https://geonika.agis.uniba.sk/tsenz/index.php?action=history&feed=atom&title=Back_siphonage 2026-04-06T10:13:49Z História úprav pre túto stránku na wiki MediaWiki 1.31.1 https://geonika.agis.uniba.sk/tsenz/index.php?title=Back_siphonage&diff=326&oldid=prev 2014-08-12T23:22:57Z

<p>Importing text file</p> <p><b>Nová stránka</b></p><div>:Slovak term: [[Slovenský termín]]<br /> # Back siphonage is the reverse flow of water within a water supply system due to negative pressures in the pipe system enabling atmospheric pressure to force the flow of water backwards through a siphon action (World Plumbing Council Working Group 2008).<br /> # The reversing of normal flow resulting from negative or subatmospheric pressures in the distribution piping of a drinking-water supply system (WHO 2006).<br /> <br /> ==Explanation==<br /> Back siphonage can occur as a result of excess demand such as fighting a fire where<br /> unusually large volumes are required and pressure is reduced (World Plumbing Council<br /> Working Group 2008).<br /> <br /> ==Example==<br /> Back Siphonage can be found if a water system is turned off, thus reducing the pressures to<br /> below atmosperic pressure and enabling the a negative or vacuum pressure to be formed<br /> drawing contaminated substances into the water system.<br /> <br /> The draw down or emptying of a hot water unvented pressure storage container will create<br /> vacuum, thus back siphonage will take place if a vacuum breaker valve is not installed<br /> (World Plumbing Council Working Group 2008)<br /> <br /> ==References==<br /> * WHO (2006) [http://www.who.int/water_sanitation_health/publications/plumbinghealthasp/en/index.html Health aspects of plumbing]<br /> * World Plumbing Council Working Group (2008)<br /> <br /> ==Links==<br /> * [http://apps.who.int/thelexicon/ WHO — The Health and Environment Lexicon]<br /> <br /> [[Category:EN]]</div>

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