Safe for Workers
Safe for Workers :
Denotes a space that meets the following criteria: (1) The oxygen content of the atmosphere is at least 19.5 percent and below 22 percent by volume; (2) The concentration of flammable vapors is below 10 percent of the lower explosive limit (LEL); (3) Any toxic materials in the atmosphere associated with cargo, fuel, tank coatings, or inerting media are within permissible concentrations at the time of the inspection; and (4) Any residues or materials associated with the work authorized by the Marine Chemist, Certified Industrial Hygienist, or competent person will not produce uncontrolled release of toxic materials under existing atmospheric conditions while maintained as directed
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