Propylene oxide storage tank design
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Question: For the design of a propylene oxide storage tank with water cooling to maintain a temperature of 20 degrees, should the tank be equipped with a vent valve and nitrogen purge system, or a safety valve?
What we do is design breathing valves + nitrogen seals.
-Respirator valve pressure of 150/350 mmH2O; it is advisable to add a control valve circuit for adjustment as well as an emergency discharge circuit
The breathing valve is set to 0.5~1.0 kPa (G) based on empirical values.
It is appropriate to set both, especially for non-EPC...
Have you worked on low-pressure propylene oxide spheres before?
The breathing valve is a flame-retardant single-breath valve with a pressure of +180 mmH2O or 1.8 KPa; it is equipped with a nitrogen seal and operates under automatic control.
Safety valves and pressure interlocks are required; the set pressure should be less than 0.1 MPa, with flame retardants added
1.20 degrees is a bit high; there is a high level of PO in the exhaust gases, which is wasteful. Unless spherical tanks are used, in that case nitrogen sealing plus exhaust ventilation is sufficient； 2. If spherical tanks are not considered and floating roof tanks are used, it is recommended to design a nitrogen seal + exhaust system + breather valve + pressure relief manhole.