What Is a Gas Holder?

Gas storage tank refers to the equipment specifically used to store gas, and at the same time it plays a role in stabilizing the system pressure. According to the pressure of the gas storage tank, it can be divided into high pressure gas storage tank, low pressure gas storage tank, and atmospheric pressure gas storage tank. According to the different materials of the gas storage tank, it can be divided into: carbon steel gas storage tank, low alloy steel gas storage tank, stainless steel gas storage tank. The gas storage tank (pressure vessel) is generally composed of parts and components such as a cylinder, a head, a flange, a pipe, a sealing element and a support. In addition, it is also equipped with safety devices, meters and internal parts that perform different production processes.

Air compressor is one of the important large-scale fixed power equipment in coal mines. It is widely used both underground and on the ground. It is mainly used for air picks, drills and rock drills for mining work. The air storage tank is the supporting equipment of the air compressor. It is installed outdoors. After the air enters the compressor and is pressurized, it is sent to the air storage tank, and then it is supplied by the air storage tank pipeline to various gas consumption sites. The air storage tank is in the air compression system. The main role is to ensure stable gas supply. Compressed air accumulates water in the air storage tank, adjusts pneumatic equipment to cause fluctuations in air pressure due to unbalanced gas consumption, increases the pressure stability of the gas equipment, or reserves a part of compressed air, which enables users to use it when the compressor fails. This part of compressed air is used for emergency treatment of pneumatic equipment or pneumatic control system. ^[1]

A gas storage tank is a device designed to store gas. Gas storage tanks are commonly used to store and transport gas. It can be divided into ultra high pressure gas storage tank, high pressure gas storage tank, low pressure gas storage tank, and medium pressure gas storage tank according to the pressure of the gas storage tank. According to the metal materials used in the gas storage tank, it can be divided into stainless steel gas storage tanks. , Carbon steel stainless steel gas tank, alloy material stainless steel gas tank.

Container structure for storing gas in urban gas supply projects. The role of the container is described in the gas storage tank. It is also used in the petroleum, chemical and metallurgical industries. According to different gas storage pressure, it is divided into two types: low pressure and high pressure. The former is divided into wet type and dry type according to the structure.

The composition of the gas storage tank

The air storage tank of an air compressor is composed of a head, a cylinder, and several nozzles attached to the air storage tank. The head and the cylinder are bent from a plate, including the cylinder. The tank is connected to the tank by a flange. The head and the lower head, the outer side of the upper oval head is provided with a pressure gauge interface, an air outlet, and a safety valve interface that communicate with the tank, the cylinder has an air storage cavity, and a drain valve is provided at the bottom of the lower head. A support is provided on the outer wall of the lower head; a dehydrator is provided in the air storage cavity. The dehydrator includes a cylindrical cylinder with a tapered bottom surface. A fixed bracket fixedly connected to the cylindrical cylinder is provided on the inner wall of the lower head. The body is provided with an air inlet pipe that extends into the air storage cavity and is connected to the cylindrical body along the tangential direction of the cylindrical body. The top surface of the cylindrical body is provided with an air guide pipe. The bottom of the conical bottom surface of the cylindrical body is connected to the water outlet pipe , The outlet pipe is connected to the drain valve. ^[1]

Gas storage tank inspection requirements

Generally used as a simple pressure vessel, air compressor gas storage tanks have always been considered a safer special equipment, but there are also certain risks. If there are problems in design, manufacturing quality, installation standards, operation, and management, Failure to meet the requirements will bury hidden dangers, and serious accidents may occur during use, resulting in personal injury and equipment damage.

The gas storage tank must be installed before installation. After installation, the pressure vessel use certificate and periodic inspection shall be performed in accordance with the requirements of special equipment, and the inspection report shall be obtained before it can be put into use. Regular inspection shall be carried out according to the pressure level and service life of the gas storage tank. Gas storage tanks that have not passed the regular inspection shall not be used. The volume and pressure of the air storage tank should meet the design standards and cannot be configured randomly. An air compressor is equipped with an air storage tank. The air storage tank of the ground air compressor station should avoid direct sunlight. The air storage tank must have inspection holes, and the oil scale in the tank must be removed regularly. ^[1]

Requirements for safety accessories and protection devices of gas storage tanks

1.Gas tank safety accessories

1) Safety valve

The main function of the safety valve of the gas storage tank is to force the discharge when the air compressor fails to automatically release pressure according to the set pressure, and the pressure reaches the relief pressure of the safety valve, so that the pressure of the gas storage tank does not rise too high. Therefore, the safety valve should be checked regularly, because the gas storage tank is a container used to store compressed air. When the pressure and temperature exceed the capacity of the container, it will explode. The safety valve must be pressure-controlled according to the working pressure. The safety valve is sensitive and reliable, and regularly checked. After the safety valve is inspected during operation, it must not be unsealed by itself. Manual and automatic start-up tests of the safety valve should be performed periodically to check the reliability of the safety valve. Common failures of the safety valve are that the opening pressure is reached but not opened, and the safety valve is automatically opened if it does not reach the opening pressure.

2) Gas tank pressure gauge

The main role of the gas tank pressure gauge is to indicate the pressure of the medium in the tank. The pressure gauge should be calibrated once a year with a certificate of inspection. If the pressure gauge is damaged during use, it should be replaced in time to ensure that the pressure gauge indicates accurately

2.Gas tank protection device

1) The gas storage tank must be equipped with an over-temperature protection device. The temperature in the gas storage tank during operation should be kept below 120 ° C. When the temperature is over-temperature, it can automatically cut off the power and alarm.

2) A pressure relief valve must be installed on the outlet pipe of the gas storage tank, and its diameter must not be less than the diameter of the air pipe, and the release pressure should be 1.25 to 1.4 times the maximum working pressure of the air compressor.

3) Due to the high temperature of the compressed air, it will gradually cool after passing through the air storage tank, and the moisture in the air will condense. Therefore, the drain valve at the bottom of the air storage tank should be opened regularly to discharge this part of water. Not only will it affect the quality of the compressed air, but it will also cause the gas storage tank to rust away, so it is necessary to install a drainage device for the gas storage tank.

The drainage device is equipped with manual switch and solenoid valve switch. Normally, there is no need for manual regular drainage; if the solenoid valve fails, the manual switch can also be manually opened for drainage, making the entire air compressor gas tank safe and efficient. High reliability and long service life. ^[1]

Requirements for safe operation of gas storage tanks

1) Establish and improve relevant rules and regulations, including operating regulations, maintenance systems, operation records, inspection records, and protection test records. The operating regulations should be strictly observed, so that the working pressure of the gas storage tank should not be higher than the specified pressure, and the inspection should be conducted on time and the operation records filled in time.

2) Before operation, check whether the appearance of the gas storage tank is damaged, whether the pipeline connection is closed, whether the pressure gauge is normal, whether the pressure gauge is within the normal pressure range, and the exhaust valve should be opened slowly. Pay attention to the water discharge in the tank. Open the intake valve again.

3) Check pipelines and tanks for leaks in a timely manner. If problems are found, they must be shut down to deal with them.

4) Daily inspections of equipment should be conducted in time to check the indicated value of the pressure gauge of the gas storage tank. If the working pressure is higher than the set pressure of the safety valve, the safety valve should be automatically opened; otherwise, the air intake should be stopped immediately and the operation should be stopped. Leakage should be repaired in time, pay attention to whether the safety valve and pressure gauge are normal.

5) When the air storage tank is in use, check whether the drain valve at the bottom of the air storage tank is installed with an automatic drain. If it is installed, pay attention to whether the automatic drain valve is draining normally, otherwise the moisture in the air will flow to the production line due to too much. Affects product quality; if not installed, manual valve opening and drainage are required at least once per shift.

6) The gas storage tank is a high-pressure container, and no flammable and explosive gas is allowed near it. Keep the tank clean, dry, and ventilated, and it is forbidden to pile up debris around it. 7) During operation, it is strictly forbidden to hit or knock the tank with metal objects. The gas storage tank is not severely corroded, the support is stable, there is no crack at the welding place, and there is no severe shaking during operation. ^[1]

Analysis and Maintenance of Gas Tank Explosion Causes

1. Causes of gas tank explosion

The gas pressure in the gas storage tank rises sharply. If the strength limit of the wall thickness of the tank is exceeded, the safety valve will fail and the gas storage tank will overpressure. Because of the carbon deposits in the gas storage tank, mechanical shocks caused by hard particles during movement, and sparks generated by electrostatic discharge, due to poor cooling, a large amount of oil and carbides have accumulated in the gas storage tank, and the carbon deposits in the tank were not cleaned in time. Combustion, prone to combustion and explosion of gas storage tanks.

2.Maintenance of gas storage tank

1) The maintenance of the gas storage tank is very important. It should be checked daily for looseness and failure of the pipe connection screws. The screws should be buttered to prevent inconvenience and disassembly of the screws. Damage to the tank. Keep the tank clean and rust-free. Anti-rust treatment. When inspecting and repairing, care should be taken to avoid wood chips, iron chips, wiping cloths, etc. from falling into the gas storage tank and conduit. If the gas storage tank is not used for a long time, the water in the tank should be drained and the tank should be kept dry.

2) The appearance of the gas storage tank should be bright in color, uniform in surface treatment, flat in welding seams, clear in lines, and must have a device nameplate. The device nameplate has the working pressure of the gas tank, the date of manufacture, the volume, the factory number, the weight, the volume, The medium, supervisory inspection unit, manufacturing unit, and nameplate of the gas storage tank must be marked with the product's steel stamp number. According to relevant national regulations, each gas storage tank must be equipped with a quality guarantee certificate before leaving the factory. Set up one machine and one file of gas storage tank equipment, including gas storage tank inspection report, use certificate, related technical information, rules and regulations, drawings and other contents. The operator must hold a certificate to take up the post, realize remote monitoring and unattended, and must be inspected regularly by a special person to deal with problems when found. ^[1]