... Abstract Depending on the cycle time, design, fabrication, and operations, coke drum repairs could be required in as little as five years of operation. In the last fifteen years, use of Structural Weld Overlay (SWOL) as a repair strategy to extend the remaining life of coke drums has increased...

... Abstract Replacement of coke drums is a major project that requires a significant investment and at least 3 or 4 years of planning. One of the leading causes of drum replacement has been the cost associated with repairs and unexpected shutdowns due to bulge-induced damage. An assessment...

... Abstract Coke drums are large pressure equipment critical to the Delayed Coking Unit (DCU) of refineries, which are used for the carbonization reaction involving dehydrogenation, rearrangement and polymerization. Due to the severe fatigue loading, high temperature and corrosive environment...

.... This paper will address this problem through the lens of two real-world pressure vessels, demonstrate the limitations of legacy approaches, and discuss the benefits of running structural simulations in real time. hydroprocessing coke drum reactor refining chemicals digital twin asset integrity...

... Abstract Low-cycle fatigue failure has been widely accepted as the key mechanism causing damages of coke drums during cyclic thermal-mechanical loadings. Common damages of coke drums known as bulging and cracking are associated with accumulative plasticity caused by thermal and mechanical...

... analyses included stability analysis of the coke drum, development of a robust and technical viable repair plan, design of a lifting & rigging system to enable repair in the field, controlled deposition welding (CDW) approach, and detailed description of non-destructive examination (NDE) techniques...

... Abstract Coke drums are pressure vessels used in the delayed coking process at oil refineries, which transform heavy residual oil into light-weight hydrocarbon molecules and solid coke through thermal cracking. Due to the severe thermal and mechanical loadings during operation, these vessels...

... Abstract The coke drum is subjected to a combination of thermal-mechanical loads during operation, so its safety and reliability must be considered in actual production. In each production cycle, the thermal stress generated by temperature fluctuations in the coke drum is the main cause...

... Abstract Weld overlay is a repair method that has been used over the last 10 years to limit the growth of bulges and to extend the remaining life of delayed coking drums. Different refinery operators have used varied approaches, ranging from localized patches on specific regions of concern...

.... These sharpness growth rates were subsequently studied and their relationship with overall cycle times analyzed. The study also shows that individual coke drums can experience different sharpness growth rates and there can be a distribution of these rates. To determine when repairs should be conducted, coke drum...

... Abstract Laser mapping is a well-accepted technique for obtaining surface profiles of coke drum walls to identify bulges. The resulting data is used to track and trend vessel distortions and mapped to illustrate the shape of the vessel from a base radius and or previous inspection. Monitoring...

... Coke drums are major pressure vessels used in petroleum refineries. In this paper, two simplified analytical models based on thermo-elasto-plastic constitutive theory have been developed to evaluate global and local stresses in coke drums during their operation cycles. The first model considers...