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�S 1'IIUI'1:1('I'lL:; EFFECT 'r)I•u: i� IlY VUL. IN ALK <br /> WI:II;II'fla) <br /> LOCATION: <br /> AVI•:I M.E. I.t►WI:R UPPER <br /> H IIRS. L1MtT LIMIT <br /> Hydrogen Sulfide H 2 S Rotten 1egg odor In ImpaI r:; seni:e of Coal gas, petroleum sev <br /> Specific Gravity small convent rat lons. !:mcll rapidly as cun- gas, sludge gas. Local <br /> or 0dor not evident at cent rat ion Increases. 10 ppm 4.3 46.0 near bottom, may be abi <br /> Vapor Density It IKh roncr.ntraIIcm:; Acute I1nlsoning bottom if air is heater <br /> (Alr-1) 1. 19 colorless, Ilammable. paralyzes respiratory and highly humid. <br /> cuntier. <br /> Methane CH Colorless -Simple asphyxiation Natural gas. sludge gay <br /> Specific Gravity Odorless Acts mechanically to swamps, marsh. At top <br /> or <br /> Tasteless deprice tissues of 02 -- 5.0 15.0 increasing to certain <br /> l•'lanunt�blc <br /> Vapor Density <br /> Air-1 0.55 <br /> Nitrogen N2 Colorless, tasteless, Sewer gas, sludge gas <br /> Specific Gravity non-flammable. Physiologically Near top, but may be <br /> or <br /> Principal constituent inert -- -- -- found near bottom.Vapor Density of air. <br /> Air-1' 0.97 <br /> Oxygen 02 Colorless, odorless, Below 19.5% is con- Oxygen depletion from i <br /> (in air) tasteless, supports Hidered immediately ventilation and sbsorp <br /> Specific Gravity combustion dangerous to life -- -- -- of chemical coneumptlo, <br /> or and health. oxygen. <br /> Vapor Density 1.11 <br /> Sludge Gas May be practically Digestion of sludge ne <br /> Specific Gravity odorless, colorless, Will not support life -- 5.3 19.3 top of structure. <br /> or flummable <br /> Vapor Density <br /> Variable <br /> Sulfur Dioxide SO2 Non-flammable dues Industrial process uai, <br /> Specific Gravity not support combustiom Irritates resp.l.ratory sulfur compounds. pape <br /> or Colorless, strong tract meunbranes. 2 ppm -- -- products. Located at <br /> Vapor Density penetrating odor. bottom of structures. <br /> (Air-1) 2.26 <br />