Correct Answer: C
Explanation/Reference:
Explanation:
In dry pipe systems, the water is not actually held in the pipes. The water is contained in a "holding tank" until it is released. The pipes hold pressurized air, which is reduced when a fire or smoke alarm is activated, allowing the water valve to be opened by the water pressure. Water is not allowed into the pipes that feed the sprinklers until an actual fire is detected. First, a heat or smoke sensor is activated; then, the water fills the pipes leading to the sprinkler heads, the fire alarm sounds, the electric power supply is disconnected, and finally water is allowed to flow from the sprinklers. These pipes are best used in colder climates because the pipes will not freeze.
Incorrect Answers:
A: A "dry pipe" sprinkler system is not a replacement for a carbon dioxide system. Dry pipe systems still use water which is not suitable for many fires. Therefore, this answer is incorrect.
B: A "dry pipe" sprinkler system does not maximize the chances of accidental discharge of water. The chances are reduced as there is no water held in the pipes. Therefore, this answer is incorrect.
D: A "dry pipe" sprinkler system uses no less water than "wet pipe" systems. Therefore, this answer is incorrect.
References:
Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, p. 474