Operating specifications and usage rules for liquid oxygen storage tanks
< 1. Operating Standards for Liquid Oxygen Storage Tanks 1. The actual operating personnel of liquid oxygen storage tanks should understand the production process, machinery and equipment, and knowledge of ultra-low temperature liquids. They should regularly check the pressure gauge, liquid level transmitter, and various safety devices. Storage should not be carried out under unreliable preventive measures, especially to avoid the gate valve being frozen and stuck.
2、 The gas body of the inflatable seal should be dry N2 and cannot be terminated, so that its internal working pressure is maintained above 0.01 MPa.
3、 It is strictly prohibited to use liquid oxygen storage tanks with working pressures exceeding the set working pressure. The acetylene gas composition in liquid oxygen should be checked weekly, and liquid oxygen should be discharged if it exceeds 0.1ppmm.
4、 Liquid oxygen storage tanks are prohibited from being filled, and the vapor must be stored indoors. Therefore, it is required that liquid oxygen should not exceed the geometric capacity of the storage tank, and the liquid level gauge should not exceed 90%. 5. The pressure gauge, vacuum gauge, liquid level transmitter, alarm equipment and their valves should be calibrated on time, and they should be flexible, reliable and effective,.
6、 The water level of the vaporizer should not be less than the standard value, and the temperature is generally controlled around 60 ℃. The vaporizer should be equipped with an alarm for low outlet temperature and a liquid oxygen pump parking protector. The outlet CO2 temperature of the vaporizer should be above 0 ℃.
7、 When freezing and cleaning machinery, pipelines, and gate valves, use hot N2 or gas at 70-80 ℃ to lift the freeze. It is strictly prohibited to knock, burn, or use electric heaters.
8、 To avoid liquid oxygen leakage and freezing equipment, it is not necessary to let ultra-low temperature liquids come into contact with the skin, which can cause severe freezing.
9、 It is strictly prohibited to have high temperature or hot source close to the liquid oxygen storage tank and ultra-low temperature liquid pipeline, and flammable and explosive materials close to them. Fire or flames are not allowed within 30mm of the liquid oxygen storage tank, and equipment must be used.
< The key function of LO2 storage tank is to fill and store liquid oxygen liquid. The application regulations for low-temperature liquid storage tanks should take into account the hazardous characteristics of the vapor, the actual effectiveness of low-temperature maintenance, the surrounding environmental conditions, and the characteristics of high-pressure vessels, and adopt technical management measures for operation.
The operators of LO2 horizontal low-temperature storage tanks should have a detailed understanding of the structural characteristics of the machinery and equipment, as well as the pipe and valve system. They should also have a good grasp of the hazardous characteristics of low-temperature liquids, strictly control the surrounding environment, and carry out operations according to the LO2 tank operating procedures.
. The homework staff must undergo training and assessment by the municipal and quality supervision units, meet the standards, and possess a professional qualification certificate for actual operation of high-pressure vessels before they can start working. Before starting the homework, the homework staff should take appropriate protective measures for workers according to regulations. The application of LO2 storage tanks should strictly follow the rules and improve daily work. When storing low-temperature liquids, the filling rate should not exceed 0.95, and excessive filling is prohibited. Before the LO2 storage tank is delivered for use, the container should be sealed steadily, with various accessories (including gate valves, instrument panels, and safety devices), flexible and reliable, moderate pipeline materials, and dry and oil-free system software inside. During the normal operation of LO2 storage tanks, dedicated personnel are required to conduct inspections. The working pressure of the inspection container should not exceed the maximum pressure of the storage tank. If there is overpressure, pressure relief measures should be taken. Check the condition and leakage of each gate valve. If any leakage is found, immediate measures should be taken to correct the abnormality.
Regularly maintain the vacuum value inside the LO2 storage tank clamp. If the vacuum value deteriorates, measures should be taken to supplement the vacuum packaging (the vacuum packaging of the storage tank should be carried out by inviting technical enterprises or original manufacturing enterprises).
. LO2 storage tanks are classified as special equipment under mandatory supervision in China and are included in the third category of high-pressure vessels. They should undergo regular inspections in accordance with relevant laws, regulations, and technical standards. Storage tank accessories should also be inspected on time. Generally, pressure gauges, level transmitters, valves, etc. should be inspected or replaced once a year. If various common faults are found in the LO2 storage tank machinery and accessories, the cause should be investigated anytime and anywhere, appropriate and specific analysis should be made, and solutions should be adopted to ensure its continuous normal operation and application.
