§ 15-325 TESTING OF BACK FLOW DEVICES.

   Testing and repair of backflow devices will be done by licensed plumbers, trained as tester/repair technicians. Maintenance workers, who are certified as test/repair technicians can service backflow preventers in their place of employment.

(Ord. 1051, passed 9-5-1989)

Table 1
Cross-Connections Where Protective Devices are Required And Critical Level (C-L) Settings for Vacuum Breakers
Fixture or Equipment	Method of Installation
Aspirators and ejectors	C-L at least six inches above flood level of receptacle served
Dental units	On models without built-in vacuum breakers, C-L at least six inches above flood level rim of bowl
Commercial dishwashing machines	C-L at least six inches above flood level of machines; install on both hot and cold water supply lines
Garbage can cleaning machines	C-L at least six inches above flood level of machine; install on both hot and cold water supply lines
Hose outlets	C-L at least six inches above highest point on hose line
Commercial laundry machines	C-L at least six inches above flood machines level of machine; install on both hot and cold water supply lines
Lawnsprinklers	C-L at least 12 inches above highest sprinkler or discharge outlet
Tanks and vats	C-L at least six inches above flood level rim or line
Through urinals	C-L at least 30 inches above perforated flush pipe
Flush tanks	Equip with approved ball cock, installed according to manufacturer’s instructions
Hose bibs (where aspirators or ejectors could be connected)	C-L at least six inches above flood level of receptacle served
Critical level (C-L) is defined as the level to which the vacuum breaker may be submerged before backflow will occur; where the C-L is not shown on the preventer, the bottom of the device shall be taken as the C-L

 

(Ord. 1051, passed 9-5-1989)

 

Table 2
Partial List of Cross-Connections Which May be Subject To Back Pressure
Chemical lines	Pumps
Dock water outlets	Steam lines
Individual water supplies	Swimming pools
Industrial process water lines	Tanks and vats- -bottom inlets
Pressure tanks	Hose bibbs

 

(Ord. 1051, passed 9-5-1989)