not sure if it is of any help, but supplementally to Dave's comments, the refining industry also suffers the risk of Pyrophoric Iron fires when opening carbon steel vessels that have been subject to oxidation, followed by an oxygen free atmosphere with H2S present generating Iron Sulphide. On platform shutdown when vessels are opened the Iron Sulphide then reacts with oxygen returning to Iron Oxide, Sulphur (and/or sulphur dioxide) and heat.....
They methods that are used to deal with this are related to the ensuring the vessels are cleaned prior to accessing, this is commonly a multistep process, for example ideally a distallation column would may go through the following clean up cycle before being opened to the atmosphere:
- Steaming to remove residual hydrocarbons
- Hot Water Washing (in conjunction with the steam), possibly detergents
- Blinding for isolation
- Chemical Washes for removal and neutralisation of FeS deposts, including using acids (with or without H2S suppressant), Chelating Solutions (can be expensive) or Oxidising Chemicals
Best practices for dealing with components that may be pentrated with FeS (such as Catalysts, or general scraps and debris) include ensuring they are kept wet and in the case of cataysts, less than 50degC and shipped in internal lined drums first filled with inert gas, with a peice of dry ice placed in the drum before sealing.