SECTION 217.273. Cylinder Requirements for Gaseous Chlorine Disinfection and Sulfur Dioxide Dechlorination Systems

(a) Cylinder Withdrawal Rates for Chlorine and Sulfur Dioxide Gases.

(1) Gas Withdrawal. The gas withdrawal rate per cylinder for chlorine and sulfur dioxide cylinders must be based on Equation K.2. and the variables from Table K.2. in Figure: 30 TAC §217.273(a)(1).

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(A) If the chlorine or sulfur dioxide cylinders are not stored in a temperature-controlled enclosure, the engineering report must include the ambient temperature based on the lowest consecutive 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 with at least ten years of records.

(B) Heating blankets on chlorine gas cylinders are prohibited.

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

(A) 9,600 pounds per day (lbs/day) of chlorine; and

(B) 7,200 lbs/day of sulfur dioxide.

(b) Number of Cylinders Required. The number of cylinders required for normal operation at peak flow must be based on Equation K.3. in Figure: 30 TAC §217.273(b).

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Source Note: The provisions of this §217.273 adopted to be effective August 28, 2008, 33 TexReg 6843; amended to be effective December 4, 2015, 40 TexReg 8254