Final answer:
A pressure relief device must be installed in sections of piping and hose containing liquid LP-Gas between shutoff valves to relieve potentially dangerous pressure buildup.
Step-by-step explanation:
A pressure relief device shall be installed in each section of piping and hose in which liquid LP-Gas can be isolated between shutoff valves so as to relieve the pressure that could develop from the trapped liquid to a safe atmosphere or product retaining section. This is critical because LP-Gas expands when it is heated, leading to increased pressure in the container. For safe handling and transportation of LP-Gas, it is essential to install properly functioning pressure relief devices designed to activate when the pressure exceeds a preset level, thus preventing potential container rupture or explosion.
Understanding the behavior of gases and liquids under pressure is a key aspect of safely handling materials such as liquid LP-Gas. As liquid gas is exposed to heat, its pressure increases due to the expansion of the liquid's volume. This is analogous to how an increase in temperature causes a gas to expand in a sealed container, as shown in various experiments and models such as collecting gases over water and monitoring pressure in closed systems. If this increase is not mitigated by a pressure relief device, it could result in a hazardous situation.