22-06-12 Uw partner in Procestechniek Rijkers: Technology provider and System integrator
22-06-12 Uw partner in Procestechniek Primary activities/core business: Service provider
22-06-12 Uw partner in Procestechniek Dedicated solutions / concepts for typical applications
22-06-12 Uw partner in Procestechniek
22-06-12 Uw partner in Procestechniek Suspensions are usual non-Newtonian. Polymer suspensions decrease in viscosity curve rapidly, but until a continuous level. Downlimit limited by polymer chain length and ability of polymer chanins to lay up parallel. In milk of lime the viscosity is of the electrochemical type, and not limited on a lower limit because the faster the particles are moving, the lesser the interaction.
22-06-12 Uw partner in Procestechniek Crevice corrosion at tube end
22-06-12 Uw partner in Procestechniek The solution provider in mixing powders and liquids
Transcript of "Corrosion prevention"
AL-KHODARI INDUSTRIAL TRADING & SERVICESDealing with corrosion
Company headlines Know-how in processes and installations for powders and liquids, Consulting and implementing installations with optimal R.O.I., Reliable process solutions with minimal complexity, Innovative and active supporting in process issues.
Services Process engineering Engineering • Mechanical • Electrical Production Process control Mechanical installation Electrical installation Maintenance & service
Experience & know-how Milk of lime • Storage & dosing of (quick) lime • Mixing, storage & dosing of milk of lime Slurry handling • Coal, sand, sulfur, magnesium oxide, etc. Paint & compounding Storage, dosing and handling of hard-to-handle materials Glue preparation • Preparing, cooking & dosing of PVA or starch based glue Liquid handling • Dosing skids Storage & handling corrosive materials
References Akzo Nobel Akzo Salt Chemistry Carmeuse Chemetall Degussa Interbrew Nederland Koninklijke Marine – Royal Dutch Navy Nestlé Nederland PPG - SigmaKalon Coatings Rockwool Lapinus B.V. Sabic Melaf SHELL Ned. Chemie Smurfit Kappa Packaging Fokker Nederland – Parts for JSF and Apache 9 helicopter Waterschap Zuiveringschap Limburg – waste water treatment Waterschap Zuiveringschap Brabant – waste water treatment
Galvanic corrosion Contact of dissimilar metals in electrically conductive liquid Welds, containing ferrites and due to different structure Contact metal with corrosion products Contact corrosion Contact corrosion accelerates pitting & crevice corrosion
Microbiologically InfluencedCorrosion (MIC)Prevention / resistance: Maintaining cleanliness Monitoring quality of water Smooth surfaces Avoiding stagnant areas Stainless steels with molybdenum > 6% are virtually resistant to MIC
Sequence of corrosion Crevice corrosion at gaskets, crevice / galvanic corrosion at welds. Contact corrosion due to corrosion products. Algae settle on corrosion induced roughness Bacteria settling at algae/roughness Formation bio-films and degrading agents Acceleration of corrosion processes up to 1000 times of ‘normal’ process
Unusual and excessive degree ofcorrosion can occur unpredictably, due to specific local conditions
Pictures RO skid Pitting corrosion Facilitated by stagnant water
Pictures RO skid Contact corrosion Corrosion by polluted welding material
Pictures RO skid Contact corrosion by polluted welds
Pictures RO skid Contact corrosion Consequential MIT on rough surface Density MIT related to lines Corrosion processes related to stagnant water
ConclusionsBasic types corrosion: pitting & crevice corrosionPrimary corrosion propagated by contactcorrosion and Microbiological InfluencedCorrosionStagnant areas over a longer period of time arefacilitating & accelerating corrosion enormouslyStainless steel 316L in RO skid will corrodeWorst case circumstances were availableSerious risk is unpredictability of corrosionreaction velocity; several cases of suddenunusual degree of corrosion are known
AL-KHODARI INDUSTRIAL TRADING & SERVICESSpecialized in process installations for handling dry and liquid materials
Proposed actions Survey of similar installations at Aramco: • Compare differences in materials / set-up • Examine water compositions • Compare biological analyses • Evaluate state of corrosion to age Conclude either whether risk level incurred in common practice is acceptable or common practice is to be re-defined
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