Common nitrogen filling for tanks
Thread Content
In the common tank containers that hold flammable, explosive, or volatile liquids, nitrogen is added to the top of the tank. What is the purpose of adding nitrogen? Is it to prevent air from entering and forming an explosive mixture?
1. Pressure retention: The storage tank needs to maintain a certain level of pressure, achieved through nitrogen pressure retention. 2. Isolation from air
1. Isolate from air. 2. Apply a slight positive pressure to the pressure vessel to prevent negative pressure
What is the purpose of separating it from air?
It’s about reducing the oxygen content in the gas phase or bringing it to 0. The concept of separation isn’t easy to understand. In this way, isn’t the risk of fire or explosion caused by the mixture avoided?
There are mainly a few methods: 1. Isolate air to prevent the formation of explosive mixtures; 2. Apply pressure to prevent vaporization; 3. Use it for powered transportation
Isolating air means cutting off one of the elements required for ignition and explosion: an oxidizing agent. Pressure retention involves preventing organic solvents from evaporating into the gas phase and accumulating at the top of the tank, thereby eliminating another element necessary for ignition and explosion: combustible materials.
Separated from air； Apply a slight positive pressure to the pressure vessel to prevent negative pressure.
Ensure positive pressure in the system to prevent air from entering； Prevent the formation of explosive gas mixtures.
Due to the ambient temperature and the loading and unloading of substances into the tank, its pressure changes continuously. To prevent the pressure from dropping to a negative level, it is necessary to introduce gas when the pressure falls. Since the gas inside the tank is flammable and explosive, it is impossible to use air for this purpose; therefore, nitrogen must be used instead. PS: Basically, a pressure PIC control system is installed at the top of each tank.