Do all decommissioned devices need to be protected with nitrogen?
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Do all decommissioned devices need to be protected with nitrogen? Are there any other methods to prevent corrosion?
Generally speaking, it is best not to remove the medium from ordinary equipment after it is shut down; this makes it easier to restart operations and also saves on nitrogen protection； If the processing is complete, it is necessary to take measures to prevent corrosion inside the equipment and to provide inert protection; nitrogen is the most cost-effective method for this purpose. If the facility does not have a nitrogen supply, bottled nitrogen can be purchased
When we inject gas at the bottom of the tower, we will contact an external manufacturer to have an inert liquid sprayed in; once vaporized, this liquid will adhere to the surface of the tower. It’s not known what exactly that substance is
I can find out what it is exactly.
Positive pressure protection is also required even when there is no material return, to prevent negative pressure air from entering. It also depends on the type of device; many devices require heat to maintain positive pressure, so in fact there is no cheaper way than using nitrogen protection. I believe that refining equipment that has not been used for a long time must have its materials removed, as this is safer. The equipment for light gas components is protected with nitrogen, while the equipment for heavy components can be protected by filling it with diesel.
Does filling it with diesel require the entire tank to be filled? If not, there’s still a lot of space that won’t be protected, right?
Towers and vessels do not require a liquid level; the low-point heat exchangers can generally be filled to capacity, and maintaining a slight positive pressure in the system is sufficient.
This is what is known as wet protection, but it’s not necessary to fill it completely; as long as a liquid seal is maintained, the remaining space can be kept under a slight positive pressure using nitrogen to create an inert environment.