Presentation Profile
Enhancing Jet Evaporation Methods for Precise Gum Content Measurement in Aviation and Automotive Fuels
Currently Scheduled: 10/15/2025 - 12:30 PM - 12:50 PM
Room: South Lobby
Main Author
Dr. Raj Shah - Koehler Instrument Company
- Angelina Precilla - Koehler Instrument Company
- Lei Andre Delos Reyes - Koehler Instrument Company
- Mojan Jafaripour - Koehler Instrument Company
- Stefan Lim - Koehler Instrument Company
Abstract:
Accurate quantification of gum content in fuels is critical to maintain engine reliability and prevent operational issues such as deposit formation, filter clogging, and component corrosion. This poster outlines advanced methodologies for determining gum content via the ASTM D381 jet evaporation test, emphasizing improvements in sample handling, instrumentation, and analytical controls. We highlight features of the Koehler Existent Gum Evaporation Bath, such as its built-in steam superheater, digital temperature regulation, and six-unit parallel testing capability, that streamline testing and reduce variability. Through a series of controlled experiments, we examine how trace metal contaminants (Cu, Fe, Ni, Zn, and Pb) accelerate gum formation in motor gasoline and gasohol blends over storage intervals (1, 2, and 4 weeks). Our data reveal that copper and iron exert the most pronounced effects on gum levels, underscoring the need for stringent metal deactivation strategies. Additionally, we discuss real-world implications of elevated gum contents in aviation turbine fuels, linking poor distribution practices to increased high-boiling residues and particulate matter, and reference Brazilian ANP regulations that cap gum at 5.0 mg/100 mL. Finally, best practices for minimizing oxidative gum precursors, including the use of antioxidants and stabilizers, are presented. Collectively, these enhancements to the ASTM D381 procedure enable laboratories to produce more reliable, reproducible gum measurements, ultimately safeguarding fuel system integrity and engine performance.
