ROFA

Laboratory & Process Analyzers

Mag. Matthias Fiedler

A-3420 Kritzendorf

Laboratory & Process Analyzers

A-3420 Kritzendorf

ASTM D1250-04 Software for PC

(Temperature and pressure volume correction factors for generalized crude oils, refined products, and lubricating oils.)

The ASTM D1250-04 Software for PC comprises three different modules:

**ASTM D1250-04 VCF**: Software to calculate density and volume from any temperature and pressure condition to base condition and any alternate temperature and pressure condition.**ASTM D1250-04 Tables**: Software to generate volume correction factors in tabular format as used in previous versions of the standard.**ASTM D1250-04 Regression**: Software to calculate density at 60°F and the thermal expansion factor at 60°F from measured density values.

**ASTM D1250-04 VCF**

First enter the observed temperature and pressure conditions and the measured density. The volume may be entered optionally. The “observed” condition is the temperature and pressure at which the density of a liquid is actually or assumed to have been measured. Calculations can then be performed to correct this observed density to any other temperature and pressure conditions. If the density has already been corrected to base conditions, you would enter the base temperature and pressure in the Observed Conditions fields. If the density has not already been corrected to base conditions, you enter the temperature and pressure at which the density was measured.

Second enter the base temperature and pressure conditions. The “standard” or “base” condition is a defined combination of temperature and pressure at which liquid volumes are expressed for purposes of custody transfer, stock accounting, etc. The terms standard and base are used interchangeably. Accepted standard temperatures are 60°F, 15°C and 20°C. Accepted standard pressures are zero gauge pressure (for non-volatile liquids at the standard temperature) or the liquid's vapour pressure at the standard temperature (for volatile liquids).

You can use the buttons on the bottom of the tab control for predefined values.

Third enter the alternate temperature and pressure conditions. The “alternate” conditions are any other temperature and pressure conditions to which the observed or standard density can be corrected. The input of a volume is optional, but if you have already entered a observed volume, you must not enter an alternate volume.

The results are shown in the green boxes: CTL (Correction factor for the effect of Temperature on the Liquid), CPL (Correction factor for the effect of Pressure on the Liquid), CTPL (Correction factor for the effects of Temperature and Pressure on the Liquid, Volume Correction Factor VCF), Fp (Compressibility coefficient), base and alternate density and, if you have entered a observed or alternate volume, the base and alternate volumes.

**ASTM D1250-04 Tables**

This software provides procedures for generating correction factors in tabular format that can be printed for convenience. The format of these tables is that of the historical Petroleum Measurement Tables.

Previous versions of this Standard had separate tables for the temperature and pressure corrections. These can still be created as specific cases of the general procedure. The equivalent of 1980 temperature correction tables can be generated by setting the pressure to the base value (one atmosphere). The equivalent of the pressure correction tables can be generated by printing the compressibility factor at the base pressure.

**ASTM D1250-04 Regression**

This software calculates the density at 60°F and the thermal expansion factor at 60°F from measured density values. It accepts measured density values and derives values of the density at 60°F and the thermal expansion factor at 60°F.The following are general guidelines for the data analysis:

• A minimum of 10 data points is needed to use this method.

• The data measurements should cover the temperature range over which the VCF values are to be used. The range should span 60°F even if a measurement is not made at this temperature.

• The density measurements should be made at such pressures that a pressure correction need not be applied (i.e., the CPL factor is 1 for all of the data points).

For more information go to the download page.