Plant Services - April 2008 - (Page 24)

WHAT WORKS Fugitives found fleeing isibility is key to monitoring equipment, processes and plants, fixing problems and making needed adjustments to prevent downtime and mishaps. For many companies, finding leaks of volatile organic compounds (VOCs) and fugitive emissions is an old problem. Using traditional methods such as toxic vapor analyzers (TVA), or “sniffers,” requires an up-close survey of each and every component. It’s laborand time-consuming and doesn’t allow for maintaining safe distances during surveys. In a plant that has thousands of connections, valve packings, pressure-relief valves and other connections to be checked, finding leaks can be difficult, dangerous and costly. Diagnosis can be a problem. For example, an exchanger head leak might be caused by a fitting and not the seal. When the TVA probe gets near the seal, it might flame out, making it impossible to pinpoint the leak, which is the key to determining whether the seal must be replaced or if a simpler repair will suffice. Also, the cost of $600 to replace a seal affects a maintenance department’s budget. Facilities now diagnose leaks using infrared cameras filtered and tuned to show images of VOCs and greenhouse gases. Four leaks were found on an LPG compressor using a GasFindIR imager from FLIR Systems (www.flir. com). A traditional inspection method found a suspected leak and a yellow tag was placed in the approximate area on the compressor. Without the ability to pinpoint leaks, a complete flange connection repair would be made by 24 Infrared imaging pinpoints VOC and greenhouse gas emissions V Leakage from a ¼-in. tubing fitting on a pressure differential gauge appears as black smoke in the image. torquing the bolts and replacing the gasket – possibly spending more time and money than is required. With the GasFindIR, personnel can scan the compressor at a safe distance and see all four leaking flange connections. The camera also can be used as part of the maintenance process – a way to ensure that repairs are being done correctly. For example, when a component starts to leak, maintenance personnel often respond by over-tightening the connection. This sometimes causes a worse leak. Using the infrared camera to pinpoint a leak enables appropriate tightening to complete the repair. Also, by being able to pinpoint the leak, the repair can be completed in about one hour versus four hours. In addition to being able to find leaks and make the needed repairs, imagers can be used for quality assurance purposes. Unlike traditional leak-detection methods, an imager can verify a repair has been made correctly without the equipment being brought to full power. In the oil and gas, and petrochemical industries, it can take two or three days to take equipment www.PLANTSERVICES.com down for repair, restart and get back to full-power operations. If leaks are missed before or during the early startup stages – before getting to full operations pressure – the system can fail and have to be shut down again to make the repairs. Downtime is costly in terms of lost production, operators’ time and maintenance. An infrared imaging and measurement camera can detect and quantify thermal energy emitted from an object. The GasFindIR uses a special infrared imager that employs a sensitive detector and a cold filter to observe active leaks. It is capable of detecting volatile organic compounds and gas emissions including methane, sulfur hexafluoride, carbon monoxide and dozens of other gases. Imagers can find leaks at significant distances, depending on the size of the leak. Cameras with longer focallength lenses have been used from helicopters to spot leaks from barges, storage tanks and gas pipelines. An infrared imaging camera is able to survey several thousand points per hour. It can monitor gasoline refinery installations, natural gas pipelines, transfer stations, supertankers, moving railway tank cars and even landfills emitting methane gas and other chemicals into the environment. As industry strives to improve manufacturing efficiencies, manage energy, improve product quality, and enhance worker safety, new applications for infrared cameras continually emerge. Infrared imaging cameras have made it possible to see emissions not visible to the eye. April 2008 http://www.flir.com http://www.flir.com http://www.PLANTSERVICES.com

Table of Contents Feed for the Digital Edition of Plant Services - April 2008

Plant Services - April 2008 Contents From the Editor Letters The PS Files Up and Running Crisis Corner What Works Asset Manager Technology Toolbox Cover Story Compressors Motors Flooring Web Hunter In the Trenches Product Picks Classifieds Energy Expert

Plant Services - April 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.