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1) A 3-inch nominal size cast iron pipe has an actual inside diameter of 3.58 inches. The pipe is 5000 feet long and carries 30 gpm of lubricating oil between two level points, A and B. The oil has a specific gravity of 0.90 and the friction coefficient f = .035. If the pressure at A is 50 psig, calculate the pressure at B.
2. Water at 80°F flows from a storage tank through 550 feet of 6-inch Schedule 40 pipe. Taking the energy loss due to friction into account, calculate the required elevation head, h, in the storage tank and above the pipe inlet to produce a volume flow rate of 2.50 ft3/sec. Consider f = .020.
3. A water main is a concrete pressure pipe 18 inches in diameter. Calculate the pressure drop over a 1-mile length due to pipe wall friction if the pipe carries 15.0 ft3/sec of water at 50°F and f = .027.
4 On a farm, water is delivered from a pressurized storage tank at 60°F to an animal watering trough through 300 feet of 1-1/2 inch Schedule 40 steel pipe. The overall rise in the pipe from tank to trough is 3 feet. Calculate the required air pressure above the water in the tank to produce 7.5 gal/min of flow (use f = .025).
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