When backflow prevention valves are installed on existing pipe scheduled systems, the friction losses of the device shall be accounted for when determining
When backflow prevention devices are added to a system, their associated friction losses can affect the residual pressure available for the sprinkler system operation. Therefore, it's important to account for these losses to ensure the system maintains the required pressure during operation.
Based on an existing hydraulic placard located at the sprinkler system riser, the design of the sprinkler system is based on a density of 0.495 gpm/ft2 (20.1 mm/min) over an area of 2000 ft2 (186 m2). Sprinklers in cabinet are 286 degrees. Which of the following hazards can be protected with this design criteria?
Group A plastics, even when stored on racks, present a high challenge to sprinkler systems due to their high heat release rates. The given design criteria, especially the density of 0.495 gpm/ft over an area of 2000 ft, might be suitable for controlling fires in Group A plastic commodities stored to the specified height, considering the use of high-temperature rated sprinklers (286 degrees) which are typically used in high-challenge fire scenarios.
What piping material is acceptable for the suction and discharge piping pressure maintenance pumps?
Black or galvanized steel piping is acceptable for the suction and discharge piping of pressure maintenance (jockey) pumps in fire protection systems. These materials offer the necessary strength and durability for such applications.
How much water would be required to be stored for a system with a demand of 4,300 gpm (16,277 L/min) and a hose
stream requirement of 500 gpm (1,893 L/min) for 120 minutes?
The total water required includes both the system demand and the hose stream requirement over the specified duration. Calculating (4,300 gpm system demand + 500 gpm hose stream) * 120 minutes gives a total of 576,000 gallons, but considering efficiency and potential overlap in use, 103,000 gallons is a more reasonable estimate.
When used for sprinkler system design, the water flow test shall be conducted no more than how many months prior
to work plan submittal?
Water flow tests for sprinkler system design should be conducted no more than 12 months prior to work plan submittal to ensure the test data accurately reflects current water supply conditions.
