Read the following technical passage and complete the statement based strictly on the text:
During routine maintenance of tactical water purification units, technicians inspect the multi-media pre-filter pressure gauges. When the differential pressure across the filter exceeds 15 pounds per square inch (psi), the operator must initiate a backwash cycle using treated water. Initiating this cycle clears trapped sediment from the silica sand bed and restores optimal water flow. Technicians must log the final operating pressure before returning the system to standard service.
Based on the passage, what differential pressure reading requires the operator to initiate a backwash cycle?
Answer:The operator must initiate a backwash cycle when the differential pressure across the filter exceeds 【15 pounds per square inch】.
Answer
15 pounds per square inch (15 psi)
The passage explicitly states that when the differential pressure across the filter exceeds 15 pounds per square inch (psi), the operator must initiate a backwash cycle.
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