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5705.3.1 Closure of Mixing or Blending Vessels
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Vessels used for mixing or blending of Class I liquids and Class II or III liquids heated up to or above their flash points shall be provided with self-closing, tight-fitting, noncombustible lids that will control a fire within such vessel.
Exception: Where such devices are impractical, approved automatic or manually controlled fire-extinguishing devices shall be provided.
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