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D5001-23 – Standard Test Method Technical Guide
📐 Scope and Significance of ASTM D5001-23
ASTM D5001-23 is the definitive standard for assessing the wear aspects of the boundary lubrication properties of aviation turbine fuels on rubbing steel surfaces using the Ball-on-Cylinder Lubricity Evaluator (BOCLE). The standard explicitly authorizes two procedural configurations: one for a semi-automated instrument and another for a fully automated instrument. Per the standard’s scope, all values are stated in SI units and are to be regarded as standard.
The standard does not purport to address all safety concerns associated with its use. The user is responsible for establishing appropriate safety, health, and environmental practices prior to testing.
| 🟦 Referenced Document | 📏 Role in D5001-23 |
|---|---|
| D4175 Terminology | Provides standard definitions for petroleum, fuel, and lubricant terms used in the method. |
| D4306 Practice | Governs proper sample containers to prevent trace contamination of aviation fuel samples. |
| D6708 Practice | Assesses the statistical agreement between this test method and other related methods. |
| AISI E-52100 Steel | Specifies the chromium alloy steel required for the stationary test ball. |
| ISO 3290-1 | International standard governing the steel balls utilized in the BOCLE apparatus. |
⚙️ Test Materials and Hardware Specifications
The BOCLE apparatus operates with a loaded stationary ball pressed against a fluid-wetted rotating cylindrical test ring. The test ball is strictly specified as AISI E-52100 Chromium Alloy Steel, conforming to ISO 3290-1. The rotating test ring is fabricated from SAE 8720 steel. The Rockwell Hardness C scale (HRC) is a critical characteristic for validating these components against the standard’s requirements.
Strict adherence to ASTM D4306 for sample containers is essential. Aviation turbine fuels are highly susceptible to trace contamination, which can significantly alter the measured wear scar diameter and compromise test validity.
📊 Key Measured Properties and Terminology
Per Terminology D4175 and the specific definitions established in this standard, lubricity is a qualitative term that is quantified directly by the wear scar produced on the test ball.
| 🎯 Term | 📐 Definition & Measurement |
|---|---|
| Lubricity | The ability of a fluid to minimize friction between, and damage to, surfaces in relative motion under load. |
| Wear Scar Diameter (WSD) | The average diameter of the worn and abraded area produced on the test ball, measured in two specified directions (mm). This is the primary result of the test. |
| BOCLE Wear Scar | The specific type of wear scar generated by this test method on the AISI E-52100 test ball. |
The fundamental output of the test is the Wear Scar Diameter (WSD) in millimeters. A smaller WSD indicates superior boundary lubrication performance and a higher degree of surface protection provided by the aviation turbine fuel.
❓ Frequently Asked Questions
🔍 What does the acronym BOCLE stand for?
BOCLE stands for Ball-on-Cylinder Lubricity Evaluator. It is the specialized tribometer apparatus specified by this standard to measure the lubricity of aviation turbine fuels.
💡 What is the primary measurement reported by this test?
The primary measurement is the Wear Scar Diameter (WSD), reported in millimeters. It is calculated as the average diameter of the worn area on the test ball, measured in two specified perpendicular directions.
⚡ How many instrument configurations are permitted by this standard?
Two distinct instrument configurations are permitted: a semi-automated instrument and a fully automated instrument. The standard validates both procedures for generating officially reportable results.
📌 What specific steel alloy is specified for the test ball?
The stationary test ball must be manufactured from AISI E-52100 Chromium Alloy Steel, in strict accordance with the requirements of ISO 3290-1 for steel balls.