MET230: Hydraulics and Pneumatics Unit 3 Review Assignment Problem 1 A compressor delivers 180 scfm of air through a 3/4-in schedule 40 pipe at a receiver pressure of 85 psig. Find the pressure loss for a 170-ft length of pipe Hint: Use the table shown if needed. Nominal Pipe Size (in) Inside Diameter d (in) 5.31 Nominal Pipe Size (in) Inside Diameter d (in) d5.31 0.493 0.0234 13 1.610 12.538 0.622 0.0804 2 2.067 47.256 0.824 0.3577 2 2.469 121.419 1.049 1.2892 3 3.068 384.771 1.380 5.5304 3 3.548 832.550 Tabulated values of d and d5.31 for schedule 40 common pipe Hint: Use the table shown if needed. Nominal Pipe Size (in) Inside Diameter d (in) 5.31 Nominal Pipe Size (in) Inside Diameter d (in) d5.31 0.493 0.0234 1 1.610 12.538 0.622 0.0804 2 2.067 47.256 0.824 0.3577 2 2.469 121.419 1.049 1.2892 3 3.068 384.771 1.380 5.5304 3 3.548 832.550 Tabulated values of d and d5.31 for schedule 40 common pipe Problem 2 A compressor delivers 2000 cfm of air through a pipe at a receiver pressure of 140 psig. What minimum size schedule 40 pipe should be used if the pressure loss is to be limited to 0.10 psi per foot of pipe length? Hint: use the table of Problem 1 if needed. Problem 5 How heavy an object can be lifted with a suction cup having a lip with a 8-in outside diameter and a 6.5- in inside diameter if the vacuum pressure is a. -5 psig b. A perfect vacuum Assume a factor of safety of 2.5 Problem 6 A pneumatic vacuum lift system has a total volume of 15 ft inside the cup and associated pipeline leading to the vacuum pump. The vacuum pump produces a flow rate of 3 scfm when turned on. The desired suction pressure is 5 psia and atmospheric pressure is 29.5 in Hg abs. Determine the time required to achieve the desired suction pressure. (Hint: 30 inHg = 14.7 psia)