I have a 6 hp 60 gallon compressor. Max. pressure is 125psi. The compressor will run up to 125 no problem. I have a maxus 6za39 sandblaster pot with a water trap and pressure gauge. Max. pressure on this is 125 psi as well. Today. I cleaned out the Maxus, ran the compressor up to 125 and hooked up the Maxus. When I opened up all the valves the Maxus pressure only went to 50 psi. Anyone have any idea on why it only went to 50psi.
I kept opening the blaster nozzle and it would drop a tad below 50 but never more than 1-3 psi and as soon as I let off it would go right back to 50. The pot was empty when I did this. Should that make a difference or is 125 psi max for a compressor not enough?

 

20 views and nothing???

 

I've got a 125 psi compressor from H.F. I also have their sand blaster that requires 125 psi. I had to play with the valves a bit, now they work well together. Well at least for what I need. The compressor can't keep up for long periods and that sucks. I usually get one headlight bucket done then have to wait for pressure to build back up. This set up is not for big jobs. Like I said, it does what I need and that's it. Sorry I can't help anymore.

 

Bad/faulty gauge on one or the other?
Inlet hole to gauge partially plugged?
Water filter plugged?
IMHO, pressure is secondary, CFM is primary.

Dan

 

100% on that!
When ever sizing an air compressor find the tool that uses the most CFM, in this case the blaster. See what that CFM is @ what PSI then add a little more CFM to that for sizing compressors.
You also need to have dry air for blasting. This drier also needs to be sized for the PSI the you work at but mostly for the CFM that will pass thru it.
You cant have a drier / filter work at 85% with say 25 CFM and you are using 35 CFM as that % will drop a lot and just not work.
You can help that drier by building a drier / cooler. Just Google air driers and you should find a few. Then add the filter / drier just before the blaster.

I don't blast (yet) but I do use a lot of air when doing body work, air sanders & grinders, on my projects. I was getting water pouring out of the tools and that is not good for the tools so I made a drier.
I used baseboard fin tube tubing, a few fittings and I have a drier that works great.
Air come in on the bottom left, goes up 1 fin tube, down the next and at the bottom 1 of 2 drip legs, back up and back down where I pull air out in the middle of the tube to my shop loop, at the bottom of that last tube is the 2nd drip leg.

My shop loop runs around the top of the shop with 5 drops and each drop also has a drip leg.

One of the hose drops with drip leg.

I built and used this drier in a small 1 car garage and where it was placed it did not get air flow thru it so could not cool the air, had water at tools again. My fix back then was to set up a box fan blowing air across the fins and it worked as it should.
So far being a little more open area I have only gotten a little water at 1 of the hose drop drip legs. If I was to get more water I would set up a box fan to blow air across the fin tube drier to make it work better.
BTW being an ex-body man I know you need air for tools. That compressor came out of a 5 bay truck garage so more than big enough CFM wise, for just me in my 3 car bay garage using any of my air tools even painting. Compressor was an Ebay find needed a little work but for $1000 total I am more then happy.
Dave ----

 

Dave,

Where did you get the fin tubing? Is that something that I can find at Home Depot?

Joseph