May I ask, is it necessary to have a vent on the top of a pressure vessel at normal pressure?
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May I ask, is it necessary to have a vent on the top of a pressure vessel at normal pressure? (Otherwise, it can’t be guaranteed to be at atmospheric pressure, right?)
Yes, otherwise how can gas-phase equilibrium be ensured, as well as the breathing during feeding and discharging?
Add an inverted U-shaped air duct at the top; if the flow rate is high, the pipeline should be thicker.
I don’t think it’s necessary. According to clause 1.2 of NB/T47003.1 \"Steel Welded Atmospheric Pressure Vessels\", only requirements are specified regarding the pressure of the vessel; there is no requirement that it must be connected to the atmosphere.
It should be necessary, especially for large atmospheric pressure tanks that lack breather valves. Or if it’s not big enough, it’s prone to deflating
A breathing valve is normal – otherwise it wouldn’t be possible to seal the container. In a container at atmospheric pressure, how can materials be added or removed if it’s not sealed?
A vent valve should be installed at the top of a pressure vessel at atmospheric pressure. Depending on the substances stored in the tank, if they are flammable or explosive, a flame arrester + vent valve must also be installed.
Connection to the atmosphere must be considered; for storage media that are volatile, toxic, or explosive, a vent valve (+ flame arrester) should be used, while for non-toxic media, a bend connecting to the atmosphere should be employed.
It needs to be installed, and the size of the ventilation opening must be determined based on the volume of the material in the container!