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D473-22 – Standard Test Method Technical Guide
The ASTM D473-22 standard, also recognized as Manual of Petroleum Measurement Standards (MPMS) Chapter 10.1, specifies the method for determining sediment in crude oils and fuel oils through toluene extraction. This test is critical for assessing product quality and compliance in custody transfer operations and is under the joint jurisdiction of ASTM Committee D02 and API Committee on Petroleum Measurement.
📐 Scope and Applicability
This test method covers the determination of sediment in crude oils and fuel oils by extraction with toluene. The precision has been established for sediment levels ranging from 0.01 % to 0.40 % mass, although higher levels may be determined. The values stated in SI units are regarded as standard. For definitions of terms, refer to Terminology D4175 and API MPMS Chapter 1.
The standard is applicable to manual and automatic sampling as outlined in Practices D4057 and D4177. Proper sample mixing per Practice D5854 is essential for representative results.
⚙️ Extraction Procedure
The test involves extracting a test portion of a representative oil sample contained in a refractory thimble with hot toluene until the residue reaches constant mass. The mass of the residue, calculated as a percentage, is reported as sediment by extraction. Constant mass ensures complete removal of soluble material.
| 🟦 Parameter | 📏 Specification |
|---|---|
| Sample Matrix | Crude oils and fuel oils |
| Solvent | Toluene (hot) |
| Extraction Vessel | Refractory thimble |
| Endpoint Criterion | Constant mass of residue |
| Sediment Range | 0.01 % to 0.40 % mass |
⚠️ Safety Warning: Toluene is flammable and toxic. Use in a well-ventilated area or under a fume hood, and wear appropriate personal protective equipment. See specific warning statements in Sections 6.1.1.6 and 7.1 of the standard.
📊 Precision and Data Interpretation
The precision of this test method applies to sediment levels from 0.01 % to 0.40 % mass. Reporting of results must follow Practice E29 for significant digits. Precision for recycled oils and crankcase oils has not been determined and requires additional validation.
| 🟦 Sediment Level | 🎯 Applicable Range |
|---|---|
| Lower Limit | 0.01 % mass |
| Upper Limit | 0.40 % mass |
| Extended Range | Not validated for precision |
💡 Tip: Ensure thorough mixing of the sample per Practice D5854 to obtain a representative test portion. Verify constant mass by repeated heating, cooling, and weighing cycles.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D473-22?
This standard covers the determination of sediment in crude oils and fuel oils by toluene extraction, with precision for sediment levels from 0.01% to 0.40% mass.
💡 How is the extraction performed?
The test portion is placed in a refractory thimble and extracted with hot toluene until the residue reaches constant mass. The residue mass is then calculated as a percentage.
⚡ What safety precautions are needed?
Toluene is flammable and toxic. Use personal protective equipment, proper ventilation, and follow all safety warnings in the standard, particularly those in Sections 6.1.1.6 and 7.1.
📌 What is the precision range for this method?
The precision applies to sediment levels between 0.01% and 0.40% mass. Precision for recycled oils and crankcase oils is unknown.