On many machines, including reciprocating compressors and expanders, we assess if and how performances can be safely changed. It can be driven by process changes, need to increase capacity, or desire to decrease power consumption. On pumps and turbo-machinery, we upgrade seals and optimise performances without risking surge. On gearboxes, we change ratios. Furthermore, we often implement changes defined by various OEM’s (change of rotors and diaphragms, upgrade of tachometers and trip systems, etc.)