A fire sprinkler system is a widely used fixed firefighting device, characterized by its low cost and high firefighting efficiency. Depending on its function, it can be divided into two types: manually controlled and automatically controlled. Fire sprinkler systems are equipped with alarm smoke sensors and alarm devices. When a fire breaks out, the sprinkler head ruptures, automatically sounding an alarm. The automatically controlled fire sprinkler system and other firefighting equipment work together to quickly and effectively control and extinguish an initial fire.
A fire sprinkler system is a firefighting device used to spray water mist in the early stages of a fire to extinguish and control the spread of the fire. A fire sprinkler system generally consists of steel pipes, fire fighting grooved fittings, threaded fittings, sprinkler heads, valves, and fire pumps. The sprinkler system piping is a crucial component connecting the sprinkler heads, and the pipe size within the fire piping system is also crucial.
I. Pipe Specifications in Fire Systems
The steel pipe specifications for fire sprinkler systems must be selected in accordance with fire safety standards. Common steel pipe sizes include DN15 (1/2″), DN20 (3/4″), DN25 (1″), DN32 (1 1/4″), DN40 (1 1/2″), and DN50 (2″), with DN15 (1/2″) and DN20 (3/4″) being the most common sizes.
II. Fire Pipe Materials
Fire sprinkler system pipe materials must possess high corrosion resistance and high-temperature resistance. Currently, commonly used fire pipes include galvanized steel pipe and stainless steel pipe. Galvanized steel pipe is a common choice, but it is susceptible to oxidation in high-temperature environments. Stainless steel pipe offers better high-temperature resistance. Galvanized steel pipe in fire pipes generally requires FM certification and UL certification. Main pipes typically use grooved connections, while branch pipes typically use sealed threaded connections, such as BSPT and NPT threads.
III. Fire Pipe Layout
The layout of fire sprinkler pipes must be based on the height and width of fire escapes to avoid obstructing the movement of firefighters. Pay attention to the distance between the pipe and the roof, walls, and other surfaces to ensure that the water mist can be sprayed directly into the fire and effectively extinguish it. Fire regulations also provide specific requirements for pipe layout based on the different uses and heights of buildings. Pendent sprinklers are the most widely used type of sprinkler. They are installed pendently on the water supply branch pipe and spray water in a parabolic pattern, directing 80% to 100% of the total water volume toward the ground. They are primarily used in locations where decoration is not required, such as workshops, warehouses, parking garages, and kitchens.
Upright sprinklers are installed upright on the water supply branch pipe and spray water in a parabolic pattern, directing 80% to 100% of the total water volume downward, while also directing a portion toward the ceiling. They are suitable for installation in locations with frequent moving objects and potential impact, such as warehouses. They can also be concealed in the ceiling of a room’s mezzanine to protect the ceiling where flammable materials are present. Standard sprinklers can be installed directly or pendently on the sprinkler network, directing 40% to 60% of the total water volume downward, with the majority directed toward the ceiling. Suitable for use in restaurants, shops, warehouses, underground garages, and other locations.
Sidewall sprinklers are installed against the wall, making them suitable for locations with challenging plumbing arrangements. They are primarily used in less hazardous areas of buildings, such as offices, foyers, lounges, corridors, and guest rooms.
IV. Fire Pipe Connection Methods
Fire pipe connections generally utilize threaded, grooved, or flanged connections. Grooved and flanged connections are removable, facilitating equipment maintenance and repair. In addition, rubber washers or gaskets are required at pipe joints to ensure a tight seal. Grooved pipe fittings are extremely simple to connect, requiring no specialized skills, and can be performed by ordinary workers with minimal training. Connecting a single grooved pipe fitting takes only minutes, minimizing on-site technical complexity, saving time, and ensuring project quality and efficiency. The key features of flange connections are easy disassembly, high strength, and excellent sealing performance. During installation, the two flanges must be parallel, and the sealing surfaces must be free of bruises and kept clean. Flange gaskets should be selected according to design specifications.
V. Seismic Supports and Pipe Support for Fire Protection Pipes
Pipes require support during operation. Pipe supports should be selected based on the pipe diameter and weight, as well as whether the building is located in a seismic zone. Fire protection regulations specify the number and spacing of pipe supports for different fire protection pipe sizes. Pipe supports typically utilize galvanized steel brackets or pipe hangers. The seismic support and hanger system for fire protection includes anchors and expansion bolt assemblies for connection to the building structure; reinforcement hangers made of cold-formed C-channel steel; seismic connectors with hinged connections with locking features; and seismic braces made of adjustable galvanized steel pipe assemblies (with an installation angle range of 30°-45°).
Overall, the standard specifications and dimensions of fire sprinkler pipes in fire protection systems are crucial for ensuring the safe and effective operation of fire protection facilities. Selection and layout must comply with international fire protection standards and regulations. Furthermore, to ensure the integrity of fire protection equipment and the safety and reliability of the piping system, regular inspection and maintenance of fire sprinkler pipes is essential to promptly identify and resolve any problems.
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