Shopping center trading with sprinklers isolated and hydrant pressure low
A three-storey shopping center of 18,000 m² has had its sprinkler control valve closed for three weeks because of a leaking test valve. The fire pump is set to manual after a pressure switch fault. On the top floor, a hydrant test shows 2.5 bar at the most remote outlet; the design requires 4.0 bar. The food court has two ABC powder extinguishers and one CO2 extinguisher for a deep-fat fryer; several extinguishers show a 2019 inspection tag. The center is open, with about 2,300 people on Saturday. The facility manager proposes to keep trading and compensate by adding six 6 kg powder extinguishers and instructing staff to call the fire brigade early. You are the fire safety consultant.
1. Evaluate whether the proposed compensation is acceptable.
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No. Portable extinguishers cannot compensate for a disabled sprinkler system, a fire pump in manual or inadequate hydrant pressure. The sprinkler valve has been closed for three weeks, so the building's main automatic protection is unavailable; a fire in a shopping center with 2,300 people can grow beyond staff capability before the fire service arrives. The pump must be in automatic and the pressure switch repaired. The 2.5 bar remote hydrant reading against a 4.0 bar design is a water-supply deficiency, not a minor maintenance item. The food court extinguisher set is also wrong: ABC powder or CO2 is not the primary choice for a deep-fat fryer; a Class F wet chemical extinguisher is needed. The 2019 tags indicate missed inspections. Adding six powder extinguishers may create confusion and does not fix water supply.
2. What immediate risk controls should be put in place until repairs are complete?
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Implement a formal impairment procedure, notify the fire authority and insurer, and provide a trained fire watch with rounds every 30 minutes in the affected areas, including service corridors and the food court. Prohibit hot work and smoking, reduce combustible storage and check exit routes. Put the fire pump back in automatic only after the pressure switch is safe; if that cannot be done, provide a temporary fire watch and alternative water supply. Replace the fryer extinguisher with a wet chemical unit and service all extinguishers. Brief staff on early calling and evacuation; keep the fire service access route clear. Consider limiting occupancy in the most affected areas, but do not treat extinguishers as equivalence.
3. Set out the repair and return-to-service sequence with documentation.
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Priority: repair the pump pressure switch and restore automatic operation; repair the leaking test valve and reopen the sprinkler control valve, then verify pressure and alarm; investigate the hydrant pressure deficiency (pump curve, closed valve, pipe corrosion) and restore 4.0 bar at the remote outlet; correct extinguisher classes and inspection tags; close the impairment permit with test results. Document daily fire-watch logs, notifications, repair invoices and a return-to-service test. Only then remove the fire watch. If repairs take longer, keep the fire watch and restrictions in place; reopening the valve without fixing the leak will just repeat the shutdown.