High-Rise Fire Pumps

In a high-rise building, the fire pump isn’t just another piece of mechanical equipment. It’s the single most critical life safety device in the entire structure.

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Municipal water pressure typically delivers 40–60 PSI at street level. That’s adequate for the first few floors. But by the time water needs to reach the 15th, 25th, or 40th floor, city pressure alone can’t push it there. The fire pump bridges that gap.

If the fire pump fails during a fire, the upper floors have no suppression capability. The consequences are catastrophic.

Understanding NFPA 25 Testing Requirements

Weekly No-Flow (Churn) Test: The pump is started and run under no-flow conditions for a minimum of 10 minutes. This verifies the pump starts automatically and operates without unusual noise or vibration.

Monthly Inspections: Visual inspection of the pump room, including checking for leaks, verifying pressures, inspecting the controller, and confirming pump room temperature is above 40°F.

Annual Full-Flow Test: The pump is run at multiple flow points — shutoff, 100% rated capacity, and 150% rated capacity — while pressures are compared against the original acceptance test curve. This reveals degradation that weekly churn tests cannot detect.

Signs of Pump Degradation

• Unusual vibration during operation — indicates bearing wear, impeller damage, or misalignment.
• Pressure drops at rated flow — the earliest and most reliable indicator of internal wear.
• Controller trouble signals — any persistent signal requires immediate investigation.
• Visible leaks at packing glands — a stream is not normal.
• Longer start-up times — the motor or driver may be degrading.

The Sessi Standard

At Sessi Fire Protection, fire pump testing isn’t a checkbox exercise. Every test generates a detailed digital report with pressure curves, photographic documentation, and clear deficiency identification.

We don’t just tell you your pump passed or failed. We show you exactly where your system stands relative to code.

Is your annual fire pump flow test due? Use the chatbot below to instantly book one of our certified technicians.