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2405.9 Hardening and Tempering Tanks
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Tanks shall be located as far as practical from furnaces and shall not be located on or near combustible floors.
Tanks shall be equipped with a high-temperature limit switch arranged to sound an alarm when the temperature of the quenching medium reaches 50°F (10°C) below the flash point.
Hardening and tempering tanks greater than 500 gallons (1893 L) in capacity or 25 square feet (2.3 m2) in liquid surface area shall be protected by an approved automatic fire-extinguishing system complying with Chapter 9.
Air under pressure shall not be used to fill or agitate oil in tanks.
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Fire Code 2018 of Colorado > 24 Flammable Finishes > 2405 Dipping Operations > 2405.9 Hardening and Tempering Tanks > 2405.9.4 Fire Protection