Products FAQ

An appropriate selection is beneficial to both the end-user and the compressor equipment. A too-large selection is too wasteful. A too-small selection may lead to the compressor in a long-term loading state or insufficient airflow or pressure.

The pressure and flow requirements for your facility are essential when choosing an air compressor.

What amount of pressure do I need?

First of all, confirm the Air Pressure you need for the end production line, then plus about 1~2bar. The 1~2bar is for pressure loss:

• The distance from the installation site to the actual gas-side
• The size of the pipe diameter
• The number of turning points

So, we can install the air compressor to the air end as near as possible. If the distance between the air compressor and the air end pipe is too far, the path of the main pipe should be enlarged.

What is the right airflow for my compressor?

First of all, confirm the Air Flow of all the air-consuming equipment, then increase by about 20 percent.

• For a new project, it can be chosen based on the flow value provided by the design institute.
• For a renovation project, we can reference the original parameter values, in combination with actual air usage.
• To supply compressed air to your main equipment, learn the parameters of the air compressor from your supplier.

With constant power, when the rotation speed changes, the flow and pressure also change.

For example, a 22KW air compressor:

• when the pressure is determined to be 7 bar, the airflow is 3.7 m3 / min.
• when the pressure is determined to be 8 bar, the airflow is 3.4 m3 / min

The speed must be reduced when the air pressure is increased, otherwise, the drive motor will be overloaded, so the airflow is also reduced accordingly.

Thus, the steps for selecting an air compressor are: first, determine the working pressure, then the corresponding volume flow, and finally the power.

First of all, we should know which contaminants can we find in compressed Air?

Compressed air contains substances such as water, oil, and dust. That may contaminate the final products and even increase costs.

So we should choose an oil-free or oil-lubricated type air compressor first, then use air treatment such as dryers and filters to produce the dry and clean compressed air to meet your needs.

The difference is the oil content in compressed air.

• For the Class 0 oil-free air compressor, we use water as the lubricating medium instead of oil, so there will be no oil at all.
• For the oil-lubricated air compressor, we use oil as the lubricating medium, so the compressed air will contain oil. But the use of filters can reduce the oil content down to 0.003 microns.

First of all, assessing your facility’s needs.

If your plant can’t tolerate any oil in contact with the product, choose a Class 0 oil-free air compressor is a must. Such as pharmaceutical, food & beverage, hospital, critical electronics, and other industries. To ensure that there is no chance of contamination by oil.

But, if there is no need for 100% oil-free, the majority of manufacturing, industrial or small workshops use oil-lubricated compressors. Although there is oil in compressed air, they use filters to reduce the oil content. Because it will be more economical.

For the oil-lubricated type air compressor, we can find oil and particles in the compressed air. We can use filters to reduce the oil content and particles.

• C grade air filter: Liquid Separator Filter (Oil content:5ppm , Particle:3μ)
• T grade air filter: Particulate Filter (Oil content:0.5ppm , Particle:1μ)
• A grade air filter: Oil Remover Filter (Oil content:0.01ppm , Particle:0.01μ)
• H grade air filter: Charcoal Filter (Oil content:0.003ppm , Particle:0.01μ)
• F grade air filter: High Efficiency Oil Remover Filter (Oil content:0.001ppm , Particle:0.01μ)

All atmospheric air contains water. And when the air is compressed, the water concentration will increase. To avoid future problems in the compressed air system, the wet air needs to be treated by using drying equipment.

Dew point is a measure of the amount of water vapor in compressed air. In other words, the colder the dew point, the less water there is in the compressed air. Simply, it’s the temperature at which water vapor condenses into water.

Air dryers can help lower dew point temperatures and keep liquid water out of air compression systems. Selecting the right dryer to treat wet compressed air is dependent on the requirements of the machines that use compressed air.

Most industrial and manufacturing facilities can achieve such requirements with a refrigeration air dryer.

While some pharmaceuticals plant, medical operations, laboratory users need an adsorption dryer to supply critically dry air.

• Refrigeration air dryer (Dew point: 2~10℃)
• Heat Regeneration Adsorption Air Dryer (Dew point: <-25℃)

For the costs, the lower the dew point required, the higher the investment and operating costs for air drying.

The VSD(Variable Speed Drive) air compressor uses the variable frequency inverter compared with the regular Fixed speed air compressor.

the advantages as follows:

• Achieve constant pressure air, provide stable air source for users
• Stable start reduces the impact on the power grid, extends the mechanical life of the motor and the whole unit
• Adjust the airflow as the actual needs
• Energy-saving about 20%

If there is fluctuation in flow demand between shifts, choosing the VSD air compressor will be a good option and offer great savings.

For most small models, it is better to use the air cooling type air compressor. There are four shortcomings of Water cooling type air compressors:

• It needs a water supply and discharge system, which requires a large investment;
• The life of water-cooling coolers is short;
• In the winter, it is easy to freeze;
• It needs a large amount of water during normal operation.

But for the large models, it needs to use the water cooling type air compressor to ensure high cooling efficiency.