What protective measures are required for air separation units when they are shut down for extended periods?
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What protective measures are required for air separation units when they are shut down for extended periods?
1. Perform proper reheating after parking. 2. Close all the inlet and outlet valves of the tower. 3. The tower is filled with nitrogen and sealed to maintain positive pressure.
As a supplementary note, drain the pipes containing excess water and liquid
Additionally, a sealed gas is maintained inside the cold box to prevent moist air from entering. Additionally, operating equipment should be rotated periodically (be mindful of the shaft seal gas and the start-up oil pump during rotation), and longer rotors should be marked for rotation in order to change their position when at rest.
When multiple units are in operation, be careful to prevent cross-contamination of materials; regularly monitor changes in temperature and pressure, and take measures to prevent freezing in winter.
For long-term storage, it is necessary to drain any residual liquid from inside, fill the container with nitrogen to maintain pressure, and close the inlet and outlet valves. The purging gas outside the refrigerator must also continue to be used for purging; it is important to regularly check the trend of pressure drop as well as the condition of the rotors in the moving equipment!
Precautions for long-term shutdown of air separation units: 1. Drain the liquid from the tower； 2 Full reheating ； 3 The valve on the device is closed ； 4. Fill the tower with nitrogen or dry air to maintain pressure; be careful not to cause overpressure in the tower ； 5. The compressor unit should start the oil pump regularly, maintain an appropriate oil temperature, supply sufficient sealing gas, and perform regular shaft rotation checks ； 6 Regularly clean the various pumps associated with the disk device to prevent rust on the pump shafts ；