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5HP 2 stage Quincy compressor at rural king

#82
That is the basic rule Shine. "Water will not drop out until the air is cooled". That chiller would work well for a hobbiest on a budget to get dry air to spray a car.

I have a 40lb dessicant tower that I used to use to cool/dry the air. It was constant maintenance because all of the water was dropping out into the beads. Now it is used at the end of the compressor system and beginning of the shop piping. I change the beads once a year and it's a waste because they aren't wet anymore. Through a large aftercooler and two tanks the only water I get if from the bottom tank drain. I also built my daily compressor to run at 425 RPM's so that has helped also.
 
#83
that chiller lets me blast during the summer . with the heavy suit , gloves and hood it is miserable in high temps . with cool air in the hood our body doesn't know it's hot :) i plan to find an ice machine before next summer. fill it with ice instead of water .
 
#84
I came out of the tank and have 4 copper made water traps with valves at the bottom to release water throughout the day if need be, I ran 3/4 copper 40 feet around the wall to two separate drops. One drop has a water separator and 1/2" hose to run all tools, The other line has a water separator and desiccant filter and is only used to run spray guns. I have had no problem with water when painting, I run all this with a CH 80 gallon 27 cfm compressor. The older painter friend told me to do it right the first time and be done with it, This is how he had me set up and so far it has been great.

yeah, maybe the copper is the way to go. I haven't figured up cost for all that yet. Also I'm wondering if I even got the right compressor. I'm only going to have 17. 3 CFM. I don't know if this will be able to keep up with the light sandblasting I8 will need to do from time to time. Probably not. I wonder if I should have got Quincy's seven and a half horse single phase two stage compressor. Looks like it runs about $1, 000 more. But if it's a once-in-a-lifetime cost, that's really not that much. That also being said, this qt-5 is a lot more horse in compressor than we already had and we'll do a lot more. It's also more than we need for 80% of the jobs that we do.

EDIT: Rural King has the qt-7.5 for only $600 more than I paid for the qt-5 from them ($1800). I'm thinking I need to do an exchange. Some of the qt-7.5 listings mention that the compressor is "splash lubrication" while others do not. What does this refer to? The one with the after cooler is $2800. Northern tool has the same prices and will deliver for free!

EDIT 2: according to this chart the upgrade to the 7.5HP compressor won't help me much, but idk how closely this representative real life. It doesn't take into account what I'm willing to accept as far as waiting on the compressor to catch up and how long I'm willing to wait for it to catch up either. I have a friend that has the 7.5HP quincy. He redoes cars. He says he blasts with it and doesnt ever have to wait on it. He says there are times it will run constant but catches up fast. Not sure what tip he's using on his blaster it at what PSI.

https://www.pittsburghsprayequip.com/2016/03/21/choosing-an-air-compressor-for-sandblasting/
 
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#85
I just finished building my compressor after the original Craftsman pump failed. I used the original Craftsman tank but replaced everything else.
The knock-off China 707 Saylor-Beall pump is "splash lubrication" .
I use all 1" copper pipe, about 60', and it works great and is easy to route and solder together.
20180724_172614.jpg
 
#87
learn to blast at 35 lbs and your compressor will not have to work so hard .
In your opinion is the QT-5 enough compressor then? What do you mean "learn to blast" at 35psi? Does this require some extra sort of skill or discipline? Or do you just mean blast at 35psi period?

Nice setup mustang408? Do you have that wired with a 60A fuse and #10 wire as suggested by NEMA charts? Just curious how closely everyone follows those. I thought a 60A fuse was a lot and I went to 40. The old compressor wasn't fused high enough by the standard charts and it never kicked out. I'd rather the fuse kick out too easy than burn the wire and building down.
 
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#91
Just curious Shine, I know you have a large compressor available, but what CFM are you using at 30 PSI

I like to know this also. Does anyone have any input on whether or not I should exchange the 5 horsepower compressor for the seven and a half? It can provide an extra 6 CFM. Me thinks that that's worth the hassle of putting the thing back on its pallet and running it back to the store foreign exchange.
 
#93
i have 185cfm . i blast at 35-45 lbs . have no idea what cfm is coming out at low pressure but cfm has little to do with blasting .
there is no reason for excessive pressure when blasting. unless your doing cement trucks or water towers . you need only enough to remove paint and rust. less pressure - less peening - less chance of warping .
 
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#94
i have 185cfm . i blast at 35-45 lbs . have no idea what cfm is coming out at low pressure but cfm has little to do with blasting .
there is no reason for excessive pressure when blasting. unless your doing cement trucks or water towers . you need only enough to remove paint and rust. less pressure - less peening - less chance of warping .

I'm thinking I'll exchange the thing. For $600 extra and for something I'll hopefully never have to do again that seems like a small price to pay.


185cfm?! That's gotta be 3 phase right? How many HP?
 
#96
i have 185cfm . i blast at 35-45 lbs . have no idea what cfm is coming out at low pressure but cfm has little to do with blasting .
there is no reason for excessive pressure when blasting. unless your doing cement trucks or water towers . you need only enough to remove paint and rust. less pressure - less peening - less chance of warping .
That unit will support a nozzle that will get-r-done in no time, even at 35 PSI, but most of these guys only have 18 or 19 CFM
 
#97
you still only need 35 lbs. 90% of people who buy small blasters do not know how to use them .
less media cuts better . you have to have slightly more pressure in the tank than the hose. too little the media will not fall into the stream , too much it will fill the hose .
 
#99
I suspect it is the same pump. They use a different pulley to spin the pump faster to gain the extra CFM. It takes more HP to spin the pump faster, thus upping to a 7.5 hp motor.
 
I suspect it is the same pump. They use a different pulley to spin the pump faster to gain the extra CFM. It takes more HP to spin the pump faster, thus upping to a 7.5 hp motor.

Doesn't that induce more hest too? Is it really that much better? I guess the CFM is the gain- which is important. Ok. I'll get it!
 
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