Liquid Fuels for Power Generation: Chemical Properties & Lab Testing

Overview of Liquid Fuels in Power Generation

Liquid fuels—including diesel, heavy fuel oil (HFO), light fuel oil (LFO), kerosene, and biodiesel blends—power combustion turbines, reciprocating engines, and boiler systems used in stationary power generation worldwide. The quality and composition of these fuels directly affect engine and turbine performance, emissions, maintenance intervals, and equipment longevity.

Rigorous fuel testing is essential for utilities, independent power producers, off-grid installations, and backup power systems across the energy and industrial sectors to ensure operational reliability and regulatory compliance.

Key Liquid Fuel Types for Power Generation

Diesel (No. 2 Distillate Fuel Oil)

The most widely used liquid fuel for reciprocating engines (generators, pump drives) and smaller combustion turbines. Governed by ASTM D975. Key properties include cetane number, viscosity, sulfur content, flash point, and cloud/pour point.

Heavy Fuel Oil (HFO / Residual Fuel)

Used in large marine-derived engines and industrial boilers due to its low cost. HFO requires preheating to reduce viscosity for pumping and injection. Key concerns: high viscosity, sulfur content, vanadium and sodium content (causes hot corrosion in turbines), and sediment and water.

Light Fuel Oil (LFO / No. 1 or No. 2 Fuel Oil)

Cleaner-burning than HFO; used in combustion turbines and industrial boilers where HFO’s contaminants are problematic.

Kerosene / Jet Fuel (Jet-A, JP-8)

Used in aviation-derivative gas turbines for power generation. Governed by ASTM D1655 and DEF STAN 91-091. Critical properties include freeze point, thermal stability, and lubricity.

Biodiesel Blends (B5, B20, B100)

Renewable diesel is produced from vegetable oils or animal fats. Governed by ASTM D6751 (pure biodiesel) and ASTM D7467 (B6–B20 blends). Key testing concerns: oxidation stability, cold flow properties, water and sediment, and material compatibility.

Critical Fuel Properties and Test Methods

Microbial Contamination in Stored Fuels

Diesel and HFO stored in tanks are susceptible to microbial contamination—bacteria and fungi that grow at the fuel-water interface, producing biofilms and acidic metabolites that degrade fuel quality and corrode tank bottoms. Testing for microbial contamination (ASTM E1259) and biocide treatment protocols are critical for long-term fuel storage management in standby and backup power applications.

Conclusion

Liquid fuels remain a cornerstone of reliable power generation, particularly for backup systems, remote installations, and peak-load support. However, their performance is highly dependent on fuel quality, composition, and storage conditions. Variations in properties such as viscosity, sulfur content, water contamination, and oxidation stability can significantly impact combustion efficiency, emissions, and equipment lifespan. Through rigorous testing aligned with industry standards, operators can ensure optimal performance, prevent costly failures, and maintain regulatory compliance. As the energy landscape evolves—with increasing use of cleaner fuels and biodiesel blends—robust fuel testing and monitoring will continue to play a vital role in ensuring efficient, safe, and sustainable power generation.

Why Choose Infinita Lab for Liquid Fuel Testing?

Infinita Lab provides comprehensive liquid fuel analysis for power generation applications, including full ASTM D975, D6751, and combustion turbine fuel specification compliance testing. Our nationwide accredited laboratory network delivers fast turnaround for both routine QC and detailed fuel characterisation.

Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote

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