Answer :
Final answer:
The appropriate pressure for using a pressure reducing assembly depends on system specifications and typical safe operating pressures. 60 psi is a common setting for residential water systems. The correct answer would require more context about the system in question. The Correct option is b. 60 psi
Explanation:
The question regarding at what pressure a pressure reducing assembly should be used does not directly correspond to any of the reference information provided. However, based on a general understanding of pressure systems and the reference that these expressions can be used with little error at any pressure that is not much greater than pº, say up to at least 2 bar (which is approximately 29 psi), one could surmise that a pressure reducing valve is necessary when pressures exceed a certain threshold that is typical for a system's safe operation.
Selection of a specific pressure set point, such as 30 psi, 60 psi, 100 psi, or 75 psi, would depend on the specifications of the system it's being used with. For instance, residential water systems often use pressure reducing valves set around 50 to 60 psi to protect plumbing fixtures and reduce the risk of leaks, meaning option b. 60 psi might be a common setting for such applications. Without specific context for the question or the details of the system in question, it would be impossible to determine the correct pressure setting without further information.
