An analytical method for calculating and forecasting static hydrogen fatigue of pipe steels intended operation in corrosive-aggressive environments containing sulfide has been developed. Mathematical calculations correlate well with experimental results (deviations do not exceed 5-7%), which is allowed engineering predictive calculations. The rate crack growth 06G2BA was investigated experiment...

all the producing and assembling processes exert residual stress on the pieces that may lead to structural failure. therefore, calculating the residual stress in such structures has been common in recent years. in this article, distribution of temperature and residual stress resulting from arc welding in three-pass butt joint in p91 austenitic stainless steel pipes is calculated and estimated u...

Deepwater and ultra-deepwater oil gas exploitation might be challenge due to the fatigue damage at touchdown zone (TDZ). Therefore, development of risers with thicker pipe ends (upset end) is a solution diminish issues related through reducing average axial stress. In current study, manufacturing an upset end was carried out by friction welding in API X65 PLS2 steel outer diameter 220 mm. Consi...

Pipe leaks detection has a great economic, environmental and safety impact. Although several methods have been developed to solve the leak detection problem, some drawbacks such as continuous monitoring and robustness should be addressed yet. Thus, this paper presents the main results of using a leaks detection and classification methodology, which takes advantage of piezodiagnostics principle....

Great efforts have been recently made in the world of metallurgy in order to reduce raw material consumption and particularly energy consumption. Although most metallurgical products are produced by the proved procedures of plastic forming, some changes appear owing to the following requirements: – improvement of product quality, – reduction of production costs, – increase of productivity as we...