According to petrochemical regulations, is it required to install a safety valve in every combustible liquid storage tank?
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According to petrochemical regulations, safety valves must be installed when combustible liquids expand due to heat and the resulting pressure exceeds the design limit. Does this mean that every combustible liquid storage tank needs to take into account expansion due to heat in case of a fire, that is, every such tank should be equipped with a safety valve? ?
Only pressure vessels require it; atmospheric pressure vessels do not. Neither fixed roof nor internal floating roof
So, should we take fire scenarios into consideration? Normal ones are not considered pressure vessels; it’s hard to say what happens in case of a fire
High and low pressure safety valves, atmospheric pressure vent valves
Sir, can a breathing valve be used for pressure relief in case of a fire? What is the fundamental difference from a safety valve releasing pressure? ? Thank you!
A breathing valve can: vent directly to the atmosphere, use a flame arrester, or employ other sealing systems. I need to look up some information to find out the specifics.
It’s better for you to look up the standards on your own to gain more knowledge. :lol
The maximum operating pressure of the storage tank is greater than 0.1 MPa
Mainly, it concerns liquids whose volume increases sharply when heated; generally, safety valves are not required for liquid storage tanks
But what about the gas phase space at the top of the liquid?
Under normal conditions, the pressure in an atmospheric-pressure storage tank is regulated by a nitrogen seal and a vent valve, so there is no need to install a safety valve. In the event of a fire, petrochemical regulations require that adjacent tanks within a range of 1.5D of the diameter of the tank on fire be cooled (this cooling is primarily intended to prevent excessive temperatures from affecting the strength of the tank walls). The presence of vent valves prevents overpressure in the storage tanks, so there is no need to install safety valves.