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Why Vacuum Unit Fired Heaters Coke

A description of the internal workings of vacuum heaters and the causes of coke formation within them. Case studies show how to avoid localised hot spots in order to maintain yield targets and increase run lengths.
Tags: CDU, VDU

Vacuum Unit Design Effect on Operating Variables

To revamp vacuum units, process modelling and equipment design know-how are needed, and the understanding of connected equipment performance can lead to higher gasoil quality and yields, with fewer unscheduled shutdowns.
Tags: CDU, VDU

Consider Comprehensive CPD Efforts to Cut Costs

With performance real-time field data, designers can devise process retrofits at the conceptual stage that control project scope and minimize engineering revisions during FEED and detailed engineering.
Tags: CDU, VDU, featured

Understanding Centrifugal Compressor Performance in a Connected Process System

Understanding how FCC and Delayed Coker wet gas compressor capacity is impacted by system pressure drop allows low cost changes to be made without expensive compressor modifications. In many instances high pressure drop caused by poor system design reduces unit ...
Tags: FCCU

Revamping Conceptual Process Design

With desirability of getting the maximum use out of existing equipment when revamps are planned - not least to minimise investment costs - a rigorous approach to CPD is required to avoid scope growth.
Tags: CDU, VDU

Diagnose Flooding Columns Efficiently

Using field pressure data, a refiner made a low-capital modification on a crude distillation column to increase throughput without a shutdown.
Tags: CDU, VDU

Vacuum Unit Pressure Control: Impact on Refinery Profitability

Good vacuum column pressure control is essential to a successful revamp when vacuum column diameter is the primary unit limit. Poor pressure control can lead to massive entrainment of VTB into HVGO. This is especially significant with heavy crudes with ...
Tags: CDU, VDU

Vacuum Unit Fired Heater Coking- Avoid Unscheduled Shutdowns

Poor heater design leads to unscheduled Vacuum Unit fired heater shutdowns due to coke formation. Oil film temperature and residence time are the variables that determine the rate of coking for a given crude oil blend. Proper heater design and ...
Tags: CDU, VDU

Revamping FCC Units: Debutanizer Reboiler Fouling

FCC debutanizer reboiler shell-side fouling causes unscheduled outages and can make bundle removal difficult or impossible. Expensive solutions such as the addition of a parallel reboiler system only treat the symptoms, not the causes, of the problem. FCC debutanizer fouling ...
Tags: FCCU

Low-cost Methods to Improve FCCU Energy Efficiency

The first step to finding low-cost ways of improving FCC unit efficiency under new environmental regulations is to determine the true limits of the existing process equipment and flow scheme, say the authors. They describe ways of influencing heat source ...
Tags: FCCU