![]() ![]() You must calculate the wetted area of the tank on the basis of 55% of the total exposed area of a sphere or spheroid, 75% of the total exposed area of a horizontal tank and the first thirty feet above grade of the exposed shell area of a vertical tank. Such device may be a self-closing manhole cover, or one using long bolts that permit the cover to lift under internal pressure, or an additional or larger relief valve or valves. The total capacity of both normal and emergency venting devices must be not less than that derived from Table H-10 except as provided in (e)(v) and (vi) of this subsection. If unstable liquids are stored, you must take into account the effects of heat or gas resulting from polymerization, decomposition, condensation, or self-reactivity. (iii) Where entire dependence for emergency relief is placed upon pressure relieving devices, the total venting capacity of both normal and emergency vents must be enough to prevent rupture of the shell or bottom of the tank if vertical, or of the shell or heads if horizontal. ![]()
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