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What is the minimum acceptable flow at the base of the riser for a pipe-schedule sprinkler system in an ordinary hazard (Group 1) occupancy?
For a pipe-schedule sprinkler system, the minimum water flow at the base of the riser depends on the occupancy hazard classification, as defined in NFPA 13.
For Ordinary Hazard (Group 1) occupancies, the minimum required flow at the base of the riser is 500 gpm (1,893 L/min).
The 500 gpm flow ensures sufficient water supply to the sprinkler system to suppress fires involving moderate combustibles.
Higher flows (e.g., 700 gpm and 850 gpm) are required for more severe hazards (e.g., Extra Hazard occupancies).
NFPA 13, Table 11.2.3.1.1: Minimum flow requirements for pipe-schedule systems.
After conducting the annual test of a dry barrel hydrant, what is the maximum length of time permitted for full drainage to take place?
Dry barrel hydrants must be tested annually to ensure proper drainage and operation. According to NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems:
After testing, full drainage of the hydrant must occur within 15 minutes. This ensures no residual water remains in the hydrant barrel, which could freeze in cold climates and damage the hydrant.
If the hydrant fails to drain within 15 minutes, it indicates an obstruction or malfunction in the drainage system that must be corrected.
10 minutes (A): Not enough time for standard drainage.
30 minutes (C) and 60 minutes (D): Exceed the acceptable limit defined by NFPA 25.
NFPA 25, Section 7.3.2: Annual testing and drainage requirements for dry barrel hydrants.
Which of the following requires an emergency plan?
Comprehensive and Detailed Step-by-Step Explanation:
Emergency Plan Requirements:
According to NFPA 101 (Life Safety Code), Section 12.4.1, special occupancies like special amusement buildings are required to have an emergency plan due to their unique fire hazards, including lighting effects, confined pathways, and high fire risk.
Why Special Amusement Buildings Need a Plan:
These structures often have complex layouts and unique hazards, increasing the need for a clear and practiced emergency plan.
Other Options Explained:
Option A (Parking garage): Typically does not require an emergency plan unless additional hazards exist.
Option B (Grocery store): Emergency plans are usually required for larger assembly or high-risk occupancies.
Option C (Two-story office building): Generally does not require an emergency plan unless it exceeds occupancy thresholds.
Summary:
A special amusement building requires an emergency plan due to its unique fire and egress hazards.
The following types of systems are addressed within the scope of NFPA 25, Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems EXCEPT
Comprehensive and Detailed Step-by-Step Explanation:
Scope of NFPA 25:
NFPA 25 specifically covers the inspection, testing, and maintenance of water-based fire protection systems.
These include:
Sprinkler systems
Standpipe and hose systems
Foam-water systems
Water spray systems
Option C (Wet Chemical):
Wet chemical systems are not water-based; they fall under NFPA 17A (Standard for Wet Chemical Extinguishing Systems).
Wet chemical systems are typically used in kitchen fire suppression systems where they extinguish fires involving grease or oil.
Other Options Explained:
Option A (Sprinklers): Addressed by NFPA 25.
Option B (Standpipe and hose): Addressed by NFPA 25.
Option D (Foam water): Foam-water systems use water to mix and distribute foam and are within NFPA 25's scope.
Summary:
Wet chemical systems are not covered by NFPA 25, as it only applies to water-based fire protection systems.
What is the maximum area allowed for draft stops provided between a suspended ceiling and the floor above?
Comprehensive and Detailed Step-by-Step Explanation:
Draft Stops and Fire Protection:
Draft stops are installed to limit the spread of smoke and heat in concealed spaces, such as the area between a suspended ceiling and the floor above.
According to NFPA 13 (Standard for the Installation of Sprinkler Systems), Section 8.15.1.2.4, the maximum area for draft stops is 1,000 ft (93 m).
Purpose of Limiting Area:
Limiting the area to 1,000 ft ensures smoke and fire are contained within smaller sections, slowing the spread and improving fire control by sprinklers.
Other Options Explained:
Option A (500 ft): Too small; not the maximum allowed under NFPA 13.
Option C (1,500 ft) and Option D (3,000 ft): Exceed the allowable area for draft stops.
Summary:
The maximum area allowed for draft stops provided between a suspended ceiling and the floor above is 1,000 ft (93 m) per NFPA 13.
