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Old 01-29-2008, 11:08 AM
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HF sandblaster popped under pressure

Just had a real good scare with a new Harbor Freight 40 lb sandblaster. I assembled it this morning and was bringing it up to pressure to check for air leaks. The instructions say the working pressure is 60 -125 pounds. I cracked the valved open slightly to let it fill slow for the first time, no use throwing a ton of pressure right off the bat until everything's checked. As it was filling I ran my ear around to listen for leaks (probably get scorned for that!). About the time it got to 80 pounds and I was hovered over the water trap, the trap blew apart BIG TIME.
If that was pointing any other direction my head was gone! As it was it just took a long fast arc across the shop after bouncing off the floor.
The threaded ring that holds the glass bell to the manifold cracked right through and let everything fly. It didn't get cracked with a tool putting it on either, as I got it plenty tight just by hand, like an oil filter works.
Guess I'll go change my shorts and head to HF.

Gary D
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Old 01-29-2008, 11:18 AM
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Wow, that's a real scare. Thanks for posting, maybe you saved someone from getting injured.
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Old 01-29-2008, 11:42 AM
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YIKES!!! And you SHOULD get scolded for putting your head around it to listen for leaks! Id say youre damn lucky you werent hurt!
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Old 01-29-2008, 11:50 AM
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Quote:
Originally Posted by GaryD
J
Guess I'll go change my shorts and head to HF.

Gary D
And, I don't think I would be getting an exchange one either....Full refund...and maybe then some................
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Old 01-29-2008, 11:58 AM
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I definitely won't be using that cheap *** white metal ring stuff again. Next time I'm running it through the good old DeVilbiss air transformer...
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Old 01-29-2008, 12:07 PM
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Here's a shot of how the ring split. Quality isn't great, I took it with the cell phone. Wife's traveling and has the good camera with her!
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Old 01-29-2008, 01:59 PM
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You are lucky indeed! I used a friends 40lb HF special to do a good portion of my '66 a few years ago and it worked well with up to 125psi - looks like you bought a bad one...
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Old 01-29-2008, 06:44 PM
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Let me guess: Made In China?

Glad to hear you were not injured.

Antny
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Old 01-29-2008, 06:52 PM
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Originally Posted by AntnyL
Let me guess: Made In China?

Antny

Funny, but I thought it was appropriate that it happened right now with the heated discussion going on about the China crap at the same time.

Gary D
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Old 01-29-2008, 09:01 PM
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When ever I get a new unknown pressure tool or vessel, I put it in a sheilded corner of the shop and run it up to full pressure.

Big stuff, I throw a blanket over it, at least that'll slow the pieces down as they fly across the shop..

Similarly, when ever I put a new grinding wheel or disc on anything, chop saw , angle grinder whatever, I hold the tool away from me, preferably under a table or bench and run it up to full speed for at least 1 minute..If you read the paper instructions and cautions that come with the good grinding wheels and chop saw blades, that is part of the written procedure.


Probably won't find anything like that with HF stuff though....

Battle scars from exploding shop equipment is a badge of honour....somewhere.... Not really.
Later, mikey
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Old 01-30-2008, 10:29 AM
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I can't understand why some low end tool makers don't spend just a few more dollars to make their product a lot more dependable thus improving their reputation and future sales. I bought a cabinet blaster at one of those tent sales for like $129. It was a very substantialy built unit EXCEPT for the interior hoses which were vinyl and swole up like a tick on a dog the first time I put pressure on it. Swapped them for Goodyear rubber and the unit has served me well.
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Old 01-30-2008, 10:29 AM
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I'm not sure you want to do this with a pressure blaster but the standard test for pressure vessels is to fill them with water and apply pressure. Since water is incompressible there is only a leak not a boom.

The downside off this is now you have to get water out of something that operates best dry.
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Old 01-30-2008, 10:44 AM
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Quote:
Originally Posted by aminga
I'm not sure you want to do this with a pressure blaster but the standard test for pressure vessels is to fill them with water and apply pressure. Since water is incompressible there is only a leak not a boom.

The downside off this is now you have to get water out of something that operates best dry.

It's not really a downside if you get to keep your head where it should be (on your shoulders). Water should dry out of something like that in a week or so. I know I'd sacrifice a week or more to stave off an incident like this.



In a while, Chet.
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Old 01-30-2008, 12:00 PM
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I agree that'd work great for the vessel, but this was the water trap where the air first enters the system. It heads through the inlet valve and right to the trap. The trap didn't break, the threaded ring holding the trap pot to the manifold did. I would have been surprised AND wet!!! Then I'd be peeved!! LOL

Gary
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Old 01-30-2008, 01:55 PM
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ohhhh I guess I missed that part. Whoops. Note to self. Always read and fully understand the complete posting before inserting foot into mouth....


In a while, Chet.
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