This stage in the refining process consists of breaking up the large molecules into smaller ones in order to produce lighter compounds. Processes involved include catalytic cracking and viscosity reduction (visbreaking)
EESiFlo North America, Terminology and Glossary: Oil & Gas Terms, Pennsylvania, USA 2002. flowmeterdirectory.com/flowmeter_terminology, (Mrtm/ Oil and Gas - Amer) {566}