Abstract: The invention features methods and apparatuses for determining replacement of components in liquid pressurization systems. A replaceable component for use in a pump of a liquid pressurization system includes a body portion and a data storage mechanism. The data storage mechanism is in physical contact with the body portion. The data storage mechanism is configured to communicate information to a reader of the liquid pressurization system. The information is usable to determine a condition of replacement (e.g., a remaining usable life) of the replaceable component.

Abstract: A torch height control system maintains a substantially constant operating parameter of the arc during processing of a workpiece by measuring the operating parameter, comparing the operating parameter to a reference value to generate a deviation, adjusting a standoff between the torch and the workpiece by moving the torch relative to the workpiece at a rate which increases with an increase in the deviation to minimize the deviation, and clamping the rate of torch movement relative to the workpiece when the deviation exceeds a predetermined value.