Compressed Air

Compressed Air
A. Air

Ordinary air refers to gas without color, odor or flavor. It is a mixture of many gases and the ingredients and contents shall be as follows:

Percentage of dimension
Percentage of ingredient
Nitrogen 78.08% 75.50%
Oxygen 20.94% 23.14%
Argon 0.94% 1.3%
CO2 0.03% 0.05%
Others (steam, helium, neon,...etc.) 0.01% 0.01%

2. Gas is a kind of material comprising numerous micro molecules, which keep moving in the space.
3. The energy of gas is generated by the movements of molecules. The higher the temperature is, the faster movements of molecules will be.
4. As the temperature increase, the moisture increases, and vice-versa.
5. Due to the earth gravitational force 99% of air is concentrated at the atmospheric layer 32Km above ground.
6. An increase of CO and CO2 will affect the air quality and ease temperature to rise, thus aiding the green house effect.
B. Compression
1. Air elements contained in a cylinder will move within the inner walls. Once dimension of air is compressed and becomes smaller, it will cause accelerated movement of air elements. Increased impact will generate pressure.
2. In the course of air compression, the compression of air element and friction within will increase the pressure and temperature. On the contrary, when air expands it will lower down the pressure and temperature.
3. The lowered temperature and pressure resulting from air compression will cause coagulation and sedimentation of water and impurities; whereas the main sediment will be water, dust/particle, waste oil, rust and acids.
4. SO2 in the compressed air will become H2SO3, which will cause corrosion, and will damage vital parts of the air compressor.
C. Compressed Air System
Clean air is most essential to functions of a compressed air system. Clean air is a better source of power for safe, effective and reliable operation of compressed air system. However, such pollutant matter as oily mud, dirt, rust, acids and water will cause damage to compressed air system and would result in the following severe consequences:

1. Locking of pneumatic controlled instruments.
2. Decreasing the efficiency of pneumatic tools.
3. Wearing at air-tight seal ring and will corrode parts of the compressor.
4. Increasing maintenance cost.

Lowering product quality, adverse impact upon operation of machinery equipment or event to the extent of shut-down of the entire plant.

Typical Compressed Air System

1. Compressor

2. Aftercooler

3. Separators

4. Wet Receiver

5. 3 Valve By-pass

6. Compressed Air Dryer
7. Coalescing Filter
8. Clean/Dry Receiver
9. Particulate Filter
Automatic Drain Valve
To assure smooth operation of an air compressor and pneumatic tools, the following requirements should be strictly observed in operation of compressed air system:

1. Selecting the optimal environment.
2. Selecting the outstanding facilities.
3. Correct layout and installation of the air compressor.
4. Conduct a scheduled maintenance.
5. Filtering and discharge of water and impurities.
D. Discharge of Water and Dirty Scale and Automatic Drain Valve
To keep cleanliness in compressed air system and upgrade quality in the compressed air, you may be required to install filter devices such as a separator, filter, or dryer. However the majority of such filter devices should be installed to the auto drain valve to remove water and impurities, which will not only prolong the life span of filter device but also upgrade efficiency. Therefore, the effective auto drain valve plays a key role in the operation of compressed air system. Automatic drain valve comprises a big variety, such as float ball type, solenoid type, reversed cylinder, sensor type and differential pressure type. However, ordinary drain valve may have such defects as incomplete drainage, congestion by dirt particles, excessive consumption of gas, use of power that will make the system vulnerable to malfunctions.
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