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Optimized solutions for long service-life of concrete structures in aggressive environments. Collecting data on structures. Extracting and testing cores from selected elements. Data input to a mechanistic chloride transport model. Remediation scenarios modeled. The cost of each scenario can be compared. Case studies.
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Case study: Cracking occurred in a (UNS S32100) type austenitic stainless steel nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up. Normal preventive measures had been taken. The failed sample was removed for metallurgical analysis and determination of mechanism(s).
An operator in North America discovered an internal corrosion failure in a wet gas system directly below the point of injection of a water-soluble corrosion inhibitor (CI). Tests using low shear rotating cage autoclaves and a dual autoclave system were performed as a corrosion screening method.
Pipeline casings can be or are a problem. This paper will discuss the issues with casings, introduce one way of managing a casing program and offers some solutions to the casing management issue.
This product slowly dissolves for long term scale/corrosion protection. This paper describes the chemical management system that reviewed: statistical interpretation of the results, laboratory methodologies, software simulations to calculate (a) the amount of encapsulated materials (b) frequency of treatment, (c) the economic analysis.
For pipe installed through bore methods, visual inspections and electronic coating holiday detectors during installation becomes impractical. This paper/presentation will discuss the steps we took as a pipeline operator to find a practical approach to performing a coating quality test on bored pipe.
Laboratory performance evaluations and field data of the non-triazine based high temperature stable H2S scavenger will be discussed. The new H2S scavenger acts as a corrosion inhibitor and is thermally stable up to 200°C. It does not promote scale as observed during dynamic scale loop evaluations.
The phenomenon of a potential-dependent chloride threshold (PDT) along with the corrosion macrocell coupling between active and passive steel assembly components allows to combine a corrosion initiation-propagation model to forecast the durability of reinforced concrete structures in marine service.
Selected Fe- and Ni-based alloys and superalloys have been exposed in 99.995% supercritical carbon dioxide for 500 hours at 750°C and 200 bar. Post exposure examination provided information on corrosion rates, microstructural evolution and the carbon concentration in the exposed materials.
Coatings are supposed to be the first line of defense against corrosion, while cathodic protection is secondary. Is this really occurring? The findings of direct examination digs appear to show otherwise.
Modern structural biomedical implants utilize titanium alloys. A major mode of failure is aseptic loosening, by the release of particles from the implants, leading to excessive bone erosion. Boron is a promising alloying element that can reduce inflammation, alleviate arthritis, and help with bone growth. This study is to compare corrosion behavior of Ti64 with and without boron,
Nanoparticles are being considered in the development of durable coating systems due to their beneficial electrical and mechanical properties. The present study aims to investigate the corrosion performance of a nanoparticle enriched zinc rich primer (NPE-ZRP) for structural steel in aggressive marine exposure.