Difference between Single-Stage and Double-Stage Compressors

This post mainly focuses upon the main differences between single-staged and two-staged compressors.

The easiest way to differentiate between both these versions is by determining the number of times, they compress the air. In the single staged version, the air is compressed once and in the double staged version, this happens twice. 

1 -  In the single-staged version of piston compressors, air is drawn into the cylinder and compressed in a single-piston stroke to a pressure of approximately 120 PSI. It is then sent to the storage tank and a point worth knowing is that all rotary compressor for sale Sydney are single-staged machines.

2 - On the contrary, in the double staged version, the first step is exactly the same except that the air is not directed to the storage tank. It is then sent to another smaller high pressure piston with the help of an inter cooler tube. There, it is compressed to a pressure of more than 175 PSI and sent through the cooler towards the storage tank.

3 - Often, it is seen that the buyers are confused by the fact that piston compressors have two pistons and are therefore two-staged version. However, it is important to know that most single staged pumps are twin cylinder design as this way; it is easier to balance than a single piston version. Another point worth-knowing is that if the cylinders are the same outside diameter, it’s a single staged version.

4 - In the dual stage pump, the first stage cylinder is always of a larger diameter and the dual stage pump will always have an inter-cooler tube. There can be a finned housing as an alternative, attached to the pump to cool the air before it is compressed for the second time. The high pressure allows greater storage in the tank and an 80 gallon receiver tank has the capacity to hold 83 cubic feet at 100 PSI. Similarly, the same tank can hold 120 cubic feet at 150 PSI.

5 - Another very important fact about two stage compressor for sale Sydney is that it can easily maintain the header pipe pressure of more than 125 PSI. If seen from a technical point of view, it is ideal in order to have 90 PSI at the end of the hose for the air tool inlet. 

6 - On the other hand the single stage version used for paint protection will let the heard pressure drop below 90 PSI. This pressure can drop to as low as 70 PSI and this put a significant impact upon the performance of the tools that are running with that air. 

• Simple to work on

• Cheaper to replace

• Readily available for repairs

• On/off control

• The unit must run at full capacity even if only a small amount of heat is needed

• Greater control

• Greater humidity control

• The first stage could be used on low needs days and save energy

• Greater efficiency

• Higher cost

• More complicated to repair or replace

• More complicated refrigerant charging process

• Not readily available to replace and may have to be ordered

Cameron Amelia is associated with VG Auto Paints & Tools, a company offering reliable solutions for auto paints & tools. The products & services of the company include paint protection, Compressor for Sale Sydney and automotive paint