What type of container is used to store LP gas?

The storage of LP gas is specifically designed to ensure safety and maintain the integrity of the gas under pressure. A cylinder or tank is the appropriate choice for storing LP gas, as these containers are built to withstand high pressure and are often equipped with safety features. They are typically made from materials that can contain gas safely without leaking, and they are engineered to handle the specific characteristics of liquefied petroleum gas.

Cylinders can be portable and used for smaller applications like outdoor grilling, while larger tanks are used for home heating or other commercial applications. The choice of cylinder or tank allows for proper storage and handling, ensuring that the gas remains stable and does not pose a risk of explosion or leakage.

The other options fail to meet the necessary safety and operational standards required for LP gas. A pipeline is used for transport rather than storage and is not suitable for containing LP gas in a stationary manner. A canister, while it may suggest a container, does not imply the structural capabilities necessary for the pressures involved with LP gas. A plastic bag is wholly inadequate, as it cannot handle the pressure nor can it contain the gas safely, as LP gas would quickly escape, posing serious safety hazards. Thus, the cylinder or tank is indeed the proper and safe