Final answer:
Materials used in the piping of liquefied petroleum gas must be chemically resistant due to the demanding storage and transportation conditions, such as the extremely low temperatures required for liquefied natural gas.
Step-by-step explanation:
The materials used in the construction of piping systems for liquefied petroleum gas (LPG) or other chemical constituents of gases must exhibit a high level of chemical resistance. This is crucial because the liquefaction of gases is a key process in not only storage but also transportation, such as in the form of liquefied natural gas (LNG) and LPG. These substances are often transported and stored in conditions that could degrade materials that are not adequately resistant. For instance, LNG typically consists of methane and requires storage at very low temperatures, around -162°C, in double-walled, vacuum-insulated containers. Materials like certain metals, alloys, or rubber supports are often selected for their durability and resistance to such stresses and chemical exposures.