What does the term "pressure piping system" refer to?

The term "pressure piping system" specifically refers to a system designed for the conveyance of an expansible fluid, such as gas or steam, under pressure. This definition captures the essence of what a pressure piping system is intended to do—transport fluids that exist in a gaseous state, which can expand and occupy different volumes depending on temperature and pressure conditions.

Understanding this term is essential in the context of steamfitting, as these systems must be carefully designed and constructed to withstand the forces and pressures that come from carrying fluids under pressure. This includes not just the pipes themselves, but also the materials used in fittings, gaskets, and other components, which must be compatible and safe for use under such conditions. Therefore, the correct answer emphasizes the operational role of a pressure piping system in facilitating the movement of pressurized fluids, capturing its function beyond mere construction components.