603.2 Revise Table 603.2 as follows:

603.2 Revise Table 603.2 as follows:

Add a footnote for the Applicable Standards heading that states:

All backflow prevention assemblies or devices that are testable must have passed laboratory and field evaluation tests performed by a recognized testing organization.

Revise the tenth entry in the Table to read as follows:

Backflow preventer for Carbonated Beverage Dispensers (two independent check valves with a vent to the atmosphere)

603.5.6.4 Add the following section:

ASSE X -- X -1022

Installation includes carbonated beverage machines or dispensers. These devices operate under intermittent or continuous pressure conditions. This device is only permitted in systems with no upstream copper pipe. Otherwise, a reduced pressure principle backflow prevention assembly is required.

603.5.6.4 Approval. All such installations shall be approved in writing by the San Francisco Water Department prior to installation.

603.5.12 Revise section as follows:

603.5.12 Beverage Dispensers. Potable water supply to beverage dispensers, carbonated beverage dispensers, or coffee machines shall be protected by an air gap, a reduced pressure principle backflow prevention assembly, or a vented backflow preventer that complies with ASSE 1022, except that a vented backflow preventer may not be used to protect carbonated beverage dispensers in systems with upstream copper pipe. For carbonated beverage dispensers, piping material installed downstream of the backflow preventer shall not be affected by carbon dioxide gas.

603.5.22 Add the following section:

603.5.22 Industrial Water Chillers. Potable water connections to closed-loop industrial water chillers shall be protected from backflow by a reduced pressure principle backflow prevention assembly in accordance with Table 603.2.