Ethylene oxide sphere tank vent volume
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This is my first time working on an ethylene oxide spherical tank, and I’m seeking advice from experts. How should the discharge capacity of the safety valve for such a tank be calculated? Additionally, regulations require that nitrogen be filled at the outlet of the safety valve – how should the amount of nitrogen be determined? Can the gas released from the safety valve valve be discharged directly into the atmosphere? Ethylene oxide has an explosion limit of 3%–100%; it is flammable, explosive, and highly toxic. Some sources suggest using water for dilution – should the amount of water used be based on the total volume of material stored in the tank? Are there any relevant regulations regarding this?
This post was last edited by richardpai on 2018-10-10 22:32. Let’s answer the question first. The specifications of the safety valve shall be determined based on the discharge volume and discharge area calculated in accordance with the relevant provisions of GB150. The gas discharged from the safety valve should be routed to the flare system. When it is indeed difficult to discharge gases into the flare system, except for toxic gases of grades I to III, other flammable gases can be directly released into the atmosphere. However, the exhaust outlet must be at least 3 meters above the roof platform of the storage tank, and within a height of 8 meters; alternatively, the gases discharged by the safety valves can be directed to a safe location for release. (Excerpted from the standard SH3007-2014 Code for Design of Tank Areas in Petrochemical Storage and Transportation Systems) Below is the process diagram of the ethylene oxide storage tank from the literature, for reference. Based on your description, your knowledge of storing ethylene oxide is still quite limited; it’s difficult to reach a level sufficient for direct engineering design using the information available on forums. It’s best to seek advice from experienced professionals within your organization.
Ethylene oxide is classified as toxicity level I; according to the aforementioned standards, it cannot be released into the atmosphere
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