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1910.262(ll) Open Tanks and Vats for Mixing and Storage of Hot or Corrosive Liquids—Shutoff Valves
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Boiling tanks, caustic tanks, and hot liquid containers, so located that the operator cannot see the contents from the floor or working area, shall have emergency shutoff valves controlled from a point not subject to danger of splash. Valves shall conform to the ASME Pressure Vessel Code, section VIII, Unfired Pressure Vessels, 1968.