The “three times rule” to limit the impact of obstructions on water distribution requires that standard sprinklers be located a distance away from the obstruction of at least three times the width of the obstruction. The standard notes a maximum clearance of 24 in. from an obstruction.
A common rule that is followed for obstructions within 18 inches of the sprinkler deflector is the “three times rule”. This requires sprinklers to be positioned away from obstructions a minimum or three times the maximum dimension of the obstruction.
Developed in response to a request from the National Institute of Building Sciences (NIBS), NFPA 3 outlines the commissioning process and integrated testing of fire protection and life safety systems, to ensure systems perform in conformity with the design intent.
3 of NFPA 13, the spacing advantage of the small room rule is that designers may pick one wall and space sprinklers up to 9 ft. away from it. For the rest of the walls, the 7.5 ft. max spacing rule must be followed.
Type 10, therefore, has a 10-second time to readiness: meaning that a source of electrical power of required capacity, reliability, and quality must be provided to life safety loads within 10 seconds following loss or failure of the normal power supply.
This will primarily be determined by the total flow rate and pressure you have available at your source. For example, you generally have a flow rate of 10 gpm from a ¾-inch spigot where you connect your hose. With your 10 gpm flow rate at your spigot, you could run two sprinklers at 5 gpm each.
Light Hazard (10-15 ft). Excluding heads in combustible concealed spaces, all sprinklers in this category have 15 feet (4.6 meters) of maximum allowable spacing between them. Ordinary Hazard (15 ft). All sprinklers in these environments have a 15-foot (4.6-meter) maximum.
If your home's water capacity was 10 GPM, you could place 3 heads per zone. Consult the Performance Charts on or inside the box your sprinkler head came in for your head's exact performance data, or locate the performance data in the Support area of this website.
Severity is indicated by a numerical rating that ranges from 0 (as the minimal hazard) to 4 (as a severe hazard). The 6 o'clock position on the symbol represents special hazards and has a white background.
NFPA 13 covers the installation of fire sprinkler systems; NFPA 72 covers equipment related to fire alarm systems.
NFPA 90A is the Standard for the Installation of Air-Conditioning and Ventilating Systems, and NFPA 90B is the Standard for the Installation of Warm Air Heating and Air-Conditioning Systems. Both standards address the construction, installation, operation, and maintenance of HVAC systems.
Running multiple zones at once is usually not possible due water-pressure and flow limitations at residential properties. As with any standard irrigation controller, you can wire multiple solenoids/valves to the same zone output if you want.
Nothing should be in that area between the bottom of the sprinkler heads and the imaginary horizontal plane parallel to the ceiling that is 18 inches below. This is done to allow an even and unobstructed spray pattern from the sprinklers when triggered to extinguish the fire.
Efficient water distribution is a key goal in irrigation system design. Smaller pipe sizes like 3/4" can offer adequate water flow for many residential systems while promoting water conservation. By designing your system with proper sizing, you can optimize water efficiency and reduce wastage.
Ordinary Hazard 1 and 2: Coverage area of 130 square feet per sprinkler head; 15-foot distance maximum between sprinklers. Extra Hazard 1 and 2: Coverage area of 90-130 square feet per sprinkler head, based on certain factors; 12-foot distance maximum between each sprinkler head.
Maximum sprinkler spacing is defined in NFPA 13 Tables 10.2. 4.2. 1(a) through (d) for Standard Spray Pendent and Upright sprinklers. Minimum sprinkler spacing is 6-ft (1.8 meters) for standard spray pendents and uprights, from Section 10.2.
In buildings sprinklered in accordance with NFPA 13, closets shall meet the following requirements: Closets of less than 12 ft2 (1.1 m2) in individual dwelling units shall not be required to be sprinklered.
We recommend that you use 40 psi when designing your system. Example: if your sprinkler heads use 2.5 gpm @ 40 psi, then a ¾” service (20 gpm) could operate approximately 8 heads at one time. Based on this example calculation, you would not have more than 8 heads on at one time.
You can operate 2 or 3 sprinklers at one time with 'Y's and extra hoses, depending on your water pressure. To run more than one sprinkler off the same faucet, attach a 'Y' to your faucet and run a hose to each sprinkler.
Yes, the longer the hose, the less water pressure there will be at the far end. This is because the water has further to travel, and more surface area to come into contact with.
The NFPA 72 "covers the application, installation, location, performance, inspection, testing, and maintenance of fire alarm systems, supervising station alarm systems, public emergency alarm reporting systems, fire warning equipment and emergency communications systems (ECS), and their components." Federal, state, and ...
Rather than safety or maintenance practices, NFPA 70 revolves around installing and maintaining electrical equipment. Its intent is to provide practical safeguarding practices that can protect both people and property from electrical hazards that can arise when users install electrical components.
NFPA 20 protects life and property by providing requirements for the selection and installation of pumps to ensure that systems will work as intended to deliver adequate and reliable water supplies in a fire emergency.