C197 – ASTM-IP Table 5:1952

Description

This calculates the API gravity at 60°F from an observed API gravity and corresponding temperature.

References

Report on the Development, Construction, Calculation and Preparation of the ASTM-IP Petroleum Measurement Tables – ASTM D 1250; IP 200 (1960)

ASTM-IP Petroleum Measurement Tables – ASTM D 1250; IP 200 (1952)

Kelton calculation reference C197

FLOCALC calculation reference F083

Options

Precision

  • Full
  • Rounding

This option is used to choose whether to apply rounding to the same number of significant figures as the printed values in Petroleum Measurement Table 5 or output values with full precision.

Hydrometer correction

  • Apply

This option is chosen to apply the hydrometer correction described below.

Calculation

Hydrometer Correction

The hydrometer correction is calculated by:

Where
ΔT = Difference in temperature compared to base temperature in °F

API Gravity at 60°F

The API gravity at 60°F is calculated by an iterative process based around the relationship:

Where
ΔT = Difference in temperature compared to base temperature in °F
APIT = API gravity at observed temperature
a1 = Constant from Table III
a2 = Constant from Table III
b1 = Constant from Table III
b2 = Constant from Table III

 

 

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