6/5/2023 0 Comments Backflow fieldlines![]() One such cross connection was at a pesticide manufacturer. A water main break had caused a negative pressure in the distribution piping, siphoning water through unprotected cross connections. In another example, a pesticide used for termite control was found in a New Jersey municipal water supply. In this case, backflow prevention could have made the difference between life and death. ![]() The deaths of these two patients could have potentially been avoided had the proper backflow preventer, such as an RPZ type, was used on the cross connection between the drinking water system and the air conditioning system. From there, the glycol made its way into the dialysis machines, and eventually the patient’s blood. toilets flushing, faucets opening, etc.). With the valve partially open, the water-glycol mixture in the air conditioning system was allowed to backflow into the medical center’s water system when the pressure lowered due to normal usage (i.e. Glycol had entered the system through an air conditioning make-up water valve that was left open. With the risk of flooding, why install backflow preventers in the first place? Is the risk real? Should the possibility of contamination be taken seriously?Ĭonsider this legal case from the Midwestern United States: A coroner’s jury ruled that the accidental contamination of dialysis machines at a large medical center was a “significant condition” in the death of two patients. ![]()
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