Limitations of IF97

The IF97 method, as used in AVEVA Process Simulation, is valid between temperatures of 0°C and 800°C for pressures between 0.000611 and 100 MPa (the section labeled "1" in the following graph). This method is also valid between temperatures of 800°C and 2000°C for pressures between 0.000611 and 50 MPa (the section labeled "2" in the following graph).

Note: The following graph is a simplified version of Fig. 1 in the IF97 document referenced earlier. It has been simplified in order to demonstrate the two ranges of pressure and temperature appropriate for this method.

AVEVA Process Simulation uses the implementation of IF97 officially approved by the International Association for the Properties of Water and Steam (IAPWS). Refer to the tables in the Reference document for detailed information on accuracy and uncertainty at specified temperatures and pressures.