GA Fire Sprinkler flashcards
GA Fire Sprinkler · Build recall with a focused review session.
34 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Light hazard density
- Design density of 0.10 gpm/ft² over 1,500 ft² for light hazard occupancies such as offices, churches, and schools, per NFPA 13 density/area curves.
- Ordinary hazard Group 2
- Occupancy with moderate combustibility (e.g., mercantile, parking garages); design density 0.20 gpm/ft² over 1,500 ft² per NFPA 13.
- Wet-pipe system
- Automatic sprinkler system with water under pressure in piping at all times; fastest acting and most common system type.
- Dry-pipe system
- System with air pressure in piping; water enters after sprinkler operation releases air; requires dry-pipe valve, air compressor, and accelerator for large systems.
- Preaction system
- Dry system with detection; single-interlock releases water on detection only; double-interlock requires both detection and sprinkler operation; non-interlock releases on either.
- Deluge system
- System with open sprinklers/nozzles; all discharge simultaneously upon detection activation; used for high-hazard or special protection.
- Maximum sprinkler coverage
- Light hazard 225 ft², ordinary hazard 130 ft², extra hazard 100 ft² per sprinkler for standard spray upright/pendent sprinklers per NFPA 13 Table 8.6.2.2.1(a).
- Maximum sprinkler spacing
- Light and ordinary hazard 15 ft, extra hazard 12 ft between sprinklers on branch lines for standard spray sprinklers per NFPA 13.
- Minimum sprinkler spacing
- 6 ft between sprinklers on the same branch line to avoid cold soldering, unless baffles or calculations permit closer spacing per NFPA 13 8.6.2.2.1.
- Deflector distance
- Standard spray sprinklers: 1-12 in. below ceiling; residential: 1-4 in.; extended coverage per listing; ensures proper spray pattern per NFPA 13.
- Obstruction rule
- Sprinklers must be within 12 in. horizontally of obstructions ≤4 ft wide; greater than 4 ft wide requires sprinklers under or split per NFPA 13 Figure 8.6.5.1.1.
- Hazen-Williams formula
- Pressure loss: p = 4.52 Q^1.85 / (C^1.85 d^4.87) in psi/ft; C=120 for black steel, 100 for galvanized; Q in gpm, d in inches.
- Hose allowance
- Additional flow added to sprinkler demand for hose streams; typically 250 gpm for light hazard, 250-500 gpm for ordinary/extra hazard per NFPA 13.
- NFPA 13D duration
- One- and two-family dwellings and manufactured homes; design for 10-minute water supply duration; at least one sprinkler per compartment; no attic sprinklers generally.
- NFPA 13R scope
- Residential occupancies up to four stories above grade (apartments, condos); design for 30-minute duration; sprinklers in all habitable areas, closets, and some attics.
- 13R design density
- 0.05 gpm/ft² over entire floor area or 0.10 gpm/ft² over most remote two sprinklers, whichever is greater, per NFPA 13R.
- Residential sprinkler pressure
- Listed residential sprinklers (NFPA 13R/13D) have minimum design pressure of 7 psi and larger coverage up to 20 ft x 20 ft for 13D.
- 13R omission closets
- NFPA 13R permits omitting sprinklers in small closets (<24 ft²), bathrooms (<55 ft²), and certain attics/crawlspaces if noncombustible or limited combustible.
- Main drain test
- Annual test recording static and residual pressure; a drop of >10% from baseline indicates a supply problem or partially closed valve per NFPA 25.
- Dry-pipe valve trip test
- Annual test; record time to trip and time for water to reach test valve; should be within 60 seconds for dry pipe per NFPA 25.
- Sprinkler replacement interval
- Quick-response sprinklers at 20 years, then 10-year intervals; standard response at 50 years, then 10-year intervals per NFPA 25 Table 5.4.1.1.1.
- Fire pump annual flow test
- Test at 0%, 100%, 150% of rated flow; compare to baseline; churn pressure should not exceed 140% of rated per NFPA 25.
- Impairment procedures
- Tag system, notify fire department and occupants, provide fire watch if system out of service >4 hours per NFPA 25 Chapter 15.
- Water flow test extrapolation
- Plot static, residual, and flow on semi-log paper; extrapolate to 0 psi to estimate available flow using N^1.85 graph or formula.
- Fire pump churn pressure
- Maximum pressure at zero flow; must not exceed 140% of rated pressure per NFPA 20 to avoid overpressurizing system components.
- Standpipe Class I
- 2½-in. outlets for fire department use; 100 psi at top; required in buildings with high-rise or large area per NFPA 14.
- Standpipe Class II
- 1½-in. outlets for occupant use; 100 psi at top; typically in buildings where fire department access is limited.
- Standpipe Class III
- Both 2½-in. and 1½-in. outlets; provides fire department and occupant use; 100 psi at top per NFPA 14.
- Georgia sprinkler contractor license
- Issued by Georgia Fire Marshal's Office under O.C.G.A. Title 25-12; requires company license and at least one certified technician; biennial renewal.
- Georgia technician qualifications
- Minimum 2 years documented experience, pass NICET Level II or state exam, background check, fingerprinting, and 8 hours annual continuing education.
- Georgia plan review
- Submit shop drawings, hydraulic calculations, and product data to local AHJ for approval before installation; permit required before work begins.
- Hydrostatic test
- Test at 200 psi for 2 hours (or 50 psi above working pressure) per NFPA 13; required before concealment and final inspection.
- Fall protection threshold
- Required when working at heights >6 ft per OSHA 1926.501; use ladders, scaffolds, or lifts properly; inspect before use.
- Lockout/tagout
- Procedures required when servicing equipment with hazardous energy; follow OSHA 1910.147 to prevent unexpected startup or release of energy.