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Moisture in air

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Cliff

01-06-2002 11:55:43




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I bought a new sand blaster, but am having lots of trouble with moisture getting in it and clogging it up. I checked on an air dryer for the 1-inch hose on my 7-horse compressor, and they wanted $400 for it. Anybody got any ideas on a cheaper way to dry the air, without too much restriction? Thanks in advance.




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Franz

01-08-2002 17:20:38




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 Re: moisture in air in reply to Cliff, 01-06-2002 11:55:43  
Build an aftercooler/water seperator from 3 feet of 2" pipe, and install it between the compressor and the tank.
Drain the aftercooler frequently.
Problem solved.
If not, add a second aftercooler just ahead of the sandblaster.



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Ron Bullard

01-08-2002 16:41:31




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 Re: moisture in air in reply to Cliff, 01-06-2002 11:55:43  
Kind of an obvious thing but, are you keeping your tank drained as well as you should? If you leave water in your air tank, it will make it down the hose!



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bill b va

01-07-2002 11:07:44




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 Re: moisture in air in reply to Cliff, 01-06-2002 11:55:43  

well you could make a moonshiners condenser pretty easy .... a coil of tubing in a tank of running water.... to make one wrap copper tubing around a cylinder of a size that will fit inside a drum , barrel or tank you have to form the coil .... remove cylinder.... put a inlet and outlet for running water in the tank at top and bottom ,.... put coil in tank.... use bottom for the inlet water and top outlet for the drain .....you will need to connect a drain line to the coil that can drain into a small tank that will be under pressure to collect the condensate ....this tank will need a valve to periodoctily drain the condensate .....this tap will need to be at the bottom of the coil before it goes up and out of the water tank ....you may want to do some research on your 1" hose . i dont think you need that much with a 7hp compressor . granted your tank will help carry you for a short periods . what size is your sand blaster nozzel? some where i have a chart that tells CFM of air flow at different pressures through a orfice . with that information your supply line size can be determined .

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Rory

01-06-2002 13:14:26




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 Re: moisture in air in reply to Cliff, 01-06-2002 11:55:43  
Cliff,
One of the easiest ways to remove water from air lines is to cool the air and condense the moisture out of the line. One way is to create a long run of piping to allow the air to cool before reaching the gun. To do this I run PVC around the top of my shop walls (you want approx 100 ft) I start out at the top of the wall and slope the line as it circles the shop. Install down tubes to get the air down to ground level. Place a 't' at the level you want to make your connections and then add a piece of pipe approx 1 foot long to the bottom of the 't' and add a valve to drain the water from the system. I have drops every 20 feet or so. I use air tools from these ports but paint and plasma cut from the last port only (since that is where the driest air is) I also filter the air as it leaves the port. I crack the vavles at the drop tubes once a month or so but you may need more or less. I like this method because it also gives you convenient air hookups around the shop. Another way would be to use an old refirgerator (working) and carefully drill two holes in the side (be careful of cooling tubes, they are usually in the back but take care anyway) run the piping into one of the holes and build a 'radiator' out of pipe remember to add a long drop tube at the end with a valve so you can drain the condensed water out. And run the the 'out' portion of the pipe through the second hole. In this case you want to allow the air to warm a bit (with a lenght of hose) before spraying or sand blasting.

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