Diesel Fuel D6, also known as Residual Fuel Oil or Bunker Fuel, is a heavy petroleum distillate typically used in large-scale industrial operations and marine applications. Unlike lighter diesel grades such as D2 or EN590, D6 has a high viscosity and higher sulfur content, making it suitable for power generation, shipping, and heavy machinery in regions with less restrictive environmental regulations. D6 requires preheating before use to reduce its viscosity and allow efficient combustion in large engines and industrial burners.
Typical properties include:
| Specification | Value |
|---|---|
| Standard | ASTM D396, ISO 8217 (residual fuel oil grades) |
| Sulfur Content | 0.5% to 5% by weight (depending on regional regulations and supply grade) |
| Cetane Index | Typically 30 – 40 (lower than lighter diesels) |
| Density at 15°C | 930 – 1010 kg/m³ |
| Viscosity at 40°C | 5.0 – 50 mm²/s (requires heating before use) |
| Flash Point | ≥ 66 °C |
| Pour Point | 10 °C to 30 °C (varies by crude origin) |
| Distillation Range | Residual fraction, above 350°C |
| Calorific Value | ~40 – 42 MJ/kg |
Values may vary depending on refinery process, crude source, and compliance with IMO and regional standards.
• Heavy, viscous fuel requiring preheating before pumping and combustion.
• High energy content, suitable for large-scale industrial engines.
• Contains higher levels of sulfur and impurities compared to lighter diesel fuels.
• Cost-effective fuel for heavy-duty applications where ultra-clean combustion is not mandated.
• Used in regions or sectors where environmental regulations are less strict.
• Marine fuel (bunker fuel) for large ships, cargo vessels, and tankers.
• Power generation in heavy fuel oil (HFO) fired power plants.
• Industrial furnaces and boilers requiring high-BTU heavy fuel.
• Large stationary diesel engines in industrial applications.
• Blending stock for producing other fuel oil grades.
Diesel Fuel D6 is usually supplied in bulk due to its heavy nature:
• Ocean tankers and barges for international shipping
• Pipelines and terminals for large-scale distribution
• On-site storage tanks at marine ports and industrial facilities
• Classified as a combustible liquid – handle with proper care.
• Requires preheating systems for pumping, transfer, and combustion.
• Store in dedicated heated storage tanks to maintain fluidity.
• Use PPE (gloves, goggles, protective clothing) during handling.
• Ensure compliance with IMO 2020 sulfur cap regulations (≤0.5% sulfur) for international marine transport.
• Follow guidelines of ASTM, ISO, API, and MSDS for safe handling
Diesel Fuel D6, also known as Residual Fuel Oil or Bunker Fuel, is a heavy petroleum distillate typically used in large-scale industrial operations and marine applications. Unlike lighter diesel grades such as D2 or EN590, D6 has a high viscosity and higher sulfur content, making it suitable for power generation, shipping, and heavy machinery in regions with less restrictive environmental regulations. D6 requires preheating before use to reduce its viscosity and allow efficient combustion in large engines and industrial burners.
Typical properties include:
| Specification | Value |
|---|---|
| Standard | ASTM D396, ISO 8217 (residual fuel oil grades) |
| Sulfur Content | 0.5% to 5% by weight (depending on regional regulations and supply grade) |
| Cetane Index | Typically 30 – 40 (lower than lighter diesels) |
| Density at 15°C | 930 – 1010 kg/m³ |
| Viscosity at 40°C | 5.0 – 50 mm²/s (requires heating before use) |
| Flash Point | ≥ 66 °C |
| Pour Point | 10 °C to 30 °C (varies by crude origin) |
| Distillation Range | Residual fraction, above 350°C |
| Calorific Value | ~40 – 42 MJ/kg |
Values may vary depending on refinery process, crude source, and compliance with IMO and regional standards.
• Heavy, viscous fuel requiring preheating before pumping and combustion.
• High energy content, suitable for large-scale industrial engines.
• Contains higher levels of sulfur and impurities compared to lighter diesel fuels.
• Cost-effective fuel for heavy-duty applications where ultra-clean combustion is not mandated.
• Used in regions or sectors where environmental regulations are less strict.
• Marine fuel (bunker fuel) for large ships, cargo vessels, and tankers.
• Power generation in heavy fuel oil (HFO) fired power plants.
• Industrial furnaces and boilers requiring high-BTU heavy fuel.
• Large stationary diesel engines in industrial applications.
• Blending stock for producing other fuel oil grades.
Diesel Fuel D6 is usually supplied in bulk due to its heavy nature:
• Ocean tankers and barges for international shipping
• Pipelines and terminals for large-scale distribution
• On-site storage tanks at marine ports and industrial facilities
• Classified as a combustible liquid – handle with proper care.
• Requires preheating systems for pumping, transfer, and combustion.
• Store in dedicated heated storage tanks to maintain fluidity.
• Use PPE (gloves, goggles, protective clothing) during handling.
• Ensure compliance with IMO 2020 sulfur cap regulations (≤0.5% sulfur) for international marine transport.
• Follow guidelines of ASTM, ISO, API, and MSDS for safe handling
