Issue with nitrogen protection after equipment arrival

Generally, it is determined based on the customer’s requirements as to whether N2 filling is necessary. The purpose of filling with N2 is to prevent oxidation of the inner walls of the equipment; usually, a slight positive pressure of 0.02–0.05 bar is used. After the equipment arrives, the relevant operations should be carried out according to the customer’s own instructions.

1. Sealed containers generally require nitrogen purging for protection. 2. The benefits of nitrogen purging include preventing oxidation and moisture intrusion, as well as detecting leaks. 3. A normal reading for the pressure gauge in a nitrogen-purged system is between 0.02–0.05 MPa. 4. Nitrogen should be released from the system after the equipment is in place but before piping is connected. 5. If the blind flanges or manholes on the equipment need to be removed during installation, re-nitrogenation is usually not necessary after the equipment is in place, but sealing measures must still be taken. 6. If the blind flanges or manholes are removed and not reinstalled for a short period of time, re-nitrogenation is required

The main purpose is to prevent accelerated equipment corrosion and maintain equipment cleanliness, using nitrogen at a pressure of 0.1~0.5 MPa

In fact, those devices require nitrogen filling, depending on the specific requirements of the devices and the manufacturing process. Most equipment does not require nitrogen filling. However, there are also some devices that must be protected with nitrogen; otherwise, irreparable consequences will occur. To give a simple example, take a refrigeration unit (MRU) – if the refrigerant is already added to the device before it leaves the factory, then nitrogen is not necessary. If the MRU is made up of two parts that need to be assembled on-site, nitrogen must be used; otherwise, air will enter the refrigerant chamber. The moisture present in the air will condense into water when the freezer is in operation, which can block the pipes. Over time, this can lead to rusting, thereby making the moving parts less flexible. Therefore, devices such as MRUs must be protected with nitrogen during the period before testing, once they arrive at the site. I wonder what device the original poster is using? Specific equipment, specific analysis.

Under what circumstances does equipment require nitrogen protection? What are the benefits of nitrogen protection? What range of readings is considered normal for the nitrogen purge pressure gauge? When can the nitrogen be released? If the blind flanges or manholes on the equipment need to be removed during lifting and installation, is it necessary to refill nitrogen after the equipment is in place? Answer: The advantage of nitrogen flushing for protection is certainly that it helps prevent corrosion. The pressure used for this protection is slightly positive; generally, nitrogen flushing is employed for storage purposes, and the pressure can be released if the material is to be used. Spares for critical rotating equipment can be protected with nitrogen, but this comes at a cost of tens of thousands of dollars, as a special container needs to be built. As for nitrogen filling for pressure vessels as a protective measure, it’s simple – nitrogen can be directly used for this purpose