Ways to detect freezing in a hydrant include:
a. Open the hydrant fully and listen for water.
b. Lowering a weight on a stout string into the hydrant. It may strike ice or come up wet, showing water in the barrel.
c. Pressure the hydrant with gas.
d. Strike the hydrant with a hammer and listen for the ringing sound.
e. Feel the temperature of the metal.
Answer: B