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Apex PetroConsultants, LLC

Ethylene Plant Reliability

12/26/2018

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In the most simplistic, yet effective, terms plant reliability is a measure of the actual production relative to its capability. The reliability, by definition, excludes any impacts of external factors. I will leave the discussion about the capability for another time. In this blog, I will focus on understanding reliability and its impact. Unplanned downtime and slowdowns, including hydrocarbon losses, impact reliability and have a significant economic impact. The economic impact is very large for current world-scale ethylene plants.
The reliability is dependent on operational parameters, equipment integrity programs, monitoring and control of process variables, and practices for managing changes. Operation parameters and control of process variables have the largest impact on reliability (as high as 60-70%). Most of the systems currently are focused on rigorous mechanical (equipment) integrity programs.
Reliability is determined by decisions made during the design, engineering, and construction of the facility. Equipment specifications and selection play an important role during project implementation. The approach for sparing, process monitoring/control, and specification/selection of plant hardware play an equally important role.
Once the plant starts producing, operational parameters change and can have a significant impact on reliability if the operation and maintenance fail to control and adjust the anticipated operating conditions as well as the asset integrity programs. This requires a fundamental understanding of the technology and the input of a multi-disciplinary team of experts.
While it is a common tendency to think of reliability as an extension of the maintenance function, the reality is that process technology experts along with other subject matter experts play a key role in solving the reliability issues in the plant.
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    Author

    Sanjeev Kapur is Principal Consultant at Apex PetroConsultants. He focuses on consulting/advising olefins based petrochemical businesses. He is a leading expert in petrochemicals and integration.

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