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All potable water openings and outlets shall be protected against backflow in accordance with the following:
1. Openings and outlets shall be protected by an air gap between the opening and the fixture flood level rim as specified in Table 18-29-608.15.1. Openings and outlets equipped for hose connection shall be protected by means other than an air gap.
2. Openings and outlets shall be protected by a reduced pressure principle backflow preventer.
3. Openings and outlets shall be protected by a backflow preventer with an intermediate atmospheric vent.
4. Openings and outlets shall be protected by atmospheric-type vacuum breakers. The critical level of the vacuum breaker shall be set a minimum of 6 inches (150 mm) above the flood level rim of the fixture or device. Ball cocks shall be set in accordance with Section 425.3.1. Vacuum breakers shall not be installed under exhaust hoods or similar locations that will contain toxic fumes or vapors. Pipe-applied vacuum breakers shall be installed not less than 6 inches (150 mm) above the flood level rim of the fixture, receptor or device served.
5. All pull-out spout-type faucets shall be in compliance with CSA CAN/CSA B125 and have an integral vacuum breaker or vent to atmosphere in their design or shall require a dedicated deck- or wall-mounted vacuum breaker. Approved deck-mounted or equipment-mounted vacuum breakers and faucets with integral atmospheric or spill-proof vacuum breakers shall be installed in accordance with the manufacturer's instructions and the requirements for labeling with the critical level not less than, 1 inch (25 mm) above the flood level rim.
6. Sillcocks, hose bibbs, wall hydrants and other openings with a hose connection shall be protected by an atomospheric-type or pressure type vacuum breaker or a permanently attached hose connection vacuum breaker.
Exceptions:
1. This section shall not apply to water heater and boiler drain valves that are provided with hose connection threads and that are intended for only tank or vessel draining.
2. This section shall not apply to water supply valves intended for connection of clothes washing machines where backflow prevention is otherwise provided or is integral with the machine.
Fixture | Minimum Air Gap | |
Away from a wall a (inches) | Close to a wall (inches) | |
Lavatories and other fixtures with effective opening not greater than 1/2 inch in diameter | 1 | 1 1/2 |
Sink, laundry trays, gooseneck back faucets and other fixtures with effective openings not greater than 3/4 inch in diameter | 1 1/2 | 2 1/2 |
Over-rim bath fillers and other fixtures with effective openings not greater than 1 inch in diameter | 2 | 3 |
Drinking water fountains, single orifice not greater than 7/16 inch in diameter or multiple orifices with a total area of 0.150 square inch (area of circle 7/16 inch in diameter). | 1 | 1 1/2 |
Effective openings greater than 1 inch. | Two times the diameter of the effective opening. | Three times the diameter of the effective opening. |
For SI: 1 inch = 25.4 mm.
a. Applicable where walls or obstructions are spaced from the nearest inside edge of the spout opening a distance greater than three times the diameter of the effective opening for a single wall, or a distance greater than four times the diameter of the effective opening for two intersecting walls.
Connections to the potable water system shall conform to Sections 18-29-608.16.1 through 18-29-608.16.6.
Every water supply pipe servicing a beverage carbonator shall receive its supply through a receiving tank constructed in accordance with Section 18-29-606.5.4 of this Article or shall have installed in the pipe an approved stainless steel in-line-pressure-type backflow preventer consisting of two check valves separated by an open air port conforming to ASSE 1012 or ASSE 1022. The air port shall not be directly connected to the drainage system.
The backflow preventer shall be installed in an accessible location on the discharge side of the carbonator water supply valve. No copper tube or pipe or copper lined components shall be used for the receiving tank or its piping to the carbonator or the outlet of the stainless backflow preventer.
Steam boilers exceeding a pressure of 15 psi (103.4 kPa) and hydronic heating systems designed to exceed a pressure of 15 psi (103.4 kPa) or a temperature of 250°F (121°C) shall not be directly connected to the water supply system. Steam boilers not exceeding a pressure of 15 psi (103.4 kPa) and hydronic heating systems designed not to exceed pressure of 30 psi (306.9 kPa) or a temperature of 250°F (121°C) shall be provided with an in-line pressure-type backflow preventer consisting of two check valves separated by an open air port. The air port shall not be directly connected to the drainage system. The backflow preventer shall be installed in an accessible location on the discharge side of the boiler water supply valve and on the inlet side of the boiler feed valve.
All fire protection equipment, tanks, risers, standpipes, domestic house tanks, compression tanks and all other tanks that have a weight check valve for backflow prevention and are supplied with water from the Chicago Waterworks System shall be drained and flushed at least every 12 months. Further, fire protection systems and equipment shall be kept free from accumulations of sand, silt, and stagnant water which would nullify the action of the chlorine content of City water.
(Amend Coun. J. 10-14-21, p. 37722, Art. VI, § 28)
Any building, premises, material or storage yard which receives service from the Chicago Waterworks System shall not have a siamese or other connection for fire extinguishing purposes installed near any river, lake, or waterway where a city fire boat or city fire engine or pump may pump river, lake or shore water into the city water pipes through a cross-connection of any kind.
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