The main function of the air storage tank in the air compression system is to ensure the stability of the air supply. The compressed air deposits water in the air storage tank adjusts the air pressure fluctuation of the pneumatic equipment due to the unbalanced air consumption, increases the pressure stability of the air equipment, or reserves a part of the compressed air so that the user can use it when the air compressor fails. This part of the compressed air is used for emergency treatment of pneumatic equipment or pneumatic control systems.
Selection of gas storage tank
1. Pressure selection
According to the different pressure of the gas storage tank, it can be divided into the high-pressure gas storage tank, low-pressure gas storage tank, and normal pressure gas storage tank. Optional gas storage tank pressure
As long as it is greater than or equal to the exhaust pressure of the air compressor, that is, the pressure is 8 kg, and the pressure of the air storage tank is not less than 8 kg;
2. Volume selection.
The volume of the optional air storage tank is about 0.3-0.5 of the air compressor displacement; if the environmental conditions permit, you can choose
The large-volume air storage tank helps to store more compressed air and better pre-dewater.
Example: If the air compressor displacement is 1 cubic meter per minute, the pressure is 8 kilograms. According to the calculation formula for the selection of the gas storage tank, the
Volume = the range between the displacement of the air compressor * 0.3 or the displacement of the air compressor * 0.5, (not less than one-third or one-fifth of the exhaust A volume), the recommended volume is 0.3 cubic or 0.2 cubic gas storage tank; if the gas consumption still needs to be increased in the future, the volume of the gas storage tank can also be appropriately enlarged, such as 0.5 cubic, or 0.6 cubic, or 1 cubic, etc.;
3. Material selection
The gas storage tanks can be divided into carbon steel gas storage tanks, low alloy steel gas storage tanks, and stainless steel gas storage tanks according to the different materials selected. They are used in conjunction with air compressors, refrigeration dryers, filters and other equipment to form industrial production. Compressed air station on the power source. Most industries choose carbon steel gas storage tanks and low-alloy steel gas storage tanks (the yield strength and toughness of low-alloy steel gas storage tanks are higher than carbon steel gas storage tanks, and the price is relatively higher); stainless steel gas storage tanks Cans are mainly used in the food industry, medical and pharmaceutical industry, chemical industry, microelectronics and other equipment and parts industries that require high comprehensive performance (corrosion resistance and formability). Users can choose according to the actual situation.
The service life of the gas storage tank
The gas storage tank is special equipment, and the manufacturer will give a recommended service life, which is basically 10 years at present. This does not mean more than 10
The year-old gas storage tank cannot be used. If it is more than 10 years old and has been submitted to the Quality Supervision Bureau for inspection every year and passed the inspection, it can also be used. However, it cannot be used if it has been used for less than 10 years but fails to pass the inspection. The specific inspection results of the Quality Supervision Bureau are used to determine whether it can continue to be used. It is recommended to use regular large-scale well-known brand gas storage tanks.
-Generally, those below 1 cubic meter and ten kilograms (including ten kilograms) are classified as simple pressure vessels and are exempt from national inspection. On the nameplate of the gas tank and
The product quality certificate. The simple pressure vessel is stated on it, and it can be exempted from inspection within 7 years of validity, and registration is not required. The attachments are inspected according to the regulations of the quality supervision bureaus of various places.
For gas storage tanks of more than 1 cubic 16 kilograms, you need to go to the local quality inspection office to apply for inspection. Not only is it necessary to apply for a special equipment use registration certificate,
And you also need a unit with installation qualifications to install it.
The difference between the gas tank connection port.
There are two ways to connect the air inlet and outlet of the gas storage tank, one is a thread, the other is a flange.
1. Threaded connection
The threaded interface is a thread-tooth type, which is suitable for connections with a relatively small diameter. Rp is the unit, and Rp means internal thread. Such as
Rp1/2 means that the threaded interface of the gas tank is one and a half inches of internal thread, and Rp2 is two inches of an internal thread. The dimensions of the threaded interface are 1.5 inches, 2 inches.
2. Flange connection
The flange is in the unit of DN, which refers to the nominal diameter of the pipe, also known as the nominal diameter. For example, DN50 is nominal diameter of 50mm.
When connecting, fix the pipeline on different flanges, add flange gaskets in the middle, and then connect the two flanges with bolts. The flange connection is convenient to disassemble and the sealing effect is better than that of the thread. Generally, flange connections are used for larger diameters. The dimensions of the flange interface are DN80, DN100, DN125, DN150. These are conventional, and there are non-standard ones, such as DN200, DN300, which are non-standard.
Not all specifications of gas storage tanks have threaded and flanged interfaces, and there is no specific basis for choosing flange or threaded interfaces.
It depends on the size of the air compressor interface.
