What is the minimum pressure that pressure tanks should be maintained at?

The minimum pressure that pressure tanks should be maintained at is vital for ensuring the proper functioning of sprinkler systems. A pressure of 75 PSI is generally regarded as a standard baseline for many sprinkler applications. This pressure allows for adequate water flow and coverage, ensuring that systems can effectively suppress fires when activated.

Maintaining the pressure at this level ensures that the system can provide sufficient water at the desired flow rates during an event where activation is needed. If the tank pressure were set too low, it could compromise the system's performance, leading to inadequate water flow and a higher risk of failure in a fire emergency.

Higher pressures, such as those listed in some of the other options, might not be necessary for all applications and could even lead to unnecessary strain on system components. Understanding how different pressures affect system performance can also help in designing systems that balance efficiency and safety, which is crucial for fire protection systems.