Code Classroom
ASSE 1016 to limit hot water temperatures to safe tem- peratures. When using localized mixing valves is not feasible, you will need to include in your design the use of a physical or chemical secondary water treatment system. You can include one or more of the six ASHRAE allowable systems which are as follows: • Chlorine injection systems • Chloramines • Chlorine dioxide • Ozone • Copper-silver ionization units • UV irradiation These are the systems that ASHRAE recognizes as
having sufficient research to prove their effectiveness at controlling Legionellae bacteria. Engineers and design- ers should take the time to learn more about these sys- tems as each one comes with its advantages and disad- vantages, and each one of your designs may benefit from one type over another. Call your local hospitals and ask them what they are
doing to protect their patients from contracting Legionnaires Disease. If they aren’t doing anything, ask why not. Call your local newspapers and ask them to do a story on the topic to help increase awareness and edu- cation for your community. Legionnaires Disease is
®
preventable. Hospitals are being sued because of the infections they cause, even when their infection rates are within national norms but, for preventable infec- tions, the only acceptable rate is zero. Complacency is simply no longer acceptable. Plumbing engineers and designers play a greater role
in Legionnaires Disease prevention than do doctors, infection control professionals, HVAC engineers, water treatment specialists and microbiologists. The ASSE mission statement, “Prevention rather than cure,” dates back to the founding fathers of the organization in 1904. In an effort to prevent the unnecessary loss of life, engi- neers, designers, inspectors and contractors should all strive to design and install plumbing systems to prevent Legionellae bacteria growth, rather than dealing with trying to cure people who have contracted the disease. n
Ron George is president of Plumb-Tech Design &
Consulting Services, LLC. He has served as Chairman of the International Residential Plumbing & Mechanical Code Committee. To contact Ron, write him at rgdc@ron
georgedesign.com.
The views and opinions expressed in this column are those of the author and do not reflect those of Plumbing Engineer nor its publisher, TMB Publishing.
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Circle 13 on Reader Reply Form on page 65 Plumbing Engineer March 2011/Page 21 | 800.900.9276
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