manufactured gases containing more than 30% hydrogen (by volume)
unsymmetrical dimethyl hydrazine
(UDMH 1,1-dimethyl hydrazine)
acetuc acid (glacial)
1-butanol (butyl alcohol)
2-butanol (secondary butyl alcohol)
ethanol ( ethyl alcohol)
ethyl acrylate (inhibited)
ethylene diamine (anhydrius)
methane (natural gas)
methanol (methyl alcohol)
3-methyl-1-butanol (isoamyl alcohol)
methyl ethyl ketone
Methyl isobutyl katone
2-methyl-1-propanol (isobutyl alcohol)
2-methyl-2-propanol (tertianry butyl alcohol)
1-petanol (amyl alcohol)
1-propanol (propyl alcohol)
2-propanol (isopropyl alcohol)
Hazardous concentrations of flammable gases or vapors exist continuously, intermittently, or periodically: under normal operating conditions; because of repair or maintenance operations; due to breakdown of equipment which might release flammable gases or vapors.
1. Flammable liquids or gases are handled but are confined in closed containers and can escape only in case of accidental breakdown.
2. Concentrations of gases are normally prevented by positive mechanical ventilation but might become hazardous through failure of ventilation system.
3. Locations adjacent to Class I, Division 1 locations in which hazardous concentrations are prevented by positive-pressure ventilation from a source of clean air with safeguards provide against ventilation failure.