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  1. #41
    Join Date
    Nov 2003
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    3,212

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    It is just a bad idea!!!... over time the sand will erode the inside of the tank and fittings..(rather quickly)..... they will get thinner over time... at some point it might look perfect on the outside... while the inside is paper thin.... and will rupture at some point.... why endanger yourself or anybody else in the vicinity???.....

    it is a pressure vessel that self degrades with use...

    looks like darwin award material to me.... just do not take anyone with you....

    how many times must this be pointed out???
    Last edited by H80N; 02-24-2012 at 02:08 PM.
    .

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  2. #42
    Join Date
    Aug 2008
    Location
    Riverside, NJ
    Posts
    7

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    Quote Originally Posted by H80N View Post
    It is just a bad idea!!!... over time the sand will erode the inside of the tank and fittings..(rather quickly)..... they will get thinner over time... at some point it might look perfect on the outside... while the inside is paper thin.... and will rupture at some point.... why endanger yourself or anybody else in the vicinity???.....

    it is a pressure vessel that self degrades with use...

    looks like darwin award material to me.... just do not take anyone with you....

    how many times must this be pointed out???
    I do use black beauty abrasive and I don't use that much or I would buy something big but even the ones we buy would erode after heavy use. For safety every year we should test again the tank with the pressure washer, doesn't take that much time.

  3. #43
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,913

    Cool

    I weld pressure tanks almost everyday at work then they get hydroed or tested with air. I treat each one with respect that i test with air. Anything could happen and each one is looked at before i add the air. No hurrys. The next 4 tanks i am building are 26 feet long and 20" in dia. I only test them to 30 psi and then a dish soap water test on the fittings but thats a lotta air. We pressure tested gasoline barges on the Ohio River with 2# of air and it takes a while to fill them up to find leaks. A guy showed me how a 1/2# that was left in the barge and if you pounded the hatch open with a hammer it had so much force it would break your leg if it hit you, 1/2#. It opened my eyes to really pay attention...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
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  4. #44
    Join Date
    Sep 2005
    Location
    16919 Pole Rd. Brethren, MI 49619
    Posts
    4,395

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    You probably wont like mine then.
    Attached Images Attached Images

  5. #45
    Join Date
    Jan 2008
    Location
    Newfoundland, Canada
    Posts
    66

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    Wow. It's been a loooong time since I've been here. Anyway. That blaster of mine has been used now for ten years or more. The only thing I've ever replace on it was the main hose. It's longevity has to speak for itself but its been flawless so just because I built it out of a propane tank do not mean its going to fail or be dangerous to operate. I have many safety features built into it such as a safety pressure relief valve and a dump valve.
    This unit has hundreds of hours on it and its as good as the day it was built. Everything in my collection and including my commercial work has been done with this unit. You got to be kidding when you say this unit is dangerous. The unit only handles 100psi of air. If the side came out of it the only thing would happen is it would put sand into the air.
    When it comes to my workmanship and my blaster design You sir don't know what your talking about. Simple as that!



    http://www.flickr.com/photos/1560239...7608396649530/














    Quote Originally Posted by H80N View Post
    Wildfire
    just because you got it into print does NOT make it a good idea!!!

    modifying a pressure vessel without the proper engineering or hydrostatic test is not a good practice... it is downright dangerous and ill advised.....
    Sandblasters are particularly dangerous because the sand/abrasive will erode the inside surfaces as it is being used leaving the outside visually fine...

    The outside may look perfect but the inside may get worn paper thin over time... leaving it primed for a catastrophic and deadly rupture at any time....

    This is especially dangerous for beginners who;s skills are lacking and who look to more experienced members for sound advice...

    This is a Very DANGEROUS practice... use some common sense and do NOT do it...!!
    Last edited by wildfire; 02-09-2013 at 02:44 PM.
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  6. #46
    Join Date
    Feb 2012
    Location
    Wa
    Posts
    578

    Default

    Wow. Such ignorance, only 100psi, haha. People have no idea how quickly things can go from fine to terrible.

  7. #47
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,913

    Cool

    Quote Originally Posted by wildfire View Post
    [COLOR="#0000CD"] When it comes to my workmanship and my blaster design You sir don't know what your talking about. Simple as that!


    Wildfire.
    Its not that simple. You have great pics and do wonderfull work for sure but please remember this is a public forum and some people aren't as gifted in the real welding world and think just because they have seen it here that they can do it. Maybe they can and maybe they shouldn't but its the internet and it has to be true, in some peoples eyes. I have seen air tanks come apart with just 100 lbs of air as it was my fathers just as he was done filling it with only 100 lbs, set it down and picked it back up and it blew. 6 weeks in the hospital and i will never forget that. Just my thoughts...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  8. #48
    Join Date
    Nov 2011
    Location
    Toronto
    Posts
    4

    Default

    Bump
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  9. #49
    Join Date
    Nov 2012
    Posts
    11

    Default

    Hi, if anyone is so stupid as to see the posts and think "Hey I can do that too" who's gonna hold his/her hand the next time they cross the road. The whole point of posting your projects is to show the World what YOU have done, not suggest that that is the way to go about it. The point also is if you hydraulic test to 1-1/2 times the working pressure you are sure the job is sound. The point someone made about the container wearing away inside due to sand abrasion is probably not valid as the sand or abrasive material is just sitting there and not actively blasting the interior like the nozzle would get, and that applies to commercial tanks too that are made from the same thin metal as a propane tank, only they have a name attached to say it was made by whoever and tested hydraulically on such and such a date. If the hydro test fails due to poor welds, the water will only spurt out briefly. Ian.

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