The role of pressure is not taken into account when using composite curves on a temperature/enthalpy flow rate (T/I) diagram to predict minimum utility requirement in a chemical process. Usually, pressure effects are neglected by assuming small pressure drops through the process. However, sometimes, the energy analysis should be applied to a part of the process involving large pressure changes, e.g. an expander coupled directly to a compressor. In such a case, enthalpy changes indicate neither the quality nor the energy flow direction between the streams exchanging energy. The problem of high pressure exchangers in pinch technology is now solved by a combination of exergy analysis in a temperature vs power availability (T/P-x) diagram in addition to the usual approach in the pinch technology.