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D633-11 – Standard Test Method Technical Guide
ASTM D633-11 provides a volume correction table for road tar to adjust volumes measured at various temperatures to a standard base temperature of 60°F (15.6°C). This standard is essential for custody transfer and accounting operations in the tar industry.
📐 Scope and Application
The table, prepared by the National Institute of Standards and Technology (NIST), is designed for reducing volumes of road tar to the basis of 60°F (15.6°C) when extreme accuracy is not required. It shows the volume occupied at 60°F by a quantity of material occupying unit volume at the indicated temperature. The values stated in inch-pound units are to be regarded as the standard.
This standard is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and references ASTM D490 for Specification for Road Tar.
📊 Volume Correction Table
Table 1 below lists the multiplier (M) for reducing volumes to the base temperature of 60°F (15.6°C) for observed temperatures ranging from 0°F to 245°F.
| 🌡️ Temperature (°F) | 🌡️ Temperature (°C) | 📏 Multiplier (M) |
|---|---|---|
| 0 | -17.78 | 1.0183 |
| 35 | 1.67 | 1.0076 |
| 70 | 21.11 | 0.9970 |
| 105 | 40.56 | 0.9867 |
| 140 | 60.00 | 0.9766 |
| 175 | 79.44 | 0.9657 |
| 210 | 98.89 | 0.9589 |
| 245 | 118.33 | 0.9474 |
⚙️ Significance and Use
Tars change in volume with changes in temperature, often being loaded or transferred at widely varying temperatures. Volume correction factors are used to adjust bulk volumes measured at those temperatures to corresponding volumes at a base temperature of either 60°F or 15.6°C for custody transfer and accounting operations. The correction factors provided in this table have proven to be sufficiently accurate for the intended purposes.
The coefficient of expansion for Specification D490 Type RT-12 at 60°F (15.6°C) per degree F is 0.00030.
💡 Note: This table is intended for use when extreme accuracy is not required. For more precise measurements, refer to the full standard or detailed calibration tables.
❓ Frequently Asked Questions
🔍 How is the volume correction table used?
The table provides multipliers to adjust the volume of road tar measured at a given temperature to the equivalent volume at 60°F (15.6°C). Multiply the observed volume by the corresponding multiplier from the table to obtain the corrected volume.
💡 What is the base temperature for volume correction in this standard?
The base temperature is 60°F (15.6°C). All volumes are corrected to this standard temperature for consistency in custody transfer and accounting.
⚡ What is the coefficient of expansion for road tar according to this standard?
For Specification D490 Type RT-12, the coefficient of expansion at 60°F (15.6°C) is 0.00030 per degree Fahrenheit.
📌 What other standards are referenced in ASTM D633-11?
The standard references ASTM D490 for Specification for Road Tar, which defines the type of tar for which the correction factors are intended.