This chart serves as a comprehensive visual guide to the complex processes involved in petroleum refining. Authored by William L. Leffler, a recognized expert in the field, the chart distills essential information regarding crude oil processing, conversion, and treatment into a readily understandable format. It is designed to provide a clear overview of the interconnected units and operations within a modern refinery, highlighting key chemical and physical transformations.

This chart is a valuable reference tool for professionals and students in the petroleum and chemical engineering industries. Its strength lies in its ability to present complex refining processes in a clear, organized, and visually accessible manner. The detailed schematic and flow diagrams facilitate a quick understanding of refinery operations and the relationships between different units.