What type of protection is required for piping installed in concealed locations near the edges of supporting members?

The requirement for shield plates is based on the need to protect piping from potential damage when installed in concealed locations near the edges of supporting members. This is particularly important because the edges of beams, joists, and other structural elements can create sharp corners or points where the piping could become compromised due to impacts or wear over time.

Using shield plates ensures that any mechanical systems running through these areas are adequately covered and protected from both physical damage and potential crushing that could occur if weight were applied directly to the piping. Additionally, the use of shield plates is often mandated in mechanical codes to enhance the durability and safety of the installation, ensuring that the piping remains functional and does not pose a risk of leaks or failures.

In contrast, heat shields are designed to protect against high temperatures, flexible joints allow for movement but do not provide necessary protection from edges, and brackets are used for support but do not safeguard the piping itself. Thus, shield plates are the appropriate choice for this specific application in concealed locations.