Petroleum Measurement Tables (ASTM D 1250).pdf

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How to Use Petroleum Measurement Tables (ASTM D 1250) for Accurate Oil and Gas Calculations

Petroleum Measurement Tables (ASTM D 1250) are a set of standardized tables that provide conversion factors for various physical properties of petroleum products, such as density, volume, temperature, pressure, and viscosity. These tables are widely used in the oil and gas industry to measure and calculate the quantity and quality of crude oil, refined products, and natural gas liquids.

In this article, we will explain what Petroleum Measurement Tables are, how they are derived, and how to use them correctly. We will also provide you with a link to download the PDF version of the tables for your convenience.

What are Petroleum Measurement Tables?

Petroleum Measurement Tables are based on the ASTM D 1250 standard, which was first published in 1948 by the American Society for Testing and Materials (ASTM). The standard was developed to provide a uniform and consistent method of converting physical properties of petroleum products from one unit system to another.

The tables cover a wide range of petroleum products, such as crude oil, gasoline, diesel, jet fuel, kerosene, lubricating oil, asphalt, and liquefied petroleum gas (LPG). The tables also include correction factors for the effects of temperature and pressure on the volume and density of petroleum products.

The tables are divided into six volumes, each covering a different product group and unit system. The volumes are:

Volume I: Table 5A - Generalized Crude Oils - Correction of Observed API Gravity to API Gravity at 60°F; Table 6A - Generalized Crude Oils - Correction of Volume to 60°F Against API Gravity at 60°F
Volume II: Table 5B - Generalized Products - Correction of Observed API Gravity to API Gravity at 60°F; Table 6B - Generalized Products - Correction of Volume to 60°F Against API Gravity at 60°F
Volume III: Table 23A - Generalized Crude Oils - Correction of Observed Density to Density at 15°C; Table 24A - Generalized Crude Oils - Correction of Volume to 15°C Against Density at 15°C
Volume IV: Table 23B - Generalized Products - Correction of Observed Density to Density at 15°C; Table 24B - Generalized Products - Correction of Volume to 15°C Against Density at 15°C
Volume V: Table 53A - Generalized Crude Oils - Correction of Observed API Gravity to API Gravity at 60°F; Table 54A - Generalized Crude Oils - Correction of Volume to 60°F Against API Gravity at 60°F; Table 53B - Generalized Products - Correction of Observed API Gravity to API Gravity at 60°F; Table 54B - Generalized Products - Correction of Volume to 60°F Against API Gravity at 60°F
Volume VI: Table 53C - Liquefied Petroleum Gas or Natural Gasoline - Correction of Volume to Equivalent Liquid Volume at Base Conditions; Table 54C - Liquefied Petroleum Gas or Natural Gasoline - Correction of Equivalent Liquid Volume at Base Conditions to Equivalent Liquid Volume at Observed Conditions

You can download the PDF version of the Petroleum Measurement Tables from the ASTM website here.

How are Petroleum Measurement Tables derived?

Petroleum Measurement Tables are derived from empirical data obtained from laboratory experiments and field measurements. The data are then fitted into mathematical equations that describe the relationship between physical properties and unit systems. The equations are then used to generate the tables that provide conversion factors for various combinations of physical properties and unit systems.

The equations used to derive the tables are based on several assumptions and simplifications, such as:

The petroleum products are homogeneous and isotropic fluids.
The petroleum products are incompressible liquids or ideal gases.
The effects of dissolved gases or solids on the physical properties are negligible.
The effects of thermal expansion or contraction on the volume are negligible.
The effects of surface tension or capillarity on the volume are negligible.

These assumptions and simplifications may not always hold true in real situations, especially for complex mixtures or non-ideal fluids. Therefore, the tables may not provide accurate conversion factors for all cases. The tables should be used with caution and only as a guide. The users should always verify the results with actual measurements or alternative methods whenever possible.

How to use Petroleum Measurement Tables correctly?

To use Petroleum Measurement Tables correctly, you need to follow these steps:

Determine the product group and unit system that you want to use. For example, if you want to convert the volume and density of crude oil from metric units to U.S. customary units, you need to use Volume I or Volume V.
Determine the physical properties that you want to convert. For example, if you want to convert the volume and density of crude oil from metric units to U.S. customary units, you need to use the observed density in kg/m3 and the observed volume in m3.
Find the appropriate table that corresponds to your product group, unit system, and physical properties. For example, if you want to convert the volume and density of crude oil from metric units to U.S. customary units, you need to use Table 24A in Volume III or Table 54A in Volume V.
Find the correction factor that corresponds to your observed physical property value. For example, if you want to convert the volume and density of crude oil from metric units to U.S. customary units, and your observed density is 850 kg/m3, you need to find the correction factor for density at 15°C in Table 24A or Table 54A.
Multiply your observed physical property value by the correction factor to obtain the converted physical property value. For example, if you want to convert the volume and density of crude oil from metric units to U.S. customary units, and your observed density is 850 kg/m3, you need to multiply it by the correction factor for density at 15°C in Table 24A or Table
Repeat the same process for the other physical property that you want to convert. For example, if you want to convert the volume and density of crude oil from metric units to U.S. customary units, and your observed volume is 1000 m3, you need to find the correction factor for volume at 15°C in Table 24A or Table 54A, and multiply it by your observed volume to obtain the converted volume at 60°F in barrels, which is 6290 bbl.

Here is an example of how to use Petroleum Measurement Tables to convert the volume and density of crude oil from metric units to U.S. customary units:

Physical Property	Unit System	Observed Value	Correction Factor	Converted Value
Density	Metric	850 kg/m3	0.9995 (Table 24A or Table 54A)	32.1 API
Volume	Metric	1000 m3	6.290 (Table 24A or Table 54A)	6290 bbl

Note that the correction factors may vary slightly depending on which table you use. For example, the correction factor for density at 15°C in Table 24A is 0.9995, while the correction factor for density at 60°F in Table 54A is 0.9996. The difference is due to rounding errors and interpolation methods. You should use the table that matches your unit system and product group as closely as possible.

Conclusion

Petroleum Measurement Tables are a useful tool for converting physical properties of petroleum products from one unit system to another. They are based on the ASTM D 1250 standard, which provides a uniform and consistent method of conversion. However, they are not perfect and may not provide accurate results for all cases. You should always verify the results with actual measurements or alternative methods whenever possible.

If you want to learn more about Petroleum Measurement Tables, you can download the PDF version from the ASTM website here. You can also contact us if you have any questions or need any assistance with your oil and gas calculations.