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By: Eng. Jesus Eduardo Contreras What is Corrosion under insulation (CUI)? Corrosion Under Insulation (known by its acronym in English, CUI) is a phenomenon that normally affects pipes and pressure equipment made of carbon steel, as a result of the entry or condensation of water under the thermal insulation. Within this category …

By: Eng. Jesus Eduardo Contreras The inspection of storage tanks in accordance with the American API standards are vital to avoid not only catastrophic failures but also problems related to their mechanical integrity affected mainly by corrosion on floors, walls, and ceilings. In this article we want to show very quickly and …

By: Eng. Jesus Eduardo Contreras The inspection of storage tanks in accordance with the American API standards are vital to avoid not only catastrophic failures but also problems related to their mechanical integrity affected mainly by corrosion on floors, walls, and ceilings. In this article we want to show very quickly and …

By: Eng. Jesus Eduardo Contreras The probability of failure in a storage tank can be low but the consequences can be catastrophic. A leaking storage tank can not only cause serious environmental problems, affect human and animal life around it, but can also have a major impact on the profitability of the …

By: Eng. Jesus Eduardo Contreras In the past article we talked about the techniques to inspect volumetrics defect, now… Let us start with traditional methods and the most recent techniques to detect surface and sub-surface discontinuities: Technique Description Advantages Limitations Liquid Penetrant (LT) Liquid penetrant testing can be defined as a physical …

By: Eng. Jesus Eduardo Contreras When talking about this topic, we must consider at least 3 important aspects: i) Welding, which is already an extensive topic, but here we can define very briefly that it is a process that leads to the union of two or more materials together, in such a …

SAW procecss on horizontal joint

By: Dr. Eng. Pablo Ozaeta L. The 9%Ni steels could be welded using filler metals with similar chemical composition if the appropriate heat-treatment is applied to match the mechanical properties of the base metal. Filler metals having 12% nickel have also been developed, showing good toughness but low ductility. Welds made with …

Effect of alloy elements

By: Dr. Eng. Pablo Ozaeta L. 1.    Nickel Alloys System Nickel belongs to group VIII of the Transition elements together with Iron and Cobalt. It has the atomic number 28 and an atomic mass of 58,6934, representing a composite of 5 stable isotopes. In solid state, it has FCC crystallographic structure with …

LNG tank

Steels Used for LNG Tanks

By: Dr. Eng. Pablo Ozaeta L. 1.  LNG tank. Natural gas is transported by pipelines at high pressure, LPG, where the maximum rentable length are around dozens of thousands of kilometers or at low temperature and ambient pressure by LNG sea carriers, where natural gas could be transported for longer distances than LPG …