Nitrogen protection for stainless steel pressure vessels
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Why are stainless steel pressure vessels sometimes filled with nitrogen for protection after manufacturing but before transportation?
First, to prevent deformation during transportation; second, during sea shipping, to stop moisture and humidity from entering the equipment and causing corrosion
It’s also designed so that after installation, the product gas can be used directly for replacement, without the need for additional purging
The first point in answer 2# is not very useful in practice, as the pressure for nitrogen flushing protection is very low.
It is mainly to ensure the dew point and cleanliness inside the container.
The main principle of nitrogen flushing is to replace the oxygen in the air with an inert gas. This prevents oxygen deficiency inside the equipment, thereby reducing the likelihood of oxidative corrosion and rusting. The nitrogen sealing pressure is generally around 0.5 bar. It is mainly used in areas with high humidity. Another function of nitrogen flushing is to protect the stainless steel lining from corrosion by chloride ions in the air.