Just received a suprise inspection from state / FDA inspectors. One of the minor findings was the lack of backflow prevention for the water lines used for hoses / cleaning. Anyone else seen this? We have backflow prevention on main line into the facility. I have never encountered this requirement.
If you have and corrected it, where did you source your very inexpensive in-line backflow preventers?
You are required by code to have either air gaps or backflow prevention on all potable lines in service between municipal connection and internal plumbing. Cross connections to waste/treatment are also a major issue for potable feed (e.g. chemical dosing on boiler or cooling tower treatment).
The main concern being momentary loss of positive (resulting in siphonage or suction) pressure which may in-turn, upon return of positive pressure, discharge water unsuitable for food back into the internal lines.
Both of which are relatively low cost and maintenance free.