Is it necessary to install a nitrogen blanket in the pressure tanks for liquefied hydrocarbons?
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Regarding the requirements for the **list of chemicals subject to initial regulation**, for vinyl chloride it is specified that care should be taken to ensure the containers are sealed and nitrogen-purged during storage, and that a small amount of polymerization inhibitor should be added. The saturated vapor pressure of vinyl chloride at 0 degrees is 0.1742 MPa. It should be used as a pressure storage tank. Is it necessary to install a nitrogen purge system for such a tank?
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I’ve never worked on vinyl chloride tanks, but looking at the numbers from above, I think a nitrogen blanket should be added.
This matter needs to be handled based on specific scoring criteria. In oil refining, many pressure vessels are equipped with a staged control system that includes nitrogen sealing, as the gases produced during refining are quite complex and contain gases such as hydrogen and methane, which are non-condensable gases. Their accumulation over time poses safety risks, so it is necessary to remove these gases, which is why a staged control system is designed. However, for pure C4, it will vaporize on its own when discharged, thereby filling the space created by the reduction in the liquid phase; therefore, liquefied hydrocarbon tanks generally only require a safety valve
Flammable liquids need to be protected by a nitrogen blanket; these liquids are used in liquid form, and nitrogen does not act as an impurity. Liquefied gas containing nitrogen as an impurity shouldn’t be sealed with nitrogen, right?
There’s absolutely no need for it; experts mislead people!
I have a question: can air get into pressure vessels?