Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
D2069-91 – Standard Test Method Technical Guide
📋 Scope and Classification of Marine Fuels
ASTM D2069-91 (Reapproved 1998), an American National Standard, provides the specification for petroleum fuels used in marine diesel engines and boilers. This standard is technically equivalent to ISO 8217:1987(E) and establishes the required properties at the time and place of custody transfer. The specification covers nineteen distinct categories of marine fuel, including four distillate fuel grades (DMX, DMA, DMB, and DMC) and fifteen residual fuel categories, providing comprehensive coverage for worldwide marine fuel requirements. The ISO designation system for these nineteen categories has been retained in this standard.
The standard excludes fuels intended for marine gas turbine applications, which are covered under ASTM D2880 (or ISO 4261). This specification does not guarantee the availability of all fuel categories at every port, and it does not supersede more restrictive national or local regulations. Flash point requirements comply with the International Maritime Organization (IMO) SOLAS Convention, 1974, Amendment 1, Chapter II-2, Regulation 15. Values stated in SI units are to be regarded as standard.
⚙️ Test Methods and Property Requirements
Conformance to ASTM D2069-91 requires testing of marine fuel properties using standardized ASTM test methods. Each property is critical to ensuring safe and efficient operation of marine diesel engines and boilers. The standard references numerous ASTM methods for evaluating fuel characteristics at the time of custody transfer.
| 🟦 Test Method | 📏 Property Measured | 📐 Application |
|---|---|---|
| D 93 | Flash Point (Pensky-Martens Closed Cup) | Safety classification, all grades |
| D 445 | Kinematic Viscosity | Flow and atomization, all grades |
| D 97 | Pour Point | Low-temperature handling, all grades |
| D 482 | Ash Content | Combustion residue, all grades |
| D 95 | Water Content (Distillation) | Fuel purity, all grades |
| D 473 | Sediment (Extraction Method) | Fuel cleanliness, residual grades |
| D 189 / D 524 | Carbon Residue (Conradson / Ramsbottom) | Coking tendency, all grades |
| D 1298 | Density, Relative Density, or API Gravity | Fuel metering and storage, all grades |
💡 Technical Tip: Viscosity is the primary classification parameter for residual marine fuels under both ASTM D2069-91 and ISO 8217. Distillate grades are classified at 40°C, while residual grades use kinematic viscosity at 100°C. Proper viscosity selection is critical for fuel injection system performance and complete combustion.
📊 Fuel Categories and Grade Designations
The standard retains the ISO 8217 designation system for all nineteen fuel categories. The four distillate fuel grades are intended for diesel engines requiring cleaner, lower-viscosity fuels. The fifteen residual fuel categories, designated with RMA through RMF prefixes and viscosity grades from 10 to 700 mm²/s, cover the full spectrum of heavy fuel oils used in marine applications. Typical specifications for the distillate grades are shown below.
| 📐 Property | 🎯 DMX | 🎯 DMA | 🎯 DMB | 🎯 DMC |
|---|---|---|---|---|
| Kinematic Viscosity at 40°C, mm²/s | 1.4 – 5.5 | 1.5 – 6.0 | 2.0 – 11.0 | 10.0 – 15.0 |
| Flash Point, °C, min | 43 | 60 | 60 | 60 |
| Pour Point (winter), °C, max | −6 | −6 | −6 | −6 |
| Carbon Residue (Ramsbottom), % m/m, max | 0.20 | 0.20 | 0.30 | 2.50 |
| Ash, % m/m, max | 0.01 | 0.01 | 0.01 | 0.05 |
| Water, % v/v, max | 0.05 | 0.05 | 0.05 | 1.00 |
| Sediment, % m/m, max | — | — | 0.05 | 0.05 |
| Density at 15°C, kg/m³, max | — | 890 | 900 | 920 |
⚠️ Important Note: This specification does not imply the availability of all nineteen fuel categories at all ports. Local refining capabilities, crude oil supply variations, and regional regulations may limit the grades offered. Users should consult with suppliers regarding local availability and applicable national or local regulatory requirements.
❓ Frequently Asked Questions
🔍 What is the relationship between ASTM D2069-91 and ISO 8217?
ASTM D2069-91 is technically equivalent to ISO 8217:1987(E). The ASTM format for specifications was used in development, and equivalent ASTM test methods replaced the ISO standards where possible. The ISO designation system for all nineteen fuel categories has been retained throughout this standard.
💡 How many fuel categories are defined in this specification?
Nineteen fuel categories are defined: four distillate fuel grades (DMX, DMA, DMB, DMC) and fifteen residual fuel categories covering viscosity grades from 10 to 700 mm²/s at 100°C. This comprehensive structure accommodates variations in crude oil supplies, refining methods, and ship machinery requirements across global markets.
⚡ What flash point requirements apply under this standard?
This standard takes into account the international flash point requirements of the IMO SOLAS Convention, 1974, Amendment 1, Chapter II-2, Regulation 15. Distillate grades have minimum flash points ranging from 43°C for DMX to 60°C for DMA, DMB, and DMC. Residual fuel grades generally require a minimum flash point of 60°C.
📌 Does this standard cover marine gas turbine fuels?
No. Marine fuels intended for gas turbine use are explicitly excluded from ASTM D2069-91. Gas turbine fuels for non-aviation marine use are covered by ASTM D2880 (or equivalent ISO 4261). This specification is strictly limited to fuels for marine diesel engines and boilers.