Compressed Air Best Practices - May 2008 - (Page 23)

Compressed Air Industry AUTOMOTIVE ASSEMBLY | 05/08 | Test Results — All four kneeling modules functioned properly following the first 200-hour Salt Spray Test. Each unit showed some oxidation around the solenoid valves and steel pipe fittings; but there was no oxidation on aluminum parts or internal components (See Figure 7). Results of the second test showed that both solenoid and solenoid pilot operators were still operational after 500 hours of salt spray testing. The solenoid mounting screws were heavily oxidized at the completion of the soak test. See Figure 8 below. The Oil & Moisture Injection Test proved to be more demanding than the Salt Spray Tests. Two of the four kneeling modules functioned properly throughout the entire test, but the remaining two units stopped functioning after 14 hours of cycle time. At the end of the cycling, however, all four units functioned properly and did not leak. A cause for the two units failing to cycle the entire test could not be determined. Failures Caused by Vibration Vibration is the third major cause for leakage and lifecycle failures in kneeling modules. If not designed properly into a product, fasteners, springs, connectors, fittings and other components have the potential to vibrate loose, break or general component failure can result due to shock G vibration force. Testing Method — Four 4-station modules were mounted on a vertical axis. Four bolts were used to attach the module to a fixture; 120 in-lbs of torque was applied. A five (5) minute resonance sweep was performed to determine peak frequency (10-2500Hz at 2Gs) and then a durability test for 100,000 cycles was performed at that frequency. These procedures were then repeated for both horizontal and lateral axes. See Table 1 below. Vibration Test — (extracted from test report provided by Intertek) TABLE 1 – DURABILITY TEST FREQUENCY BLOCK VERTICAL AXIS HORIZONTAL AXIS LATERAL AXIS 2 3 4 6 242 Hz 250 Hz 229 Hz 293 Hz 246 Hz 275 Hz 260 Hz 301 Hz 387 Hz 424 Hz 200 Hz 427 Hz Shock Test: 22G, 11ms pulses 10 positive pulses and 10 negative pulses Random Vibration: 10 – 1000Hz 15 GRMS 1-hour duration 23 http://www.mikroporamerica.com/ http://www.mikroporamerica.com/

Table of Contents Feed for the Digital Edition of Compressed Air Best Practices - May 2008

Compressed Air Best Practices - May 2008 Contents From the Editor Utility-Air News The Compressed Air Audit of the Month Pneumatics Real World Best Practices Delta Industries: Doing What is Right for Customers Delta Industries: Six Truths You Need to Know about Really Putting the Customer First Power Supply Industries Resources for Energy Engineers Wall Street Watch Advertiser Index Job Market

Compressed Air Best Practices - May 2008

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.