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Caustic corrosion is sometimes referred to as “caustic attack or “caustic gouging.” Corrosion of this type may result from internally fouled heat transfer surfaces and the presence of sodium hydroxide in the boiler water; and concentrated solutions of alkali where the normal washing of the tube metal ID is restricted after Departure from Nucleate Boiling (DNB), i.e., when the steam bubble release exceeds the rinsing rate.
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Materials properties that are used in specific oil and gas environments are de-rated due to the risks associated with hydrogen embrittlement cracking. In oil production environments the concern is for the onset of stress corrosion cracking (SCC), while in seawater environments the concern is for Hydrogen Induced Stress Cracking (HISC). Both are hydrogen embrittlement phenomena with the distinction being the source of hydrogen for each. In SSC the source of hydrogen is from the presence of H2S in the oil production fluids, and in HISC the source of hydrogen is from the dissociation of water from the cathodic protection system. This paper is focused on the latter phenomena and aims to characterize the susceptibility of carbon alloy steels as applied in fastener applications, in a seawater environment under cathodic protection.
Scale and corrosion inhibitors are commonly used in many oil and gas production systems to prevent inorganic deposition and to protect asset integrity. Scale inhibitor products are based on organic compounds with phosphate or carboxylic functional groups such as amino phosphonates, phosphate esters, phosphino polymers, polycarboxylate and polysulfonates,1 as shown in Figure 1. These anionic groups have strong affinity to alkaline earth cations and can adsorb on the active growth sites of scale crystal (Figure 2), resulting in stopping or delaying the scale formation process.
Commercial & Residential Coatings Inspection is emerging as a new market that will provide tactical and ground floor opportunities to those involved while bringing additional value to the architectural coatings industry as a whole. This presentation will provide insight to the participants on the recommended experience, skill set, and education required to set up a successful Commercial Coating inspection service or agency.
While sprayable bedliners have been available for numerous years in the aftermarket, it has only been with the introduction of two component polyurea bedliner coating at Nissan-Canton, that a bedliner could be applied successfully in a high-volume production atmosphere
Qualified U.S. Navy nonskid coatings are two-component (2K) epoxy-based systems that contain various sizes of aggregate. Once mixed, these highly viscous coatings are applied using a napless roller to generate a “peak and valley” profile that provides skid/slip-resistance when cured. The roll-application process is slow and inconsistent, and appearance is often determined by experience of the applicator.
In this study a coupled multielectrode array sensor (CMAS) is used for coating and pretreatment evaluation on carbon steels. The preliminary testing results are summarized and discussed for further application.
This paper details a novel surface preparation process that is suitable for Duplex coating of galvanized steel intended for a variety of atmospheric and embedded service applications. It provides all the properties necessary for excellent coating performance and longevity, including high adhesion, excellent resistance to cathodic disbondment, and resistance to ingress of water, without the drawbacks associated with abrasive blasting, the traditional surface preparation method.
The purpose of this paper is to emphasize the current advancements of monitoring the integrity level of the processing facilities using means of Integrity Operating Window (IOW) program. In our company, integrity and material & corrosion departments across the upstream and downstream businesses successfully implemented a well oriented and constructive IOW programs to manage the corrosion risks and monitor the integrity level of the capital assets and proactively assess the situation to prevent loss of primary containment. The technology that sets behind this success is the digitalized approach that gathers information from process, operations, lab services and inspection programs and converts them all into a high-level real-time tracking system that asses the current status of corrosion threats and integrity level.
In this study a simple method has been applied to fabricate graphene nanocomposite with the inclusion of cerium oxide nanoparticles which can be effectively implemented as a reinforcement material in polyurethane coatings for corrosion protection.
Production of oil and gas is well known to cause potential corrosion issues due to the CO2 content in the well stream. Carbon steel is widely used for production facilities as e.g. flowlines and manifolds, however, aging of the reservoir increases the number of corrosive agents, such as e.g. CO2, which are known to cause high corrosion rates in carbon steel. Therefore, carbon steel piping is often being replaced with super duplex stainless steel due to its high strength, excellent toughness and good corrosion resistance. Replacing carbon steel with super duplex has been conducted on several mature offshore oilfields in the European North Sea region.
This paper will identify and document how these different factors affect the susceptibility of austenitic stainless steel to Chloride-Stress Corrosion cracking based on a review of currently available literature. A review of current industry best practices and a review of how the Oxygen content, the pH and application of stress relief affects Chloride-Stress Corrosion Cracking will be documented and presented.