2.4 2.5 2.6 2.7 (2.8 2.9 of the tank? pressure available at the base If a tank of identical height as the tank in Exercise 2.2 is constructed with a diameter of 75 feet (23 m), how does this affect the pressure at ground level? If a high-rise building is 108 feet (33 m) tall, how much pressure must be available at ground level to overcome elevation and deliver the 100 psi (6.9 bar) standpipe water pressure requirement at the roof? If the standpipe in Exercise 2.5 is attached to a city water main and filled with water, what pressure will exist at the roof level if the pressure at ground level is 127 psi (9 bar)? A 500,000 barrel crude oil storage tank is 46 feet (14 m) high. If the tank is full and the oil has a specific gravity of 0.89, what pressure will exist at the base of the tank? A tank containing 200,000 gallons (750 m³) of regular gasoline is 32 feet (10 m) high. If the tank is full, what pressure in psi (bar) will exist at the base of the tank? In the hydraulic system shown in Figure 2.15, what force (F) must be applied to attain a state of equilibrium if the circular surface upon which F, acts has a diameter of 6 inches (15 cm), the circular surface acted upon by F₂ has a diameter of 18 inches (46 cm), and F, is 85 pounds (39 kg)? Figure 2.15 Illustration for Exercise 2.9- 2.10 2.11 In a dry-pipe sprinkler valve, the air seat typically has a surface area on which the air pressure acts six times as large as the water seat upon which the water pressure acts. If the water pressure is 105 psi (7.2 bar). what air pressure is required to attain a state of equilibrium? In a multiple-story building, a water column has formed on the top side of a dry-pipe sprinkler valve having a 6:1 air seat to water seat ratio. If the column of water is 42 feet (12.8 m) high, and the city water pressure is 60 psi (4.1 bar), will the dry valve be able to open when the air pressure is evacuated from the system?