Final answer:
The question addresses a scenario in engineering concerning the visual inspection of hanging and bracing for piping systems. Without full context, one can infer that visual inspections might not be required for concealed piping in inaccessible areas or within finished walls, but the specific circumstances depend on relevant guidelines or codes of practice.
Step-by-step explanation:
The question implies a situation specific to an engineering context, particularly when dealing with piping systems and the requirements for their inspection. Usually, visual inspection is vital for ensuring the safety and proper installation of piping systems, including the hanging and bracing components. However, when piping is concealed in certain locations or conditions, it may not be necessary to conduct visual inspections. The full context required to accurately complete the sentence with respect to the specifics of when visual inspection is not required is missing here, which suggests that this may be an incomplete question taken from a larger set of guidelines or code of practice. Normally, certain types of concealed piping, such as those located in areas that are inaccessible or within finished walls, may not require visual inspections unless there is cause for concern or specific regulations apply.