Discharge volume under fire conditions of the breather valve of a methanol storage tank (atmospheric pressure tank)
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For methanol storage tanks (atmospheric pressure tanks) that are equipped with both emergency relief valves and vent valves, how should the discharge volume under fire conditions of the vent valve be considered? Should it be considered as 50% of the total discharge volume?
The breather valve takes into account only venting caused by temperature changes. The fire condition is relieved through the emergency relief valve.