Is a breathing valve required for a 100 cubic meter benzene storage tank?
Thread Content
I noticed that large benzene storage tanks are equipped with vent valves, while smaller benzene storage tanks do not have such valves; instead, an exhaust pipe leads to an exhaust gas cooler cooled by chilled water, followed by a flame arrester before the gases are released. As for 100 m3 benzene storage tanks that fall neither in the large nor the small category, I would like to know whether vent valves are necessary for these tanks, or whether the approach used for smaller tanks would be sufficient. Please advise me on what is the appropriate solution. Thank you!
Tank design generally uses 100 m3 as a dividing line; benzene is a toxic and volatile substance, so it should be designed as a large-scale tank. At the same time, when selecting a vent valve, the volatilization rate per unit area must be taken into account; flame arrestors should be installed, as well as flare systems or high-point vents.
:The melting point of phenol is 40.6 degrees. Under normal conditions, phenol storage tanks are equipped with heating systems; phenol is volatile in its liquid state, and it will crystallize when it comes into contact with materials at temperatures below its melting point. If a vent valve is installed, the first vent valve must be heated. Phenol vapor can contaminate the atmosphere, so our company uses a liquid seal tank filled with paraffin oil, with nitrogen used to fill the space at the top of the tank. During normal feeding, gas is released into the atmosphere through the liquid seal tank, while during extraction, nitrogen is used to replenish the air at the top of the tank. It’s important to note that both the nitrogen check valve and the pipelines connected to the liquid seal tank need to be heated as well!
Apply internal floating discs in accordance with relevant specifications to address the volatilization issue.