A periodic pigging operation performed to clean off sediment and provide operators with detailed health information for a pipeline is mandatorily required. The research on pigging-induced issues the steel catenary riser (SCR), one of key parts in offshore hydrocarbon recovery pipelines between floating production system seabed, has been scarce until now. As result, there an urgent need theories...

This paper described the discovering process of some shortcomings of the conventional fluid catalytic cracking (FCC) process and the proposed two-stage riser (TSR) FCC process for decreasing dry gas and coke yields and increasing light oil yield, which has been successfully applied in 12 industrial units. Furthermore, the multifunctional two-stage riser (MFT) FCC process proposed on the basis o...

Optimum casting designs are unreliable without consideration of the statistical and physical uncertainties in the casting process. In the present research, casting simulation is integrated with a general purpose reliability-based design optimization (RBDO) software tool previously developed at the University of Iowa. The RBDO methodology considers uncertainties in both the input variables as we...

A combined BEM-FEM model has been developed to simulate the dynamic interaction between non-linear waves and an impermeable seawall with a submerged rubble toe over a sand seabed. A poro-elastic finite element model has been developed and used under the surface pressure computed by the BEM-FEM model. Modified Navier-Stokes equations are used to solve the flow inside the porous media and Biot's ...

To meet the requirements of riser safety monitoring in offshore oil fields, a new Fiber Bragg Grating (FBG)-based bundle-structure riser stress monitoring sensor has been developed. In cooperation with many departments, a 49-day marine test in water depths of 1365 m and 1252 m was completed on the "HYSY-981" ocean oil drilling platform. No welding and pasting were used when the sensor was insta...

Now a days, significant amount of aluminium alloy are being used to fabricate components such as engine blocks, cylinder heads, suspension control arms, wheels and pistons. In response to consumer demands for the increase in performance, the use of aluminium has grown dramatically in the recent years. So in order to produce a sound LM6 (Al-12%Si) Aluminium alloy casting, a new approach is made ...

This study presents an alternative methodological approach for thermal rating of power cables installed in vertical risers covered by unvented circular protective guards. An analogue thermal-electrical circuit is proposed for the thermal analysis of cables inside vertical risers. The proposed equivalent analogue model is verified by means of indoor experiments and finite-element simulations wit...

Testing various models and mechanisms of high frequency seabed scattering was one of primary goals of recent major experiments in sediment acoustics, SAX99 and SAX04, conducted near Ft. Walton Beach, Florida [1-4]. The models to test were based on various assumptions about dominance of certain scattering mechanisms and corresponding theories of scattering. Such models, confirmed by experiments,...