When is it permissible to use Bushings to reduce piping size?

Bushings are used in piping systems to connect different sizes of pipes or to reduce pipe size. However, the application of bushings must be aligned with certain codes and standards to ensure safety and functionality.

The correct answer indicates that it is never permissible to use bushings for reducing piping size. This is primarily because bushings can introduce potential weak points in a system, which could lead to leaks or failures, especially in high-pressure systems where integrity is crucial.

In practice, using fittings that are explicitly designed for reducing pipe size, such as reducers or proper connectors, is generally mandatory. These fittings provide a more secure and reliable transition from one pipe diameter to another, maintaining the strength and integrity of the system.

Therefore, while there are applications where bushings may be suitable for connecting different pipe sizes, they are not the preferred option for reducing the size of piping due to safety and operational concerns.