Cylinder Requirements for Chlorine (Cl₂) Disinfection and Sulfur Dioxide (SO₂) Dechlorination Systems

1. (a) Cylinder Withdrawal Rates.

   1. (1) Gas Withdrawal. The gas withdrawal rate per cylinder must be based on the Equation K.2. located in the following figure and the variables from Table K.2. located in the following figure:
      Attached Graphic
      

      1. (A) If the cylinders are not stored in a temperature-controlled enclosure, the report must include the ambient temperature based on the lowest seven-day average of the average daily local temperatures over the last ten years, as measured at the nearest National Oceanic and Atmospheric Administration's National Weather Service weather station.
      2. (B) Heating blankets on Chlorine (Cl₂) gas cylinders are prohibited.

   2. (2) Liquid Withdrawal. If liquid withdrawal from one-ton cylinders is proposed, the following are the maximum withdrawal rates:

      1. (A) 9,600 pounds (lbs)/day of Cl₂; and
      2. (B) 7,200 lbs/day of Sulfur Dioxide (SO₂).
2. (b) Cylinders per Bank. The number of cylinders per cylinder bank must be based on the equation in the following figure:
   Attached Graphic
   

Source Note:The provisions of this §217.273 adopted to be effective August 28, 2008, 33 TexReg 6843.