Compressed Air Best Practices - May 2008 - (Page 19) Compressed Air Industry AUTOMOTIVE ASSEMBLY | 05/08 | mode due to the lack of severity. Leakage failures can result in excessive noise either at the point of the leak, or quite often from the air compressor operating at a higher than normal cycle rate to maintain air system pressure. Not only is the noise pollution an issue for the driver and passengers, but more importantly, the wasted energy results in increased operating costs for the bus owner through more frequent maintenance and downtime from excessive operation. It should be noted that leakage failures that continue for an extended period of time can often escalate to more severe life cycle failures. The three most common causes of kneeling module failures — whether life cycle or leakage — are Temperature, Contamination and Vibration. The following section details these three major causes of failure, along with summary highlights from a series of tests conducted to simulate these real-world applications with side-by-side comparison of multiple modules. Failures Caused by Temperature The most critical kneeling module performance requirement for bus OEMs and end-users (e.g., fleet owners) alike is to function properly in a wide range of temperatures. Both high and low temperatures cause failures. High temperatures can induce life cycle failures by causing seals to soften and wear too quickly. Solenoids failures can also occur due to overheating if the module sees temperatures in excess of 100 °C. Low temperatures, however, are by far the most common cause of both leakage and life cycle failures and, therefore, a more critical element around which to design a module. Kneeling systems must be able to meet the industry standard requirement of performance at -40 °F (-40 °C). When temperatures reach extreme negative degrees, seals will begin to harden and stick causing a “no shift” failure mode to occur. When seals harden they are also more susceptible to becoming cut as the valve operates, www.airbestpractices.com 19 http://www.parker.com http://www.airbestpractices.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 Compressed Air Best Practices - May 2008 - Compressed Air Best Practices - May 2008 (Page Cover1) Compressed Air Best Practices - May 2008 - Compressed Air Best Practices - May 2008 (Page Cover2) Compressed Air Best Practices - May 2008 - Compressed Air Best Practices - May 2008 (Page 3) Compressed Air Best Practices - May 2008 - Contents (Page 4) Compressed Air Best Practices - May 2008 - Contents (Page 5) Compressed Air Best Practices - May 2008 - From the Editor (Page 6) Compressed Air Best Practices - May 2008 - From the Editor (Page 7) Compressed Air Best Practices - May 2008 - Utility-Air News (Page 8) Compressed Air Best Practices - May 2008 - Utility-Air News (Page 9) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 10) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 11) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 12) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 13) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 14) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 15) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 16) Compressed Air Best Practices - May 2008 - The Compressed Air Audit of the Month (Page 17) Compressed Air Best Practices - May 2008 - Pneumatics (Page 18) Compressed Air Best Practices - May 2008 - Pneumatics (Page 19) Compressed Air Best Practices - May 2008 - Pneumatics (Page 20) Compressed Air Best Practices - May 2008 - Pneumatics (Page 21) Compressed Air Best Practices - May 2008 - Pneumatics (Page 22) Compressed Air Best Practices - May 2008 - Pneumatics (Page 23) Compressed Air Best Practices - May 2008 - Pneumatics (Page 24) Compressed Air Best Practices - May 2008 - Pneumatics (Page 25) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 26) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 27) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 28) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 29) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 30) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 31) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 32) Compressed Air Best Practices - May 2008 - Real World Best Practices (Page 33) Compressed Air Best Practices - May 2008 - Delta Industries: Doing What is Right for Customers (Page 34) Compressed Air Best Practices - May 2008 - Delta Industries: Doing What is Right for Customers (Page 35) Compressed Air Best Practices - May 2008 - Delta Industries: Doing What is Right for Customers (Page 36) Compressed Air Best Practices - May 2008 - Delta Industries: Doing What is Right for Customers (Page 37) Compressed Air Best Practices - May 2008 - Delta Industries: Six Truths You Need to Know about Really Putting the Customer First (Page 38) Compressed Air Best Practices - May 2008 - Delta Industries: Six Truths You Need to Know about Really Putting the Customer First (Page 39) Compressed Air Best Practices - May 2008 - Delta Industries: Six Truths You Need to Know about Really Putting the Customer First (Page 40) Compressed Air Best Practices - May 2008 - Delta Industries: Six Truths You Need to Know about Really Putting the Customer First (Page 41) Compressed Air Best Practices - May 2008 - Power Supply Industries (Page 42) Compressed Air Best Practices - May 2008 - Power Supply Industries (Page 43) Compressed Air Best Practices - May 2008 - Power Supply Industries (Page 44) Compressed Air Best Practices - May 2008 - Resources for Energy Engineers (Page 45) Compressed Air Best Practices - May 2008 - Resources for Energy Engineers (Page 46) Compressed Air Best Practices - May 2008 - Wall Street Watch (Page 47) Compressed Air Best Practices - May 2008 - Wall Street Watch (Page 48) Compressed Air Best Practices - May 2008 - Advertiser Index (Page 49) Compressed Air Best Practices - May 2008 - Job Market (Page 50) Compressed Air Best Practices - May 2008 - Job Market (Page Cover3) Compressed Air Best Practices - May 2008 - Job Market (Page Cover4)
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