The specs on single vs. two stage on the decent compressors are very similar, especially at 90 or 100 psi, but I am thinking that the headroom of the 2 stage will have a good benefit. My 5hp advertised (3hp actual) 60 gallon compressor died. It was single stage and rated at 50% duty. Die grinders were just about out of power when it turned on at 90 psi at the tank. There was only 30' or so of 3/8" line to the tool and a 1/4" coilhose pnuematics curly hose at the end of that. It would fill to 120 psi and shut off. The compressor was rated at 10 cfm at 90 psi.

I am looking at the PolarAir/Eaton 5hp 60 gal 2 stage. At 145ps shut off, I will have more reserve. It should be easy to get 90+ at the tool. It will turn on at 100 psi, so hopefully I will maintain 90 at the tool, and it will make 19 cfm (double my old compressor) so it can refill the tank quickly. The pump will put out more pressure, but I don't know if the tank is rated more than 145 psi. Maybe the control can be set to come on at 110 instead of 100 psi, but still turn off at 145.

Does anyone know what the PolarAir/Eaton tanks are rated at?

With the specs being so close, and the price pretty close on single vs. 2 stage, I planned to just buy a 2 stage.

Electric tools are more efficient for energy use, but the die grinders are small and light weight. I really love the IR composite 90 degree die grinder with a 3" flap disc for blending small weld areas and corners of metal. The sandblast cabinet beats grinding or any electric method when parts need cleaned up.

On one hand, I don't use air all of the time, but on the other, it has sucked to use my little compressor or the last week. Eaton seems like the best bang for the buck for a home user that might use it once a week, or may end up with a professional/side project that could require it for days in a row. I don't always need air, but when I do, I need a lot of it.

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Working principle and application field of two-stage compressor 'Shared by Sollant

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A two-stage compressor is a commonly used compres sor type and is widely used in many fields. This article will introduce the working principle of the two-stage compressor and its application in different application fields.

First, the working principle of the two-stage compressor

A two-stage compressor is a compressor system consisting of two compression stages. Each compression stage consists of a compression chamber and a drive.
The following is the basic working principle of a two-stage compressor:

First level of compression:

The gas first enters the first-stage compression chamber, which contains a piston and a cylinder. As the piston moves down, gas is drawn into the cylinder, and then as the piston moves up, the gas is compressed. Such compression increases the pressure and temperature of the gas.

Cooling and Separation:

After the first stage of compression, the gas enters the cooler to cool down in order to better handle the subsequent compression process. During the cooling process, part of the water and oil will be separated from the gas and processed by the corresponding separation device.

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Second level of compression:
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The cooled gas enters the second stage compression chamber. Similar to the first stage, gas is drawn into the cylinder as the piston moves down, and then compressed again as the piston moves up. The second stage of compression further increases the pressure and temperature of the gas to the desired working pressure.

Emissions and circulation:

After the second stage of compression, the gas is discharged from the two-stage compressor and treated or supplied according to specific needs. In some cases, the gas may be subjected to a series of cooling, filtering and separation steps to ensure its quality and purity.

Second, the application field of two-stage compressor

Two-stage compressors are widely used in many industrial and commercial fields due to their high efficiency and reliability. The following are some common application areas:
Refrigeration and air conditioning systems:
Two-stage compressors play a central role in refrigeration and air conditioning systems. They provide efficient cooling, enabling air conditioning systems to work at high temperatures and adapt to varying load demands.

Petrochemical:

In the petrochemical industry, two-stage compressors are used to process and compress various gases, such as natural gas, refinery gas, synthesis gas, etc. They are widely used in gas delivery, gas pressurization and gas storage.

chemical engineering:

In chemical engineering, two-stage compressors are used to process and compress various gases and chemicals such as ammonia, hydrogen, chlorine, etc. These gases play an important role in chemical reactions, and the two-stage compressor can provide the required pressure and flow.

Manufacturing and Industrial Applications:

Two-stage compressors are widely used in manufacturing and industrial applications. They are used to provide compressed air for power supply, driving pneumatic equipment and tools, and controlling gas pressure requirements in processes.

medical field:

Two-stage compressors are also used in the medical field, especially in medical oxygen systems. They are used to compress and purify oxygen from the air for use in medical facilities and patients.

In short, the two-stage compressor can provide high-pressure, high-temperature gas through a multi-stage compression process, which is suitable for applications in many fields. Its working principle and wide range of applications provide important compression and processing capabilities for all walks of life, enabling industrial and commercial activities to be carried out efficiently.

The brand 'Sollant' specializes in the R&D, manufacturing, sales and after-sales of compressors, oil-free compressors and hosts, special gas compressors, various air compressors and post-processing equipment. Provide customers with high-quality, environmentally friendly and Efficient air system solutions and fast and stable technical services. Sollant Corporation is customer-centric. Customer satisfaction is the purpose of our Sollant people.
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