NV Fire Sprinkler flashcards
NV Fire Sprinkler · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Hazen-Williams formula
- Friction loss per foot = 4.52 Q^1.85 / (C^1.85 × d^4.87), where Q is flow in gpm, d is internal pipe diameter in inches, and C is the roughness coefficient.
- Sprinkler K-factor
- The discharge coefficient relating flow to pressure: flow (gpm) = K × √P (psi). Common K-factors are 5.6, 8.0, 11.2, 14.0, and 25.2.
- Remote area reduction
- NFPA 13 permits reducing the remote area by 25% for dry systems, 30% for double-interlock preaction, and up to 40% for quick-response sprinklers in light hazard.
- Design density
- The minimum water flow rate per square foot (gpm/ft²) applied over the remote area, selected from NFPA 13 based on hazard classification and ceiling height.
- Light hazard spacing
- Maximum sprinkler spacing is 15 feet between sprinklers and 225 square feet per sprinkler for light hazard occupancies, per NFPA 13.
- Deflector clearance
- Minimum 1 inch below ceiling for standard spray sprinklers; 18 inches below noncombustible ceilings for extended coverage; 12 inches below combustible ceilings for ESFR.
- Sprinkler temperature ratings
- Ordinary: 135–170°F (orange/red); intermediate: 175–225°F (yellow/green); high: 250–300°F (blue); extra high: 325–375°F (purple); ultra high: 400–650°F (black).
- Main drain test
- A flow test at the riser to verify water supply and detect obstructions; compare static and residual pressures; a drop exceeding 10% from baseline indicates a problem.
- Fire pump churn pressure
- The pressure developed by a fire pump at zero flow; for centrifugal pumps, churn pressure must not exceed 140% of rated head.
- Standpipe Class I
- A standpipe system with 2-1/2-inch outlets intended for fire department use, requiring 100 psi residual pressure at the topmost outlet.
- Fire pump flow test
- Annual test at 100%, 150%, and churn flow; verify pump performance curve: at 150% flow, pressure must be at least 65% of rated head.
- Backflow preventer loss
- A reduced pressure zone (RPZ) backflow preventer typically causes a 5–10 psi pressure loss that must be included in hydraulic calculations.
- Weekly inspection tasks
- Inspect gauges for normal pressure, test alarm valves if not monitored, check diesel fuel level and battery condition, and verify valve positions.
- Sprinkler spare stock
- Minimum spare sprinklers: 6 for systems up to 300 sprinklers, 12 for 300–1000, and 24 for over 1000; include a sprinkler wrench.
- 5-year internal inspection
- NFPA 25 requires internal inspection of piping and sprinklers in dry systems every 5 years, and replacement of dry-pipe sprinklers every 10 years.
- Obstruction investigation
- Required when a main drain test shows a pressure drop exceeding 10% from baseline, or when sprinkler discharge is visibly reduced.
- Nevada C-41 license
- Nevada State Contractors Board classification for fire protection systems, with no monetary limit; requires 4 years experience, exams, and a $10,000 bond.
- Mechanic's lien deadline
- In Nevada, file a preliminary notice within 31 days of first furnishing labor or materials; record the lien within 90 days after completion.
- Continuing education requirement
- Nevada contractors must complete 16 hours of continuing education every two years for license renewal, including at least 4 hours on business practices.
- Nevada prompt payment
- Owner must pay contractor within 30 days of invoice; if not, contractor may stop work after providing 10-day written notice.
- Clark County sprinkler requirement
- Clark County requires fire sprinkler systems in all new commercial buildings and residential occupancies with more than two dwelling units, regardless of area.
- High-rise sprinkler threshold
- Nevada requires automatic sprinkler systems in high-rise buildings, defined as 75 feet or more in height, per state fire marshal amendments.
- Fire flow duration
- Nevada adopts IFC Appendix B: minimum fire flow for light hazard is 1,500 gpm for 2 hours; for ordinary hazard, 2,000 gpm for 2 hours.
- Plan review submission
- Submit fire sprinkler plans to the local fire authority having jurisdiction and building department; approval is required before installation begins.
- Fall protection threshold
- OSHA requires fall protection when working at heights of 6 feet or more; use guardrails, safety nets, or personal fall arrest systems.
- Hydrostatic test pressure
- New sprinkler systems must be hydrostatically tested at 200 psi for 2 hours, or 50 psi above maximum working pressure, whichever is greater.
- As-built drawings
- Final drawings reflecting actual installed conditions, including pipe sizes, sprinkler locations, and revisions; required for owner and AHJ records.
- Job hazard analysis
- A documented process to identify potential hazards for each task and define controls before work begins, required for safety compliance.
- NFPA 13R design density
- Residential sprinkler systems use lower design densities, such as 0.05 gpm/ft² over four sprinklers, with a 10-minute duration, and are limited to 4 stories.
- ESFR sprinkler criteria
- Early Suppression Fast Response sprinklers are for storage occupancies up to 45 feet ceiling height, with design density 0.35–0.7 gpm/ft² and 12 sprinklers flowing.
- Clean agent hold time
- NFPA 2001 requires a 10-minute hold time for clean agent systems in occupied spaces, verified by a room integrity test.
- Kitchen hood suppression
- NFPA 96 requires wet chemical suppression systems for commercial cooking hoods, with semi-annual inspection and cleaning, and automatic fuel shutoff.