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In this paper, the influence of various side-groove root configurations on critical stress intensity factor for sulfide stress cracking (KISSC) and finite-element analysis (FEA) results were focused upon.
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A method of determining a required inspection interval for large storage tanks - with design modicfication, risk based inspection (RBI) and utilizing finite element analysis (FEA) - with particular attention for the weld between the bottom annular plates and shell wall.
Corrosion under insulation (CUI) is a widespread corrosion phenomenon in many industries since it was first described in 1965. CUI generally occurs when moisture is retained within thermal insulation and metal interface and when the protective coating breaks down. Improper installation and eventual damage to metal jacketing act as an entry point for water. The rate of CUI can be further accelerated depending on the amount of leached corrosive species and the operating parameters.
Aims to evaluate stress and strain around a pit and to determine the relationship between plastic zone size and pit geometry using the Finite Element Method (FEM). A database containing the relationship of pit parameters and plastic zone size can provide an understanding of the risk of through-wall failure in X65 steel.
The life of offshore jacket structures can be extended up to 30 years towards the end of their design life by retrofits. For larger structures, and in unusual cases, semi-remote ICCP anode sleds are a favorable option compared to sacrificial anode cathodic protection (SACP) due to the high current output from each individual installation, reducing the time to install substantially. Anode sled locations are determined based on site plans, experience, survey data, and equations evaluating “remoteness” or “voltage rise” criteria.
The Double Cantilever Beam test method in ANSI NACE TM0177 is increasingly applied as a QA test. In this analysis, influence of various side-groove root configurations (considered to change the stress concentration) on KISSC and Finite Element Analysis results were focused upon.
Carbon steels and low alloy steels have been used extensively in the oil and gas industry for many decades. The success of their applications in the energy sector is a balanced result of the materials affordability and operation needs in the fields. Producing H2S containing fluids remains a challenge for well integrity as no compromise is acceptable.