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Markings for sour crude oil
  • Petroleum sour crude oil packagings and limited quantities must be marked a certain way.

A bulk packaging used to transport petroleum crude oil containing hydrogen sulfide (sour crude oil) in sufficient concentrations that the vapors may present an inhalation hazard must be marked with the Globally Harmonized System of Classification and Labeling of Chemicals (GHS) toxic pictogram or a warning statement such as “Danger: Possible Hydrogen Sulfide Inhalation Hazard.” The marking must be displayed at each location (manhole, loading head) where exposure to hydrogen sulfide vapors may occur.