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Difficulty: MediumDrawing Logical Conclusions

In unheated warehouses subject to freezing temperatures, dry-pipe fire sprinkler systems are installed instead of standard wet-pipe systems. Rather than holding water directly in the overhead pipes, these systems maintain pressurized nitrogen or air upstream of a dry-pipe valve to keep the clapper closed against city water pressure. When a sprinkler head activates due to heat, the air pressure drops, allowing the valve to open and water to flood the piping network. Because pressurized air exhausts more slowly through a small sprinkler orifice than pressurized water discharges, delivery of water to the fire involves an inherent delay.

Based on the passage, which of the following conclusions is most logically supported?

  1. A
    Pressurized nitrogen keeps the clapper valve closed permanently throughout an active fire.
  2. A fire in a facility protected by a dry-pipe system will experience a longer interval before water reaches the flames than in a wet-pipe system.Answer
  3. C
    Freezing ambient temperatures prevent dry-pipe valves from opening unless supplemental building heaters are installed.
  4. D
    Wet-pipe sprinkler systems cannot be used in any commercial facility where heat-activated heads are required.

Answer

A fire in a facility protected by a dry-pipe system will experience a longer interval before water reaches the flames than in a wet-pipe system.
The conclusion that dry-pipe systems involve a longer interval before water reaches the flames is strictly supported by combining the fact that wet-pipe systems hold water directly in overhead pipes while dry-pipe systems require pressurized gas to vent first, causing an inherent delay in water delivery.

Step-by-Step Solution

1
Identify the comparative mechanics described in the passage
Standard wet-pipe systems hold water directly in the overhead piping, whereas dry-pipe systems hold pressurized air that must exhaust before water can fill the empty pipes.
Establishing the operational baseline of both systems is necessary to evaluate differences in response time.
2
Analyze the causal outcome of the dry-pipe discharge sequence
Because venting air through a small sprinkler orifice takes time, the passage notes an 'inherent delay' in water reaching the fire.
Connecting the air exhaustion mechanism to the time factor identifies the core logical implication.
3
Deduce the logical comparative conclusion
Since wet-pipe systems have water already at the sprinkler head and dry-pipe systems must first vent pressurized gas, the dry-pipe system takes longer to deliver water to the fire.
The conclusion directly synthesizes the stated operating constraints without adding unsupported assumptions.

Key Concept

Drawing a logical deduction by synthesizing comparative operational constraints from a factual text.
Estimated Time:1m 5s
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Drawing Logical Conclusions

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