Under NAC 624.572, which work is included in C-41a Automatic Fire Sprinklers?
Fire Sprinkler Systems
Question · Easy
In NFPA 13 (2007), which system keeps water out of the branch piping until a detection system operates, then fills the piping and discharges only from sprinklers that have opened?
NFPA 13 (2007) requires sprinkler-system control valves to be of which general type so their position can be determined without operating them?
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Per NFPA 13 (2007) Table 6.2.5.1, a sprinkler whose frame is painted white is in which temperature classification?
Unless a listing requires a higher value, what is the minimum residual pressure NFPA 13 (2007) allows at a standard spray sprinkler?
Unless a storage-specific chapter applies, what minimum clearance does NFPA 13 (2007) require from the sprinkler deflector down to the top of storage?
For standard spray upright or pendent sprinklers in Light Hazard under unobstructed construction, what maximum protection area and maximum spacing does NFPA 13 (2007) Table 8.6.2.2.1 allow?
Question · Medium
A Light Hazard office is sprinklered with standard spray pendent heads on 15 ft by 14 ft spacing. What protection area does each sprinkler cover, and what minimum flow is required at 0.10 gpm/ft²?
Using the NFPA 13 (2007) Figure 11.2.3.1.1 starting point, what density and remote area apply to Light Hazard?
An Ordinary Hazard Group 1 wet system is calculated at 0.15 gpm/ft² over 1,500 ft². After the NFPA 13 (2007) Ordinary Hazard hose-stream allowance is added, what total water-supply flow is required?
A listed K-8.0 sprinkler operates at 9 psi residual. What is its discharge?
What Hazen-Williams C-factor does NFPA 13 (2007) assign to listed CPVC (plastic) sprinkler pipe?
What is the maximum hanger spacing NFPA 13 (2007) allows for 1-inch steel sprinkler pipe?
A new wet system has 275 sprinklers. How many spare sprinklers must be kept on the premises in a cabinet per NFPA 13 (2007)?
Unless a listed exception applies, new aboveground sprinkler piping is hydrostatically tested at which acceptance pressure and duration per NFPA 13 (2007)?
What is the purpose of a jockey (pressure-maintenance) pump on a fire-pump supply?
A hydraulically calculated remote area is 1,500 ft². What minimum length, measured parallel to the branch lines, does NFPA 13 (2007) require for that rectangle?
Question · Hard
A K-8.0 sprinkler must deliver 32 gpm to meet density. What residual pressure is required at that sprinkler?
An Extra Hazard Group 1 wet system is designed at the NFPA 13 (2007) starting point of 0.30 gpm/ft² over 2,500 ft². What total water-supply flow applies after the Extra Hazard hose stream is added?
The remote sprinklers are 48 feet above the base-of-riser gauge. How much pressure is consumed by elevation alone (use 0.433 psi/ft)?
A C-41a crew is installing the private fire-service lead-in from a water main in the adjoining public right-of-way to the riser. Which statement matches NAC 624.572?
A Light Hazard wet system uses standard spray sprinklers that each cover 180 ft². How many sprinklers must be in the 1,500 ft² remote area?
Under NAC 624.572, C-41b Fixed Fire Extinguishing Systems authorizes work on systems that use which extinguishing media?
Wet Dry Chemical Systems
In NFPA 17 (2009), how does a total-flooding dry-chemical system differ from a local-application system?
Which dry-chemical agent is a multipurpose (ABC) powder suitable for ordinary combustibles as well as flammable-liquid and energized-electrical fires?
Why is a wet-chemical (usually potassium acetate/citrate/carbonate) system selected for a commercial cooking appliance line instead of ordinary ABC dry chemical?
Why does NFPA 12 (2015) treat a total-flooding carbon dioxide discharge as a life-safety event, not just an extinguishing event?
How does NFPA 11 (2016) classify foam by expansion ratio?
Besides automatic detection, what actuation means does NFPA 17 (2009) require on an automatic dry-chemical system?
Where personnel could be exposed to a dry-chemical discharge, what personnel-safety features does NFPA 17 (2009) expect the designer to provide?
May ABC (monoammonium phosphate) and BC (sodium or potassium bicarbonate) dry chemical be mixed in the same piping or reused in a tank that still holds the other agent?
For a hydrocarbon spill protected by film-forming foam (AFFF/FFFP) under NFPA 11 (2016) Type II or Type III application, what minimum solution application rate is the usual starting value?
What minimum discharge duration does NFPA 11 (2016) commonly require for film-forming foam on an indoor hydrocarbon spill using Type II or Type III devices?
What minimum design concentration does NFPA 12 (2015) use for most surface-fire total-flooding carbon dioxide systems?
At 70°F, about what pressure is stored in a high-pressure carbon dioxide cylinder used for an NFPA 12 (2015) system?
In an NFPA 11 (2016) balanced-pressure or bladder-tank foam system, what is the bladder tank’s function?
A low-pressure bulk carbon dioxide storage unit serving an NFPA 12 (2015) system is typically maintained near which condition?
A 2,000 ft² hydrocarbon spill is to be protected with AFFF at 0.10 gpm/ft² for 15 minutes, proportioned at 3 percent. How much foam solution and how much concentrate are required (ignore hose-stream extras)?
For an occupied space protected by a total-flooding CO2 system, which combination matches NFPA 12 (2015) personnel-safety practice?
A paint-spray booth with a flammable-liquid hazard and nearby sensitive electronics is being considered for dry chemical. Which statement is correct under NFPA 17 (2009) practice?
High-expansion foam (expansion 200:1 to 1,000:1) under NFPA 11 (2016) is most often selected for which hazard?
What hose connection does an NFPA 14 (2007) Class I standpipe provide?
Standpipe Systems
What is an NFPA 14 (2007) Class II standpipe system?
How does NFPA 14 (2007) define a Class III standpipe?
What minimum residual pressure must a hydraulically designed Class I or Class III standpipe provide at the most remote 2-1/2-inch hose connection per NFPA 14 (2007)?
What minimum flow and residual pressure apply to a hydraulically designed Class II standpipe per NFPA 14 (2007)?
After the first Class I standpipe is assigned 500 gpm, how much additional flow does NFPA 14 (2007) add for each additional standpipe, and what is the 7.10 cap?
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