Answer :

Final Answer:

The alarm must activate for the standpipe when it is over d. 125psi and under.

Explanation:

The standpipe alarm activates to alert users when the pressure within the system exceeds or falls below certain thresholds. In this scenario, the standpipe alarm should activate when the pressure surpasses 125psi (pounds per square inch). This ensures that the pressure remains within safe operating limits, preventing potential damage to the system and ensuring its efficient functioning.

Pressure in standpipes is critical for maintaining adequate water flow in emergency situations, such as fires. By setting the alarm threshold at 125psi, it allows for a margin of safety while ensuring that pressure remains sufficiently high for effective firefighting. This decision is based on industry standards and regulations that prioritize safety and performance in emergency response systems.

Calculating the activation threshold involves considering the operational requirements and safety margins of the standpipe system. It ensures that the alarm activates at a pressure level that provides optimal performance without compromising safety. Thus, setting the threshold at 125psi strikes a balance between operational efficiency and safety, enhancing the reliability of the standpipe system in emergency situations. d. 125psi and under.

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