Chlorine (Cl₂) Disinfection and Sulfur Dioxide (SO₂) Dechlorination System Redundancy Requirements

1. (a) Each Cl₂ disinfection and SO₂ and dechlorination system must include at least two banks of chemical storage cylinders.
2. (b) A bank of cylinders must include a device that automatically switches from an empty bank of cylinders to a full bank of cylinders in a manner that ensures continuous disinfection.
3. (c) A facility must have sufficient space to store a bank of empty cylinders.
4. (d) A chemical delivery system must be designed so that the pound per day requirements in §217.272 of this title (relating to Capacity and Sizing of Chlorine (Cl₂) Disinfection and Sulfur Dioxide (SO₂) Dechlorination) are met with the largest chlorinator, sulfonator, or evaporator out of service.
5. (e) A chemical delivery system must include a backup pump for any injector water supply system requiring a booster pump.
6. (f) A chemical delivery system must include an emergency power source capable of maintaining operation of the chlorination and dechlorination of the minimum flow necessary to keep the facility from being inundated by influent during an extended power outage.

Source Note:The provisions of this §217.271 adopted to be effective August 28, 2008, 33 TexReg 6843.