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 |