AFE March/April 2012 : Page 17

THE IMPACT OF IMPENDING STANDARDS ON BUILDING WATER TREATMENT PRACTICES Th e CTI standard outlines specifi c environmental, operational and design practices that contribute to the control of Legionella pneumophila bacteria in the cooling water systems covered by it. First, a detailed description of the organism is presented; including where and how it grows. Th is is followed by a three step method of control of the organism with the goal being a “non-detectable level” of Legionella bacteria in the cooling water at all times: 1. Feeding biocides to the cooling water to keep total planktonic bac-teria below 10,000 CFU (10 4 Colony Forming Units) per ml. 2. Regularly testing the water for both to-tal planktonic and Legionella bacteria. 3. Specifying required control actions when these tests exceed the limits, fol-lowed by retesting to verify results. Validation of a successful microbiologi-cal control program is required. Th ere are two methods outlined in CTI 159. In both methods, the only acceptable result is non-detectable levels of Legionella bacteria. In practical terms this means if you have any type of cooling tower, you must test it for Legionella bacteria. “Th is test must be performed by an accredited microbiology laboratory certifi ed for Legionella testing in the CDC Environmental Laboratory Iso-lation and Technique Evaluation (ELITE) certifi cation program. Th e only acceptable result is ‘none detected.’ If any positive result is obtained, system disinfection must be performed.” 2 All professionals involved with the treat-ment of water in commercial and institution-al buildings will be impacted by the changing social, environmental and legal aspects of the new standards. Th ese standards will help increase the safety and health of all humans working with or contacting water on a regu-lar basis. By education and staying ahead of these measures, misconceptions and incor-rect actions can be avoided; thereby enabling proper and effi cient compliance. FEJ Jerry Angelilli is manager of oxidative technology/senior engineer at Chem-Aqua. Pat Guccione is vice president of business development at Chem-Aqua. Resources 1. Proposed New Standard 188, Prevention of Legionel-losis Associated with Building Water Systems. American Society of Heating, Refrigeration and Air-conditioning Engineers, Inc. 1791 Tullie Circle, NE, Atlanta, GA 30329-2305 (Public Review Draft ) 2. CTI STD-159 Legionellosis Related Practices for Evapora-tive Cooling Water Systems. Cooling Technology Institute, ** 2611 FM 1960 West, Suite A-101, Houston, TX 77068-3730 (Task Group Draft : CTI STD-159) December 2011 Both fi gures are directly from the Second Public Re-view Draft (June 2011) of Proposed New Standard 188, Prevention of Legionellosis Associated with Building Water Systems (American Society of Heating, Refrig-eration and Air-conditioning Engineers, Inc.), pages 20 and 21. VFD-Induced Bearing Currents Kill Motors! Split uKIT Universal Mounting Kit Protect your bearings and motors! SGR BEARING PROTECTION RING Proven in hundreds of thousands of installations, the AEGIS ® SGR protects motor bearings from damaging VFD-induced currents and extends motor life. It also dramatically reduces downtime and improves the reliability of motor-driven equipment and systems. U Safely channels harmful currents away from bearings to ground U Maintenance-free, easy to install, lasts for life of motor U New Split uKIT simplifies and speeds installation on any motor—without detaching coupled equipment See how easy it is to install the AEGIS ® Split uKIT! To download a free technical paper on bearing protection technologies, visit our website: 1-866-738-1857 | sales @ est-aegis.com www.est-aegis.com March | April 2012 Q  Facilities Engineering Journal Q  www.AFE.org 17

Electro Static Technology
Using a screen reader? Click Here