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D613-24 – Standard Test Method Technical Guide
📐 Test Method Overview and Scope
This standard test method, D613-24, covers the determination of the cetane number of diesel fuel oil using a standardized single cylinder, four-stroke cycle, variable compression ratio, indirect injected diesel engine. The cetane number scale is arbitrary from 0 to 100, with typical testing in the range of 30 to 65 cetane number. The values for operating conditions are stated in SI units as the standard, with historical inch-pound units provided in parentheses for information.
| 🟦 Parameter | 📏 Value |
|---|---|
| Designation | D613-24 |
| Cetane Number Scale | 0 to 100 |
| Typical Test Range | 30 to 65 |
| Unit System | SI (inch-pound historical) |
⚙️ Test Procedure and Engine Specifications
The test method utilizes a standardized engine designed for cetane number determination. The engine is a single cylinder, four-stroke cycle, variable compression ratio, indirect injected diesel engine. Due to extensive tooling, engine measurements continue to be in inch-pound units, but all operating conditions are specified in SI units. The procedure involves comparing the ignition performance of the test fuel to reference fuels under controlled conditions.
| ⚡ Engine Component | 🔧 Specification |
|---|---|
| Cylinders | Single |
| Cycle | Four-stroke |
| Compression Ratio | Variable |
| Injection | Indirect |
📊 Key Measured Properties and Terminology
The primary measured property is the cetane number (CN), which is a measure of the ignition performance of diesel fuel oil. This is determined by comparing the test fuel to reference fuels in the standardized engine. The standard also defines accepted reference value (ARV) as a reference for comparison, derived from scientific principles or collaborative work. The cetane number scale covers the range from 0 to 100, with typical testing between 30 and 65.
⚠️ Safety Information: This standard does not purport to address all safety concerns. It is the responsibility of the user to establish appropriate safety, health, and environmental practices. For more specific warning statements, see Annex A1 of the standard.
💡 Unit Note: While the standard states values in SI units as the standard, engine measurements are in inch-pound units due to extensive tooling. Always refer to the SI values for operating conditions unless otherwise specified.
❓ Frequently Asked Questions
🔍 What is the cetane number scale used in this standard?
The cetane number scale covers the range from 0 to 100, but typical testing is performed in the range of 30 to 65 cetane number.
💡 What type of engine is used for the test?
The test uses a standard single cylinder, four-stroke cycle, variable compression ratio, indirect injected diesel engine.
⚡ How is the cetane number determined?
The cetane number is determined by comparing the ignition performance of the test fuel to reference fuels in the standardized engine.
📌 Why are inch-pound units still used in the engine measurements?
Engine measurements continue to be in inch-pound units because of the extensive and expensive tooling that has been created for these units.