The closed tank of a fire engine is partly filled with water, the air space above being under pressure. A 6 cm bore connected to the tank discharges on the roof of a building 2.5 m above the level of water in the tank. The friction losses are 38 cm of water. Determine the air pressure which must be maintained in the tank to deliver 35 litres/sec. on the roof. Roof 25m Closed tank Hose pipe (d-6 cm) Air Water

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