Exam Study Guide: Chlorine Withdraw Rate

Exam Study Guide: Chlorine Withdraw Rate

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When faced with a licensing exam, don't struggle with test anxiety! Use the question below and others from our Exam Study Guide series to study and prepare for exam questions. Take a look at this sample water treatment licensing question along with an explanation of the correct answer.

Sample question:

How can an operator avoid exceeding the maximum gas chlorine withdraw rate of a 1-ton cylinder?

A) By hooking up to the bottom valve and feeding liquid chlorine to an evaporator and turning it back into a gas
B) By opening the cylinder valve all the way open
C) By loosening the packing nut on the cylinder
D) By packing ice around the chlorine feed lines to keep them cool

Answer: The maximum withdraw rate for a 1-ton chlorine cylinder when feeding gas chlorine is roughly 400 pounds per day. If this is exceeded, the operator could experience ice formation on chlorine feed lines. This can be avoided by connecting to the bottom valve and feeding liquid chlorine to an evaporator, which heats the liquid chlorine converting it into a gas.

So, the correct answer is A.

Reference: Handbook Of Chlorination And Alternative Disinfectants. 4th Edition, John Wiley & Sons, Inc. Page 791

About the author
Drew Hoelscher is the program director of drinking water operations at the Environmental Resources Training Center (ERTC) in Edwardsville, Illinois.



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