Two Stage vs Single Stage or 2 Compressors HVLP

[cturboaddict]

So, it's finally time to get a bigger compressor. My lil ancient 1.5hp 15gallon craftsman just isn't cutting it anymore.
So, I'm looking at a 60gallon stationary or possibly a piggy back 2 30gallons?

Mainly I run all electric Milwaukee stuff for my power tools. But I'm in the middle of a restoration of a 37 Plymouth. I need to occassionaly spray HVLP for primer, and run some small die grinders/small angle grinders.

For the 60gallons I'm torn between 2 models I can afford. One is a single stage, the other is a two stage. The Single stage offers better CFM at 40psi (thinking of HVLP), vs the Two stage.
Single Stage-
https://www.menards.com/main/tools/...7-c-12910.htm?tid=4027458507312974031&ipos=10
Two Stage-
https://www.lowes.com/pd/Kobalt-60-Gallon-Electric-Vertical-Air-Compressor/1000542193


Then the thought came to me, maybe I could run 2 30gallons to double the CFM? Would that work as well? Or am I just asking for trouble here.

Ultimately, I would of rather had the new Eastwood Scroll compressor, but I just can't swing almost 2grand on a comp right now.

Any thoughts???? Why would the single stage have a higher cfm than the two stage? Would the two stage be better than the single?

 

[larry_g]

Look very closely and you will see that neither has a flow spec at the same pressure as the other, so you have to interpolate. In actual use I doubt that you could tell one from the other. Both have near the same flow at 90-100 psi so they will be close throughout the pressure curve.

lg
no neat sig line

 

[cturboaddict]

Look very closely and you will see that neither has a flow spec at the same pressure as the other, so you have to interpolate. In actual use I doubt that you could tell one from the other. Both have near the same flow at 90-100 psi so they will be close throughout the pressure curve.

lg
no neat sig line

Oddly the Kobalt is only 11.4@40psi, and the Masterbuilt/Husky/China is 13.4@40psi.

 

[seber]

You don't run it at 40 psi. Comparison should be at 90. As said before they are almost the same at that rate. The higher pressure has two advantages. Higher pressure can really hammer some things when you need it. The more useful thing is that you can store more energy at higher pressure. That means when you get into a situation in which your compressor is marginal you will have more reserve.

 

[cturboaddict]

Thanks. Plans may have completely changed after I spotted a
Ingersoll Rand Type 30 7.5-HP 80-Gallon Two-Stage Air Compressor on CL for $600.
That should be well beyond what I need at 24cfm at 175psi.

 

[redmondjp]

Thanks. Plans may have completely changed after I spotted a
Ingersoll Rand Type 30 7.5-HP 80-Gallon Two-Stage Air Compressor on CL for $600.
That should be well beyond what I need at 24cfm at 175psi.

If that doesn't make any funny noises while starting up from zero pressure and it has a single-phase motor on it, you should already be there picking it up! Heck, even if it did have a 3-phase motor, you could spin the pump slower and install a 5HP single-phase motor on it for about $500 (motor + starter).

 

[mike93lx]

Thanks. Plans may have completely changed after I spotted a
Ingersoll Rand Type 30 7.5-HP 80-Gallon Two-Stage Air Compressor on CL for $600.
That should be well beyond what I need at 24cfm at 175psi.

How big is the electrical service in your shop? Start up on a 7.5 is not insignificant

Also, open the drain when you look at it. If a ton of nasty water comes out, it means they weren't regularly draining it and it might be worth thinking about passing. A failure on a tank that big would be worse than catastrophic

 

[cturboaddict]

How big is the electrical service in your shop? Start up on a 7.5 is not insignificant

Also, open the drain when you look at it. If a ton of nasty water comes out, it means they weren't regularly draining it and it might be worth thinking about passing. A failure on a tank that big would be worse than catastrophic

My buddy is stopping there tomorrow. the guy is holding it until then.

100amp sub panel.

 

[cturboaddict]

And its single phase on the motor. My plan is 100% I'm buying it if it's not wrecked. My machinist is stopping to check it out for me tomorrow.

 

[redmondjp]

And its single phase on the motor. My plan is 100% I'm buying it if it's not wrecked. My machinist is stopping to check it out for me tomorrow.

The motor and starter alone are worth the asking price!

 

[cturboaddict]

Well the Ingersol Rand arrived Saturday, and I finished my first version of all of the piping. HOLY MOLY this thing is a beast!! It's loud, but not as loud as my old Crafstman 1.5hp home jobber. Now to start tweaking it a bit more.
24cfm at 175psi is amazing!!!!!!!!!!!