What is the maximum allowable water delivery time for a dry pipe system protecting an Ordinary Hazard Group II occupancy?
Answer(s): C
The maximum allowable water delivery time for a dry pipe system protecting an Ordinary Hazard Group II occupancy is addressed under numeral 8.2.3.6
What is the equivalent length of a 45° elbow of 6 in (150 mm) Schedule 10 pipe?
The equivalent length of a 45° elbow for 6 in Schedule 10 pipe is often considered to be around 11.8 ft, accounting for friction loss and the impact on water flow. This equivalent length helps in hydraulic calculations to ensure the sprinkler system meets the required design criteria for pressure and flow.
NFPA 13 and hydraulic calculation principles used in the design and installation of sprinkler systems, including considerations for pipe fittings like elbows.
A paddle-type water flow alarm indicator shall be installed only in
Answer(s): B
16.11.3.4* Paddle-Type Waterflow DevicesPaddle-type water-flow alarm indicators shall be installed in wet systems only.https://up.codes/s/system-attachments
What is the maximum distance an underground main can be installed under the building to the riser location without additional requirements?
NFPA standards allow a certain distance for underground mains to run under a building to the riser without imposing additional requirements. A distance of up to 5 ft is commonly accepted, providing a practical allowance for connecting the underground water supply to the building's sprinkler system while minimizing potential risks.
NFPA guidelines for the installation of fire sprinkler systems, including considerations for underground water supply connections.
Working plans are required to have the total system volume of the system for
Working plans for dry systems are required to include the total system volume, as this information is critical for determining the amount of air or nitrogen needed to pressurize the system and for calculating the time to water delivery. This requirement helps ensure the system's effective operation and quick response in the event of a fire.
NFPA 13 requirements for the documentation and planning of sprinkler systems, emphasizing the importance of detailed system information for dry configurations.
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