Applications of the COSTALD method

The COSTALD method is valid for aromatics and light hydrocarbons up to reduced temperatures of 0.95. The data banks contain the COSTALD characteristic volume V* for many components. However, if the characteristic volume for a pure component is not available, the software uses the critical volume of the pure component, Vc. If the characteristic volume for a petroleum or assay pseudocomponent is not available, the software back-calculates a characteristic volume to provide a correct specific gravity for the pseudocomponent.