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CHAPTER 5 MICROBIAL INDUCED CORROSION (MIC) - Coggle Diagram
CHAPTER 5
MICROBIAL INDUCED CORROSION (MIC)
MICROBIAL CORROSION
CORROSION CAUSED OR PROMOTED BY MICROORGANISM
DIRECTLY OR INDIRECTLY RELATED TO THE ACTIVITY OF MICROORGANISMS
MAJOR CONCERNS
SLIME FORMATION
DEPOSIT FORMATION
TUBERCLE FORMATION
BIOCONCRETIONS
CONSEQUENCES
CORROSION
PREMATURE FAILURE
REDUCE HEAT TRANSFER
REDUCE PRODUCTION
CATASTROPHIC FAILURE
DESTRUCTION OF IRON PIPING
INDUSTRY AFFECTED
PETROCHEMICAL
SHIPS AND MARINE STRUCTURES
POWER GENERATING
AIRCRAFT FUEL SYSTEMS
WASTE WATER FACILITIES
PROCESS INDUSTRIES AND PAPER MILLS
WATER SUPPLY AND DISTRIBUTION
TYPES OF BACTERIA FOUND
SULFATE-REDUCING BACTERIA(SRB)
Bacteria that convert sulfate ion to sulfides.
This bacteria can grow in low oxygen environments.
Require sufficient organic nutrients
IRON-RELATED BACTERIA(IRB)
Bacteria that convert soluble iron ions to insoluble iron ions.
Ferric iron is deposited on piping or system surface, createdeposits that are host sites where bacteria can grow
ANAEROBIC BACTERIA
Bacteria that grow in absence of aundant free oxygen
LOW NUTRIENT BACTERIA(LNB)
Bacteria that grow in environment.
LNB gow will form slimes and deposits which creates host sites where other MIC bacteria can grow
AEROBIC BACTERIA
Bacteria that grow in presence of free oxygen
FACTORS PROMOTE MICROBIAL GROWTH
CARBON SOURCE
ELECTRON DONOR
ENERGY SOURCE
PROVIDE BY: chemical substane light
MODE: chemotropic, phototropic
SOURCE: hydrocarbon(bacteria,fungi) ,sun, artificial light(algae)
ELECTRON ACCEPTOR(TEA)
AQUEOUS ENVIRONMENT
PROVIDE BY: moisture/free water
MODE: fungi >0.6, bacteria >0.9
SOURCE: supply side and facilities
METHODS TO IDENTIFY MIC
BIOLOGICAL
METALLURGICAL
CHEMICAL