Up Time Magazine- June/July 2008

we from the crowd. Figure 2 - Baghouse access plate near hopper. It is in good condition, but multiple leaks are possible in the door hatch, door gasket and weld seams. be close to the source of the leak. On the other hand, vacuum leaks of high powered air ducts may be heard at great distances. Again, when you have air rushing through a duct at such high speeds, the vacuum (inleakage) can be very great and the “ultrasonic signal” may be easily detected. Airborne ultrasound is typically capable of hearing a 1x10-3 std.cc/sec, but there are instruments out there that can detect as low as 1x10-4 std.cc/sec. Utilizing one of the long range accessories (long range horn, a parabolic reflector), air ducts hung high in the overhead, may also be scanned from great distances. Baghouses come in many sizes and shapes and many configurations, all dependent upon a particular application. For instance, a pipe foundry or steel mill may have a baghouse utilizing airflow for general ventilation of 1,115,000 cfm and a 75,000 cfm baghouse. While another facility, say a fiber board manufacturer, may have a baghouse collector of only 18,000 cfm’s. Nonetheless, both require periodic maintenance in order to run efficiently. During just one vacuum leak survey, one major paper manufacturing plant using a large dust collector system found as many as 37 leaks around access plates, flanges, weld seams, bolted flange mounts of the valves mounted on the hopper and a rotary valve system mounted on the duct work. A manufacturing plant technician wrote me after reading a recent Ultrasonic War Story about this application. He found, and immediately repaired, several leaks after scanning his plant’s dust collector ducting. He later said that had he not made the repairs the baghouse system would have required maintenance much sooner to remove and replace the bags in the system. A major thunder storm dumped several inches of water in the area shortly after the repairs had been made, so they were very timely. I was recently told of a similar situation, about how technicians in a major steel mill performed a vacuum leak survey of three pulverized coal-handling units in their coke plant, and the duct work for two large ID fans at a gas cleaner. In a coke plant, pulverized coal is heated and moved through the system on its way to the coke ovens by a vacuum created by a large ID fan. As a result, the dry pulverized coal has an increased explosion potential. Oxygen levels are lowered by introducing nitrogen into the system. As with other coke operations, a very corrosive atmosphere is present and it is often hard to maintain the low-oxygen Avoid lubricant cross contamination and misapplication with our Spectrum Visual Lubrication Management System. The Spectrum System ensures the correct lubricant is used in the right piece of equipment, and in the proper location. VISUAL LUBRICATION MANAGEMENT MADE EASY! Spectrum Products Available: • Grease Identiﬁcation System • Grease Meter • EZI-action® Drum Pumps • Oil Safe® Containers • Opto-Matic® Color Collars • Spectrum wall charts • Color-coded labels and tagging system • Bulk oil storage system FOR SIMPLE AND EFFECTIVE LUBRICATION MANAGEMENT, CALL TRICO. Figure 3 - Baghouse access plate in poor condition, so the potential for leaks is greater. www.uptimemagazine.com www.tricocorp.com 800-558-7008 http://www.tricocorp.com http://www.uptimemagazine.com

Table of Contents Feed for the Digital Edition of Up Time Magazine- June/July 2008

Up Time Magazine- June/July 2008 Contents Upfront Upclose: The True Cause of Most Machine Failures Information Technology: Finding Future Perfect Lubrication: Building an Oil Analysis Winner Maintenance Management: Hidden Ways to Increase Safety Infrared: Air Barriers Lower Energy Costs, Increase Profits Motor Testing: Efficient Motor Repair, Part Deux Precision Maintenance: Good Maintenance, Smart Maintenance Reliability: Common Errors in Root Cause Analysis Ultrasound: Avoid the Baghouse Blues Vibration: Don't Let Your Sensors Get Eaten Alive Upgrade: Lining It All Up

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