NFPA NFPA 13 Sprinkler Systems 2 — Questions and Answers
Question 1: What color code indicates a sprinkler with a temperature rating of 135–170°F (57–77°C) under NFPA 13?
- Uncolored/Black (Correct answer)
- White
- Blue
- Red
Correct answer: Uncolored/Black
NFPA 13 specifies that sprinklers rated at 135–170°F are uncolored (natural brass) or marked with a black color code.
Question 2: Under NFPA 13, a deluge system differs from a preaction system in that a deluge system has:
- Closed sprinkler heads throughout
- Open sprinkler heads throughout (Correct answer)
- Air-pressurized piping
- A single detection zone
Correct answer: Open sprinkler heads throughout
A deluge system uses open (non-fusible) sprinkler heads so that water discharges from all heads simultaneously when the deluge valve opens.
Question 3: According to NFPA 13, what is the required minimum pipe size for a single sprinkler branch line?
- ½ inch
- ¾ inch (Correct answer)
- 1 inch
- 1¼ inch
Correct answer: ¾ inch
NFPA 13 requires a minimum pipe size of ¾ inch for branch lines serving individual sprinklers.
Question 4: Which NFPA 13 system type uses a pneumatic or electric detection system to open the valve before a sprinkler fuses?
- Wet pipe
- Dry pipe
- Preaction (Correct answer)
- Deluge
Correct answer: Preaction
A preaction system requires operation of a supplemental detection system to open the preaction valve before water can flow to sprinklers.
Question 5: Under NFPA 13, what hazard classification applies to auto showrooms, bakeries, and laundries?
- Light hazard
- Ordinary hazard Group 1 (Correct answer)
- Ordinary hazard Group 2
- Extra hazard Group 1
Correct answer: Ordinary hazard Group 1
NFPA 13 classifies auto showrooms, bakeries, and laundries as Ordinary Hazard Group 1 occupancies.
Question 6: According to NFPA 13, what is the maximum area of sprinkler operation (design area) for a light hazard hydraulically designed system?
- 1,000 sq ft
- 1,500 sq ft (Correct answer)
- 2,000 sq ft
- 3,000 sq ft
Correct answer: 1,500 sq ft
NFPA 13 sets the design area for a hydraulically designed light hazard sprinkler system at 1,500 square feet.
NFPA NFPA 13 Sprinkler Systems 2
What color code indicates a sprinkler with a temperature rating of 135–170°F (57–77°C) under NFPA 13?