What is the main advantage of using a flexible listed pipe coupling?

The main advantage of using a flexible listed pipe coupling is that it allows for rotation of at least one degree of angular movement without inducing harm. This feature is crucial in systems where thermal expansion or contraction occurs, as well as in areas where there may be minor misalignments in the pipes. The flexibility of the coupling can accommodate these movements without transferring stress to the connected pipes, which helps prevent damage such as cracking or breaking.

Utilizing a coupling that permits slight angular movement is essential for maintaining the integrity and longevity of the sprinkler system, as it allows for adjustments and can alleviate stress that would otherwise affect rigid joints. This capability is particularly beneficial in environments where vibrations or shifts may occur.

In contrast, the other options focus on aspects that are not the primary benefits of flexible listed pipe couplings. For instance, some may suggest that such couplings can facilitate tool-free installation, but this is not their main purpose; their primary function is to provide flexibility and adaptability in the piping system. Similarly, options that mention rigid connections or preventing movement altogether do not align with the design intent of flexible couplings, which inherently encourage movement to protect the overall system.