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Nowadays, oil and gas fields containing a high concentration of CO2 and H2S at high temperatures are being operated in many areas. Here, internal corrosion control under these conditions has become one of the significant challenges in oil and gas production wells and a major cause of severe corrosion–related material failure in the industry.
Internal corrosion of the pipelines turns out to be a critical threat to the initial stage of production.
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The failure assessment of the collapse of the Quebec Bridge in 1907 conducted by the Royal Commission is discussed in the following paper. The Quebec Bridge is a 987.5 m long; 29 m wide; and 104 m high riveted steel truss structure which collapsed not once but twice during construction. The reason for the bridge failure was attributed to member behavior and stability proved by experimental work conducted following the collapse by Royal Commission. The bridge was finally completed in 1917 and has been in operation since then. The lessons learned from the bridge collapse were pivotal in the advancement of engineering design, fabrication and formation of the two organizations, namely - the American Association of State Highway and Transportation Officials (AASHTO) in 1914 and American Institute of Steel Construction (AISC) in 1921. The author highlights the importance of validating the design criteria and specifications by material and load testing, conducting peer reviews, design control, and paying attention to details. The lessons learned reinforce the need to establish and monitor shop fabrication practices, inspection procedures and gates (witness, hold and review points) to safely complete the execution of any civil engineering project, be it onshore or offshore construction.
Metallic coatings are frequently used on carbon steel and other metallic and non-metallic substrates for corrosion control, decorative or aesthetic purposes. The coating metal commonly used includes Zn, Al, Cu, Ni, Cr, Ag, Au, etc., singly or sometime in combination. When one of these metal coatings is applied on a metallic substrate, it is very important to consider the relative positions of the coating material and the substrate in the galvanic or EMF series.
Aluminum-based, iron-based and nickel-based alloys of known microstructures were exposed to cavitation erosion conditions using a vibratory cavitation testing apparatus in seawater as a testing medium. The cavitation tests were made at a frequency of 20 KHz as per ASTM-G30-90 and at a temperature of 25oC. Cavitation made the surface of these alloys very rough, exhibiting large cavity pits in the middle region of the attacked area as revealed by the scanning electron microscope (SEM). The cavitation damage initiated at interfaces of high energy such as grain boundaries, twins, Stacking faults and second phase particles. Hydrodynamic, electrochemical and metallurgical factors played a major role in loss of metals for these alloys as a result of the cavitation action.
The United Nations Sustainable Development Goals (SDGs) were developed in 2015 as a blueprint to achieve a better and more sustainable future for all. They address the global challenges we face, including those related to poverty, inequality, climate, environmental degradation, prosperity, and peace and justice. The seventeen SDGs interconnect and a number of the goals are affected by corrosion processes and material choices. This paper aims to address these particular goals by providing examples of how the wise application of material sustainability, material stewardship and corrosion management principles can help improve progress towards meeting the goals. Furthermore, this paper is intended to underline the positive financial benefits to industry and governments when corrosion management practices are properly applied.
The Use of sacrificial anode cathodic protection has successfully prevented the corrosion of both new and old corroding prestressed non-cylinder concrete pipelines. Field results from 5 new and 3 old lines, which have been cathodically protected for up to 18 years, are reported. In all cases the required potential difference criteria. have been achieved with current densities in the range 0.2 to 1.8 mA per square metre of steel surface area.
Alloy 600 and SS 316L are common materials used for structural components of pressurized water reactors (PWRs). However, as PWRs age, incidents of general corrosion and stress corrosion cracking (SCC) are more likely to be found in the structural components. One of the major material degradation problems is primary water stress corrosion cracking (PWSCC).
In the Oil and Gas plant industry, coating plays an important role in increasing added value for the purpose of providing product functionality and protecting products as the final stage of all work.In particular, heavy-duty coating refers to a coating system that can withstand severe corrosive environments such as sea, underwater, and coastal industrial areas, and has a durability of at least 20 years for structures that are difficult to repair environmentally and economically.
Cast Iron with its ancient history, traced back to 6th century BCE1, has been used for centuries to anything from manhole covers & fire hydrants to bridges. However, the development of Spheroidal Graphite Cast Iron (SGCI) or Nodular Cast Iron, in the 1940’s, with resulting improvement in mechanical properties such as ductility and fracture toughness, paved the way for further growth in industrial usage of cast iron.2 The material has been adopted by several industries such as automotive-, nuclear-, and wind turbine industry. During the last decade, SCGI has gained increased attention as construction material for subsea equipment in offshore oil & gas production, mainly competing with welded and bolted steel assemblies.