For a hydraulically calculated light hazard area under a mezzanine constructed of 2 in. (50 mm) x 14 in. (350 mm)
combustible solid wood members spaced 4 ft (1.2 m) on center, what is the maximum protection area for standard
upright spray sprinklers?
For a hydraulically calculated light hazard area under a mezzanine with the given construction and spacing, the maximum protection area per standard upright spray sprinkler is typically around 130 ft (12.1 m), considering the obstructions and distribution challenges posed by the mezzanine structure.
How much pressure is lost to friction as 1,200 gpm (4542 L/min) travels through 200 ft (61 m) of 5 in. (130 mm) schedule 40 steel pipe with a C-factor of 120?
The pressure loss due to friction for 1,200 gpm traveling through 200 ft of 5 in. schedule 40 steel pipe with a C-factor of 120 is approximately 21 psi (1.45 bar). This calculation takes into account the flow rate, pipe length, diameter, and roughness factor.
What is the required density for a warehouse with 10 ft (3 m) deep multiple-row racks without an in-rack sprinkler
system that contains a nonencapsulated storing Class IlI commodity on wooden pallets and has a storage height of
18 ft (5.4 m) and 8 ft (2.4 m) aisles, and is using standard, ordinary temperature sprinkler heads?
For a warehouse with the described characteristics, a design density of 0.33 gpm/ft is a common requirement to ensure adequate protection for Class III commodities on wooden pallets, taking into account the storage configuration and commodity type.
A dairy processing plant containing empty plastic crates to a maximum height of 5 ft (1.5 m) should be classified as
what occupancy type?
A dairy processing plant with empty plastic crates up to 5 ft high would typically be classified as Ordinary Group 1. The crates present a moderate fire load, but not as high as would warrant an Ordinary Group 2 or Extra Hazard classification.
After reviewing an existing sprinkler system, it was determined that sprinklers were installed using NFPA 13 using the Ordinary Hazard Pipe Schedule method. The highest elevation of sprinklers is 28 ft (8.53m) and the system is fully monitored as specified by NFPA 13. What is the minimum pressure and flow required?
For a system using the Ordinary Hazard Pipe Schedule method, the minimum pressure and flow required are typically based on the system's design criteria, which for a system fully monitored as specified by NFPA 13 and with the highest elevation of sprinklers at 28 ft, would be around 500 gpm at 27 psi.
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