§ 13.12.130. Connection not subject to backpressure

Where a water connection is not subject to back pressure, a vacuum breaker shall be installed on the discharge side of the last valve on the line serving the fixture or equipment. A list of some conditions requiring protective devices of this kind are given in Table 13.12.130 titled "Cross Connections where Protective Devices are Required."

Table 13.12.130

CROSS CONNECTIONS WHERE
PROTECTIVE DEVICES ARE
REQUIRED

Critical Level (C-L) Settings for
Vacuum Breakers

Fixtures 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 dish-washing machines	C-L at least six inches above flood level of machine. Installed on both hot and cold water supply lines.
Garbage can cleaning machines	C-L at least six inches above flood level of machine. Installed 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 level of machine. Installed on both hot and cold water supply lines.
Lawn sprinklers	C-L at least six inches above highest sprinkler head or discharge outlet.
Steam tables	C-L at least six inches above flood level rim.
Tanks and vats	C-L at least six inches above flood level rim or line.
Through urinals	C-L at least thirty (30) inches above perforated flush pipe.
Flush tanks	Equipment with approved ball cock, installed according to manufacturer's instructions.
Hose bibs	C-L at least six inches above flood level of receptacle served.

 

(Ord. 8909 § 4(a), 1989)