Using single stage and dual stage compressors in parallel

[md21722]

Hi all,

I have 2 x 8.4 CFM @ 100 PSI and 1 x 6.4 @ 90 PSI single stage compressors. With 98 gallons total reserve, they will go from 100-130 psi in about 85 seconds. I am thinking of replacing the smallest with a new dual stage compressor in the 15-18 CFM range.

There are two ways I see to use both the single and dual stage together:

1. Set the dual stage to 100-130 psi like the single stage

2. Get fancy with check valves, regulators, etc.

I am wondering if anyone has gone through this before. It seems like running the dual stage at lower pressure is the easiest way, but then I would lose the extra tank reserve.

I have thought of:

1. Simply putting a regulator on the dual stage tank output and then running that into the existing single stage supply with another water separator and regulator. This way one regulator sets final tool pressure and the dual stage can never overpressure the single pressure system.

2. Run both into a T with a check valve on the single stage side so that over pressuring cannot occur. Caveat would be until the dual stage tank runs lower than the single stage, the single stage will not be providing any airflow.

3. Run both single stage with regulator and water separator and check valve; and dual stage with regulator wand water separator into a T to provide final pressure to tool.

Any comments?

 

[larry_g]

What is the working pressure of the TANK on the single stage?

What is the max pressure of the single stage?

What is the pressure you plan to run your piping system at?

The above will help make some decisions. You really do not have to run the single stage till the two stage runs out of air. If the two stage is run at 130 to 160 psi you can run the single at 125 to 140 psi. ONLY if the working pressure of the smaller tank is ok with this. So answer the above questions and we'll have some better options.

lg
no neat sig line

 

[md21722]

I run the single stage as cut in 100 cut out 130. Single stage compressor output rate falls after 110-120 so I don't want to increase the pressure of the single stage system.

 

[larry_g]

I run the single stage as cut in 100 cut out 130. Single stage compressor output rate falls after 110-120 so I don't want to increase the pressure of the single stage system.

You didn't answer my questions....

lg
no neat sig line

 

[md21722]

What is the working pressure of the TANK on the single stage? 130

What is the max pressure of the single stage? 130

What is the pressure you plan to run your piping system at? As low as possible, not less than 105.