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Process Equipment Specification and Selection

Process design as well as equipment specifications and selection can cause unintended problems following unit revamps. Identification of the true constraints may result in significant capital savings.
Tags: FCCU

Centrifugal Compressor Operations

The wet gas compressor is used as an example in this article reviewing compressor performance, operating conditions and basic control philosophy - an aid to understanding the interactions influencing compressor performance and control.
Tags: FCCU

FCC Gas Concentration Unit Stripper Revamp

Unit charge rate and reactor conversion were increased by elimination of stripper column flooding. Chemical-grade propylene specifications were met and C2 excursions in mixed C2/C3 streams were eliminated.
Tags: FCCU

Main Fractionator Water Wash Systems

When properly designer and operated, main fractionator wash water systems can remove salt with little upset. Misconceptions concerning the minimum column overhead temperature and operation when producing FCC heavy naphtha are discussed.
Tags: FCCU

Fast-tracking an FCC Revamp

The design, detailed engineering and installation of one revamp took just four-and-a-half months. Unit feed rate, product recovery and product quality objectives were all met after the revamp.
Tags: FCCU, featured

Steam Reboiler System Operations

Basic heat exchange principles are used to explain gas plant thermosiphon reboiler hydraulic constraints. Field measurements help clarify "off-design" operations that were not apparent and were causing high condensate levels.
Tags: FCCU

Catalyst Changes, Downstream Improvements Increase FCC Propylene Yields

Increasing propylene yields from an FCC can be an attractive alternative to a steam cracker. Reactor and catalyst system changes can lead to much higher propylene yields than conventional FCC operations. Increasing propylene yields place additional demands on the gas ...
Tags: FCCU

Understanding Unit Pressure Balance Key to Cost-effective FCC Revamps

FCC pressure balance is one of the key operating parameters that set catalyst circulation, unit charge rate, and conversion. Quantifying the individual system component pressure drops and the relative cost of reducing them allows cost-effective revamps to be implemented. Several ...
Tags: FCCU

Revamp Improves FCC Performance at BP's Texas City Refinery

BP Texas City revamped their No. 1 FCC main fractionator to improve fractionation, reduce pressure drop and lower naphtha sulfur content. Following the revamp the unit was able to increase capacity and operate at maximum conversion. Careful pre-engineering data gathering ...
Tags: FCCU

Pump Cativation Caused By Entrained Gas

Here’s how the problem was solved on an FCC main fractionator.
Tags: FCCU