an employee-owned company

Coke Drums & Cokers

Stress Engineering Services provides complete Coke Drum engineering support from life assessment and extension to the design of new drums. We draw on our extensive design, testing, analysis, measuring, and monitoring capabilities, along with our vast industry experience, to solve problems that improve plant integrity, safety, and profitability.

Our engineers and technicians are skilled in a variety of engineering disciplines and areas of expertise including failure analysis, metallurgy, acoustic-emissions testing, welding engineering, fitness for service, and forensics.

Coke Drum Condition
Life-Assessment and Extension

We assist plant operators with problems that arise from the harsh demands of refinery operation, shorter cycles, and zero-leak tolerances. We utilize state-of-the-art technology and more than 30 years of applied experience to monitor, assess and extend the life and reliability of delayed coker components, especially coke drums. Our objective is to give operators a better understanding of how to optimize daily operation, inspection, and maintenance practices to maximize both production and drum life.

Health-Monitoring Systems

Stress has installed permanent “Health Monitoring Systems” on many coke drums to provide critical feedback on damage accumulation in the skirt and shell for each cycle of operation. Structural reliability can be improved by studying cause-and-effect relationships between operation and structural response. By using these data to assess and redesign these systems, we provide operators with essential information that can increase efficiency and also reduce the number of failures.

Avoids Internal Inspection…..Extends Life

Under current engineering standards, if a vessel is inspected by AET and no significant defects are found, a plant has the option to continue operating the equipment for an extended number of years until the next inspection date.
  • Measure how fast components degrade over time
  • Predict time to repair or replace
  • Extend time between repair and replacement
  • Optimize daily operation to maximize production
  • Improve “Best Practices” and operational safety

Coke Drum Design and Modeling

Most existing coke drums were not designed for low-cycle fatigue, which did not become an issue until drums began operating on shorter cycles which increased local stresses above yield causing cracking. Even newer drums have experienced through-wall cracking in as little as 5 years. In addition, actual measured transients, which are much more severe than anticipated, were not used for these designs.

Stress Engineering personnel have been involved in the design of the latest state-of-the-art coke drums and can help you design and build drums that last.