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Building the pressure slowly at the fire department connection to 150 psi is crucial for several reasons. Automatic sprinkler systems are designed to operate within specific pressure ranges to ensure effective water distribution and performance. Setting the pressure to 150 psi allows for adequate and efficient water flow without exceeding the system's operational limits or risking damage to the components.

Starting at a lower pressure and gradually increasing it helps to avoid shock to the system, which could lead to leaks or mechanical failure. A sudden spike in pressure can stress the system and joints, potentially leading to catastrophic failures during an emergency.

This pressure level is established based on industry standards and practices that prioritize the safety and functionality of both the sprinkler system and the firefighters who may be dependent on it. It ensures that the system is supplied adequately to fight the fire effectively while maintaining the integrity of the system itself.