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### Critical Pressure and Temperature Cavett Correlation Calculation

Critical Pressure and Temperature Cavett Correlation for Oil Formula and Calculator

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Critical Pressure Cavett Relation Formula
Eq. 1

Pc = 10(2.829) + ( 0.0009112 · Tb ) - ( 0.0000030175 · Tb2 ) + (0.0000000015141 · Tb3) - ( 0.000020876 · Tb · API ) + (0.000000011048 · Tb2 · API ) + ( 0.0000000001395 · Tb)2 · API

Critical Temperature Cavett Method Formula
Eq. 2

Tc = 768.071 + ( 1.7134 · Tb ) - ( 0.0010834 · Tb2 ) + (0,0000003889 · Tb3) - ( 0,00089213 · Tb · API ) + (0,00000053095 · Tb2 · API ) + ( 0,000000032712 · Tb2 · API2 )

Where:

Tb = Boiling Point Temperature (°F)
API = API Gravity of oil (API)
Pc = Critical Pressure (Psi)
Tc = Critical Temperature (°F)

Crude oil is classified as light, medium, or heavy according to its measured API gravity.

Light crude oil has an API gravity higher than 31.1° (i.e., less than 870 kg/m3)
Medium oil has an API gravity between 22.3 and 31.1° (i.e., 870 to 920 kg/m3)
Heavy crude oil has an API gravity below 22.3° (i.e., 920 to 1000 kg/m3)
Extra heavy oil has an API gravity below 10.0° (i.e., greater than 1000 kg/m3

Source:

Wikipedia

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