Can Pyrophoric Materials Form in Oil Tankers with Inert Gas Fire Protection Systems.
NAVAL RESEARCH LAB WASHINGTON D C
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A literature study and analysis was made concerning the potential hazard of pyrophoric ignition of flammable vapors in oil tankers with inert gas systems IGS. Only two pyrophor possibilities seem to be likely Formation of ferrous sulfide FeS andor ferrous oxide FeO. Both FeS and FeO may be formed in an oxygen limited atmosphere, such as would be the case with a flue gas IGS. Formation of FeS also requires an atmosphere containing hydrogen sulfide H2S, as would be the condition with sour crudes, so that the hazard of the formation of pyrophoric FeS must be considered for such crudes. Furthermore, if sea water is present in the oil tank, oils which do not contain H2S can become sour by the action of sulfate reducing bacteria on sulfates in the water. It is concluded that in the event of failure of an IGS system, the ullage space should not be exposed to air suddenly. Author
- Inorganic Chemistry
- Marine Engineering
- Combustion and Ignition