Quincy 230 roc28

[TonyJ]

Hello everyone I’m new here and this will be my first and certainly not my last post. Thanks for having me.

I have a Quincy 230 roc 28 compressor that was bought back in 1963 by a water treatment plant and from the day it was installed to about a month ago it was ran about 18 hrs a day to only supply air to a 60,000 gallon tank or water for mixing with air diffusers installed on a drop pipe inside the tank. Therefore it has never actually built up air pressure in its life.

I got it when they decided to finally buy a new compressor because the Quincy was finally not supplying enough air anymore so I took it home and found that the check valves ( 2 intake and 1 exhaust) were shot. Other exhaust valve was still good but I replaced all 4 anyways.

Question I have for you all that may know about the 230 is how high of psi can or will it safely put out. I know it’s only rated at 100 psi but I’m currently running it at 150 cut out pressure and it sounds the same while running at 50psi as it does at 150psi and also the motor amperage doesn’t change while running except for maybe 1-2 amps. Also the one I have is the old style pump that has the pump fins that runs up and down and not side to side like the later model 230’s have

 

[B_Bimmer]

150 is a little high for a single stage, they are generally happier at 135 or so max. I have a 230 as well, nice little compressor.

 

[TonyJ]

150 is a little high for a single stage, they are generally happier at 135 or so max. I have a 230 as well, nice little compressor.

I thought about lowering it a little bit but with how it sounds and the running amps being basically the same @ 130 and 150 I can’t see where a problem would arise. Also with so many of the parts being shared with the 240 and also the 325 which goes to 175 it really makes me wonder what the compressor will really handle with no problems.

 

[TonyJ]

I thought about lowering it a little bit but with how it sounds and the running amps being basically the same @ 130 and 150 I can’t see where a problem would arise. Also with so many of the parts being shared with the 240 and also the 325 which goes to 175 it really makes me wonder what the compressor will really handle with no problems.

I also made the changes from original design to remove the aftercooler pipe and install a in tank check valve ( no check valve in original design) with the unloader port and I use both the unloader port with my pressure switch and also the factory hydraulic unloaders also I’m running the factory pulleys except I changed out from a 5hp 3 phase to a 5hp single phase and it was already set up to be running at 900 rpm

 

[MacMcMacmac]

You won't break it running to 150 it just gets very inefficient and hot.

 

[The Tool Tyrant]

Looks like the ROC 28 was a one year (1963) model as ROC 30 was in 1965.

I couldn't find any performance specs for the 230, but the specs for the later 240 state "Maximum Continuous Pressure: 100 PSI", "Maximum Intermittent Pressure: 100 PSI"

 

[B_Bimmer]

You won't break it running to 150 it just gets very inefficient and hot.

Exactly, unless you actually need 150 it just doesn't make sense.

 

[TonyJ]

Exactly, unless you actually need 150 it just doesn't make sense.

I use it for a home shop but I use 1/2” impacts and die grinders and grinders and mainly the die grinders and regular grinders perform much better at 120-150 range. If I go say 90-125 they just don’t perform as well. At 120-150 setting it only runs for 2.5 minutes and shuts off and at 90-125 it runs constantly while I’m using the grinders

 

[TonyJ]

Looks like the ROC 28 was a one year (1963) model as ROC 30 was in 1965.

I couldn't find any performance specs for the 230, but the specs for the later 240 state "Maximum Continuous Pressure: 100 PSI", "Maximum Intermittent Pressure: 100 PSI"

Yes Quincy also told me it was a 1963 model and said 24.8 @ 875 rpm with 5 hp motor