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Old 02-24-2010, 08:09 PM
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Nozzles and equalized pressure

Originally Posted by shine
there has to be equal pressure in the tank and hose. if not the media will fill the hose ( too much tank pressure ) or it will not fall into the stream ( too much hose pressure )if you are wearing out the media valve you are blasting with the tank instead of the hose. too much pressure behind the media in the tank. hose nozzles are consumables . they wear out period. mine are 3/8 x 1 1/4 , buy a couple of those.
(Sorry for the ignorant comment, but...) Are you saying that using 3/8" nozzles will in some way help equalize pressure between the tank and air line, or that those nozzles just work best for you (because they don't clog very easily?)?

After installing the extra valve on the split that goes into the tank, I suppose I could try partially closing the valve to the tank?

Thanks for your input.

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Old 02-24-2010, 08:22 PM
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HF blasting pot probs

Two things I forgot to mention - I'm running the pressure at 115 psi, and I'm also using a Harbor Freight Deadman nozzle like the one in the picture. Any comments on this pressure?
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Old 02-25-2010, 09:37 AM
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my unit is rather large. 185 cfm diesel compressor and 6.5 cuft hopper with an 1 1/4 hose. but i only run 30 lbs of pressure. you really need to separate the 2. have a reg on the hose supply and the tank. if you can get it equal or within 5 lbs more in the tank it will work fine. if you have 100 lbs in the hose and 30 in the tank the media will not fall into the stream. it will stay put. you can beat the crap out of it and get a little in but not much.
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Old 02-25-2010, 02:00 PM
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thanks shine, I guess I will pick up another regulator before I use my blaster
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Old 02-25-2010, 03:51 PM
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your drawing/accumulating moisture down thru the sand constantly to the bottem where it "cakes" the sand and makes a "bridge" clog at the tank exit...

sand is hydroscopic so it is forever to get it dry again so if it does bottem clog we dump it and use new...
(if it is a damp day we only put a small amount in the tank so it will get run out before it can get damp)...
FL humidity=we have to store the sand and the blaster with the top open in the hot as hell compressor room to keep all reasonably dry when stored...

we have 2 huge master air accumulation tanks in series with huge dryers on both before it's fed to the shop and we still have to try only to blast after 10am due to humidity...
we have a small dryer/accumulator at the blast tank only to know no moisture is coming thru the line...

what will help you is if you can rig the compressor with a air intake hose/tubing set up to a dry air source,,,the shop compressor is routed to a attic that does stay temp/low humidity stable (also helps for less moisture thru your gun and air tools) "aka" solve the problem at the source!

lol,,,,we tried a much larger ball valve on the bottem,,,all it did was move the clog to the bottem of that valve!!!

cboy has got a great idea....
but we use a baseball bat!!!!
you get to vent your frustrations!!!!!
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