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37 Articles Found

Crude Unit Start-ups: The Results of a High Liquid Level

Pressure-measurement techniques can avoid the dangers of rapidly changing flow rates and levels during start-up. Also, column internals directly above and below flash zones need to be designed for higher uplift forces.
Tags: CDU, VDU

Vacuum Ejector Performance Break

Understanding vacuum ejector performance is the key to maintaining reliability and distillate yields. A low VGO yield may result from a breaking ejector system, but bypassing a fouled inter-condenser can restore lost yield.
Tags: CDU, VDU

Maximise VGO Yield

Fundamental operating principles of vacuum ejectors are discussed, including incidents leading to sudden increases in ejector suction pressure, known as breakthrough. Proper ejector component selection and design can significantly prevent breakthrough and increase VGO yield, while reducing resid production.
Tags: CDU, VDU

Crude Unit Preflash Drums and Columns

Preflash drums and preflash columns have significant effect on crude charge hydraulics. The reason for using preflash equipment are discussed, including general design considerations and problems that are created if they are designed incorrectly.
Tags: CDU, VDU

Crude Column Revamp Using Radial Temperature Profiles

Designers need to be aware of all the factors influencing packed bed performance such as feed zone mixing problems. Accurate assessment of temperature variations above and below fractionation zones can pinpoint efficiency problems.
Tags: CDU, VDU

Managing Vanadium from High Metals Crude Oils

Process and equipment design improvements, particularly with regard to crude unit and delayed coker distillation column performance, can reduce metals content. Optimization of components, including vacuum column stripping section and coker main fractionator wash zones, should be considered.
Tags: CDU, VDU

Designing a Crude Unit Heat Exchanger Network

Preheat train design for heavy Canadian crudes can be very challenging, requiring an approach not normally required with other crudes.
Tags: CDU, VDU

Vacuum Unit Performance

Inaccurate feed characterisation and process modelling errors are major contributors to poor performance in a vacuum unit as refiners switch to heavier crude types.
Tags: CDU, VDU

Designing the CDU/VDU for Opportunity Crudes

New units for processing heavy crudes should not be designed using conventional practices or run length with be short, and product yields & quality poor.
Tags: CDU, VDU

Desalting Heavy Canadian Crude

Heavy Canadian crudes pose serious challenges during the process of desalting due to their inherent properties. This article presents an overview of critical desalter design and operating considerations to overcome various operational issues.
Tags: CDU, VDU