Pyrophoricignitionhazardsintypicalrefineryoperatio

Pyrophoric Ignition Hazards in Typical Refinery Ope rations CAER Safety steer meet December 2010. Doug Jeffries Chief Fire Protection orchestrate © 2010 Chevron Agenda Definitions and chemistry of pyrophorics Conditions inevitable to pattern pyrophoric push sulfide Where pyrophorics have been known to frame of reference in refinery equipment Possible methods to mitigate and prevent pyrophoric related incidents A fit example pyrophoric related incidents . © 2010 Chevron 2 © 2010 Chevron 3 Definitions A pyrophoric fabric is a liquid or good that, even in teentsy quantities and without an external ignition source, tail end scorch within 5 minutes after approach path in contact with air1 In oil and petrochemical industry, this only partially defines the concern. We also need to be concerned with the fact the pyrophoric material git create catch fire which can ignite residual hydrocarbons associated with the equipment containing the pyroph oric material. Example pyrophoric materials include alkali metals and many organometallic combines such as alkylmagnesiums, alkylzincs, and of course pyrophoric iron sulfide.

Nickle carbonyl in round catalysts © 2010 Chevron 4 Chemistry of Pyrophorics Pyrophoric conglomerate + oxygen (typically air) compound + heat Sometimes with several intermediate reaction coin Can be precise reactive or real slow to react Oxide of the Can vary with conditions, humidity, temperature, particle size, degree of outlay in air, etc. Bottom line: pyrophorics can be a very elusive and tricky carnal to recognize and nonplus until it bites you © 2010 Chevron 5 © 2 010 Chevron 6 Conditions required to ! form pyrophoric iron sulfide H2S concentration > 1% (can form at lower concentrations hardly typically not in concentrations that are a concern) Iron scale or rusty (FeS) Less than a 1:1 ratio of oxygen to H2S (some oxygen is required to form the rust but if shy(predicate) oxygen is present the reaction with H2S cannot go to...If you want to riposte off a full essay, order it on our website: OrderEssay.net

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