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D287-22 – Standard Test Method Technical Guide
🧪 Test Method Overview
ASTM D287-22 standardizes API gravity measurement of crude petroleum and petroleum products using a glass hydrometer. This method applies to liquids with a Reid vapor pressure (RVP) of 14.696 psi (101.325 kPa) or less per Test Method D323. Hydrometer readings are taken at existing temperatures and corrected to 60 °F (15.56 °C) via the Adjunct to D1250 (API MPMS Chapter 11.1) tables. Values stated in inch-pound units are standard; SI units are for reference only.
This standard ensures consistent gravity measurements for custody transfer and quality control in the petroleum industry.
⚙️ Test Procedure and Calibration
Immerse a clean, calibrated glass hydrometer in the sample at a convenient test temperature. After stabilization, record the hydrometer reading and correct for meniscus effect, thermal glass expansion, and alternate calibration temperatures. The immersion depth must follow Practice D7962, and temperature sensors should be assessed for drift per D8164. Corrected readings are converted to API gravity at 60 °F using API MPMS Chapter 11.1 tables.
| 🔍 Parameter | 📐 Specification | 🎯 Application |
|---|---|---|
| Hydrometer Type | Glass hydrometer | API gravity measurement |
| Reference Temperature | 60 °F (15.56 °C) | Correction base |
| RVP Limit | 14.696 psi (101.325 kPa) | Sample eligibility |
| Correction Method | API MPMS Chapter 11.1 | Volume correction factors |
📊 Key Measured Properties and Calculations
Initial hydrometer readings must be recorded uncorrected. For readings at non-reference temperatures, corrections for meniscus, glass expansion, and temperature are applied using petroleum measurement tables. Calculations must be documented before using results for meter factor, base prover volume, or measurement ticket calculations. The standard notes that values at other than reference temperature are hydrometer readings, not density measurements.
The Adjunct to D1250 tables are not applicable to nonhydrocarbons or pure aromatics. Verify sample composition before use.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D287-22?
It covers API gravity determination for crude petroleum and petroleum products with a Reid vapor pressure of 14.696 psi or less.
💡 Why are corrections needed for hydrometer readings?
To account for meniscus effect, thermal glass expansion, and calibrate to the reference temperature of 60 °F.
⚡ Which standards are referenced in D287-22?
Key references include D323, D1250, D1298, D6822, D7962, D8164, and E1.
📌 What is the role of API MPMS Chapter 11.1?
It provides temperature and pressure volume correction factors for generalized crude oils and refined products.