Tanks shall be covered with a minimum of 2 feet of earth, or shall be covered with not less than 1 foot of earth, on top of which shall be placed a slab of reinforced concrete not less than 4 inches thick. The tank shall be placed in the hole with care since dropping or rolling the tank into the hole can break a weld, puncture or damage the tank, or scrape off the protective coating of coated tanks. Underground tanks shall be set on firm foundations and surrounded with at least 6 inches of noncorrosive, inert materials such as clean sand, earth, or gravel well tamped in place. The wetted area of the tank shall be calculated on the basis of 55 percent of the total exposed area of a sphere or spheroid, 75 percent of the total exposed area of a horizontal tank and the first 30 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 shall be not less than that derived from Table H-10 except as provided in subdivision ( e) or ( f) of this subdivision. If unstable liquids are stored, the effects of heat or gas resulting from polymerization, decomposition, condensation, or self-reactivity shall be taken into account. ( c ) Where entire dependence for emergency relief is placed upon pressure relieving devices, the total venting capacity of both normal and emergency vents shall be enough to prevent rupture of the shell or bottom of the tank if vertical, or of the shell or heads if horizontal.
Air compressor intakes or inlets to ventilating or air-conditioning equipment Open flames and other sources of ignitionġ1. Slow burning solids such as heavy timber or coalġ0. Fast burning solids such as ordinary lumber, excelsior or paperĩ. Flammable gas storage, either high pressure or low pressure.Ĩ. Flammable liquids below ground - in excess of 1,000 gallons.Ħ. Flammable liquids below ground - 0 to 1,000 gallonsĥ. Heavy timber, noncombustible or ordinary construction 1Ĥ. General requirements for dipping and coating operations.Īdditional requirements for dipping and coating operations that use flammable liquids or liquids with flashpoints greater than 199.4 ☏ (93 ☌).Īdditional requirements for special dipping and coating operations. Hazardous waste operations and emergency response.ĭipping and coating operations: Coverage and definitions. Process safety management of highly hazardous chemicals.
Storage and handling of anhydrous ammonia. Storage and handling of liquefied petroleum gases. Spray finishing using flammable and combustible materials.
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