What is a disadvantage of using threads to join pipes and fittings?

The choice of reduced effective wall thickness is a recognized disadvantage of using threaded joints for pipes and fittings. When threads are cut into a pipe or fitting, the process removes material from the walls, which can lead to a thinner section of the pipe where it is threaded. This reduction in wall thickness can compromise the structural integrity and pressure-handling capability of the piping system.

Less material can mean the pipe is more susceptible to failure due to pressure, temperature changes, or mechanical stress. Additionally, this thinning may increase the risk of leaks at the threaded connections, which is particularly important in applications where the integrity of the system is critical.

While other options might also present concerns in certain circumstances, the reduction of effective wall thickness is a direct physical change resulting from creating threads, making it a clear disadvantage of this type of joining method.