Transcription of BACKFLOW PREVENTION - SPRINKLER TALK
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BACKFLOW PREVENTION - SPRINKLER TALK
Cross-Connection Control HandbookBACKFLOW 7/9/07 1:58 PM Page 1 Man has long recognized theneed for pure drinking water,but only in the last 50 or 60years has there been any realeffort to prevent contaminationcaused by double check valvescame into use around the turnof the century to isolate firemains and industrial water linesfrom the potable water supply,little interest was shown in theindividual treatment of plumb-ing 1929 the major breakthroughcame when a device consistingof two check valves with arelief valve between them wassuccessfully tested in Danville.
“All of this is very interesting, but does it REALLY happen?” you may ask. The answer to that is an emphatic YES! Below are listed some typical cases of
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