends off another the take the 2 1/2 pieces and weld them on the section you cut the ends off then you will have more capcity. just a thought
    How about a 40# bottle, would save the cutting/weld.

    Leave a comment:


  • billybee60
    replied
    Sandblaster

    I have a similar kind of rig and found that a tank pressure of 10-20 psi seems to feed a good quanity of sand. However it may be too much. What pressure setting are you using on the tank? Does the sand grit get into the feed valve you have on the tank outlet? I don't have a valve like that. Does it work well to control the amount of sand?

    Leave a comment:


  • PTsideshow
    replied
    All of the import type models use an O-ring around the pipe filler neck for a seal. DRY air is more important for free following media.
    Followed by a clear hood window and a great respirator.
    As silicious effect on your lungs is cumulative, and it doesn't take much to cause you problems. And end up joining the oxy bottle brigade at Wally World.

    And if you are using the deadman type import valves, HF is now selling the complete unit handle part for around $15.00 And if you are having a hard time finding the replacement rubber block with the alloy plate Tractor Supply sells them under their job smart brand.
    Abrasive Blasting Deadman Valve with 4 Ceramic Nozzles HF Item # 92189

    And one final thing, during the high humidity months, Don't fill the tank all the way up. And empty the media tank between uses if you won't be blasting weekly. As it will cake up at the outlet and in the fittings at the outlet/hose area.
    Last edited by PTsideshow; 06-22-2011, 05:31 AM.

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  • Jim-TX
    replied
    Originally posted by cws612 View Post
    you do realize that we are talking about welding on a pressure vessel with incredibly questionable welds shown so far! please procede with utmost caution as you are creating a bomb for the hobbyist.
    My thoughts exactly. It works but it's a bomb.

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  • ~willy
    replied
    I've built a few of these back in the 80's. They are a very useful tool, especially prepping material for welding.

    I extended the arm of the bottom feed valve so that it can be nudged w/ a foot or is easier to adjust while wearing gloves.

    I have built a few of these and never used a rubber gasket. It could be that your pipe fitting warped from welding.

    One needs to take precautions when cutting or welding on a propane tank; not for the amateur. Freon tanks also work and are more portable.

    When using these you need a supply of DRY air. Moisture will cause sand to clog.

    Keep in mind that there are inherent dangers in welding and danger in sandblasting.
    Sandblasting can cause silicosis, and many novice types will not use proper ventilation/respiration precautions.
    By the way, you'd be surprised at the damage you can do to equipment from dust particles floating in the air or how far the sand can travel and still damage automotive glass. If it can damage automotive glass..... it may also pose a rick to your eyes as well. Use proper safety equipment. You wouldn't weld without a welding helmet; RIGHT.... ?
    A word to the wise....

    Willy
    Last edited by ~willy; 06-21-2011, 07:53 AM.

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  • cws612
    replied
    you do realize that we are talking about welding on a pressure vessel with incredibly questionable welds shown so far! please procede with utmost caution as you are creating a bomb for the hobbyist.

    Leave a comment:


  • Tim B
    replied
    very cool project! have you ever thought of using 2 20lb bottles and cutting one in 1/2 and cutting the ends off another the take the 2 1/2 pieces and weld them on the section you cut the ends off then you will have more capcity. just a thought

    Leave a comment:

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