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Tool Talk Discussion Forum

Sandblast pressure pot problems...

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Jay87T

06-22-2005 17:08:05




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Hey guys I have a 40lb pressure pot I bought off ebay awhile ago, I finaly got a chance to try it for the first time today. I filled it up about 1/2 way with sime silica sand I bought from NAPA, hooked up my hose, set my pressure to about 80psi turned on all the ball valves on the pot and began to blast, starts out great, then it seems like the sand stops flowing unless I move the pot around then starts flowing again, anyone have a idea what the problem can be?

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carol Martin

06-23-2005 11:08:12




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 Re: Sandblast pressure pot problems... in reply to Jay87T, 06-22-2005 17:08:05  
I have one that I got from HFT. It took me a while to get all the adjustmens down but then it works great. I use just plain Mortar Sand that is WELL dried and sifted. start with the main input valve and the bypass valve on the top open when the pressusre is built up. fully open the valve on the end of the hose.. open the bottom metering valve a little and gradually close the top bypass valve. The balance between the bypass valve and the metering valve seems to be the tricky part. when they are right it really cuts thru paint and rust. Dont try to control with the valve on the end of the hose.. It will just eat the valve in minuites..

good blasting

Carol

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raymond bagwell

06-23-2005 10:05:05




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 Re: Sandblast pressure pot problems... in reply to Jay87T, 06-22-2005 17:08:05  
If you shake it you are shaking the sand down to the bottom of the takn. I imagine the pot is going dry at the bottom. I have to do this when mine gets low.



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carol Martin

06-23-2005 07:05:01




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 Re: Sandblast pressure pot problems... in reply to Jay87T, 06-22-2005 17:08:05  
I have one that I got from HFT. It took me a while to get all the adjustmens down but then it works great. I use just plain Mortar Sand that is WELL dried and sifted. start with the main input valve and the bypass valve on the top open when the pressusre is built up. fully open the valve on the end of the hose.. open the bottom metering valve a little and gradually close the top bypass valve. The balance between the bypass valve and the metering valve seems to be the tricky part. when they are right it really cuts thru paint and rust. Dont try to control with the valve on the end of the hose.. It will just eat the valve in minuites..

good blasting

Carol

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Jay87T

06-23-2005 12:08:13




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 Re: Sandblast pressure pot problems... in reply to carol Martin, 06-23-2005 07:05:01  
ok thanks, I think my problem is my valves arnt set right after looking at the blaster I think you are right if Im running it will all the air wide open its probly not letting the sand drop fast enough at the bottom and is just shooting air. I`ll have to try that.



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Rod (NH)

06-22-2005 18:59:55




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 Re: Sandblast pressure pot problems... in reply to Jay87T, 06-22-2005 17:08:05  
Hi Jay,

The valve at the bottom of the pot that feeds the blast material into the air stream usually should not be fully open. If it is, too much material is fed to the nozzle and it will clog. On mine, I only open that valve about half way - after establishing full air flow to the nozzle. I'm not sure this could be your problem but you might want to try it to see if it helps. Also make sure there's no moisture at all in the tank, the blast media or in your air supply.

I suggest that you consider losing the silica sand and using Black Beauty sandblast grit instead. Being a low free silica product, the grit is a lot safer healthwise plus it cuts better and lasts longer. Yes, it's more expensive, but well worth it.

third party image Rod

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old

06-22-2005 18:07:24




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 Re: Sandblast pressure pot problems... in reply to Jay87T, 06-22-2005 17:08:05  
I have had the same problems with the one I have. I gave up on it and went to wal-mart an got one of there siphone ones and haven't used the other one since.



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