Question: A compressed air system consists of a compressor and receiver, 1500 ft (458 m) of 4-in. (1lO.2-cm) pipe, two gate valves, six standard elbows, and a manifold. Four rock drills requiring 200 cu ft/min (5.7 m3/min) each are connected to the manifold by 11/4--in.(3.2-cm) hoses 100 ft (30.5 m) long. Pressure drop in the manifold is 3 psig (20 kPa) and line leakage is 5%. Determine the pressure at the drill when all four drills are operating simultaneously and receiver pressure is 100 psig (690 kPa) of tool air consumption from Table. What is the minimum rated size of air compressor required if the project is located at an altitude of 6000 ft (1830 m).
