Requirements for Chlorine (Cl₂) Disinfection and Sulfur Dioxide (SO₂) Dechlorination Systems Using 150 pound (lb) Cylinders

1. (a) Heated Rooms.

   1. (1) A Chlorine (Cl₂) and Sulfur Dioxide (SO₂) system that uses 150-pound (lb) cylinders must be located indoors at a minimum temperature of 65 degrees Fahrenheit. This provision applies to all chemical feed equipment, including the cylinders, chlorinators, and/or sulfonators.
   2. (2) An unconnected cylinder may be stored outdoors, but the cylinder must reach at least 65 degrees Fahrenheit before being connected to a system.

2. (b) Heating Blankets.

   1. (1) Heating blankets on Cl₂ gas cylinders are prohibited.

   2. (2) An SO₂ cylinder may have a heating blanket only in a temperature-controlled room to increase the temperature inside a cylinder above the ambient room temperature.

      1. (A) The report must include a calculation determining the setting for a heating blanket to maintain a cylinder temperature of less than 100 degrees Fahrenheit.
      2. (B) A heating blanket must include a mechanism that ensures that a blanket does not heat a cylinder above 100 degrees Fahrenheit.
      3. (C) A cylinder with a heating blanket that is connected to a disinfection system must have a downstream pressure-reducing valve.
      4. (D) An SO₂ system must be capable of deactivating a heating blanket if high pressure is detected downstream.
3. (c) Separation. The design of a disinfection system using 150-lb cylinders must ensure that Cl₂ and SO₂ are not in the same room and will never come into contact with each other.

Source Note:The provisions of this §217.275 adopted to be effective August 28, 2008, 33 TexReg 6843.