Unless specific conditions are satisfied, the distance between the deflector and the top of storage must be at least 18 inches, according to NFPA 13 (2016) 8.5. 6.1. As a result, building owners must guarantee that all storage and objects in the room are 18 inches or less below the sprinkler deflector, as indicated in the figure below.
The requirement for adequate clearance exists so that if water does flow from the sprinkler when it activates, it will not hit objects below the deflector.
Clearance distances vary depending on the type of sprinkler. For example, with an extended reach spray pattern, water may still flow after the roof has been wetted, so the minimum clearance below such a nozzle should be 24 inches. Nozzle types other than extended reach ones may produce dry spots on surfaces below their effective range. In this case, too, the clearance should be 24 inches.
For another example, a square center pivot system requires 30 inches clearance below its drip edge or guard rail for proper operation. The drip edge/guard rail provides protection against people and vehicles walking into areas where water can accumulate before it reaches the ground. It also helps prevent lawn furniture and other objects from being washed away by running water.
Drip edges come in different shapes and sizes. The one shown here is made of plastic and measures 12 inches by 36 inches. It can be placed under most standard flat-top sprinklers.
Six feet is the minimum distance between two sprinklers. The greatest distance from a wall that a sprinkler can be put is half the maximum spacing between two sprinklers. A sprinkler can be positioned as close to a wall as 4 inches. This allows for half-max sprinklers.
The best way to avoid having any water spill onto walls or other expensive plumbing fixtures is to keep pipe diameters small. The more often a sprinkler activates, the more water it will spray. Try to keep the number of zones per irrigation system to no more than four or five. If you have more than this, you will need multiple systems to cover the same area.
The closer together your sprinklers are placed, the more water they will spray. However, they should be at least six feet apart in order for enough space to develop between them so that you do not get clogs from tree roots or other obstacles.
If you want to cover a large area, then you will need to install many individual sprinklers. They do not have to be connected to one another. But if you want to use one source for all of the water for these areas, then you can connect them with underground piping.
Sidewall sprinklers must be positioned at least 8 feet (2.3 meters) away from light fixtures or other similar impediments. The distance between light fixtures or similar impediments positioned greater than 8 ft (2.3 m) from the sprinkler is specified in Table 4-9.5. If you have any questions about how close you should position light fixtures or similar impediments to sprinklers, contact an irrigation professional.
The actual coverage provided by a sidewall sprinkler depends on several factors such as soil type and moisture content, but generally speaking, you should get at least 10 square feet (0.9 sq meter) of coverage with a sidewall sprinkler. For example, if you have a yard that's mostly grass, you'll need to set your sprinkler to cover more area so that it doesn't over-water the grass. Sidewalk sprinklers are also effective for reducing water consumption when watering front yards only; backyards can be watered with a center-set sprinkler, which will not waste water spraying onto itself.
Table 4-9.5 specifies the minimum separation distances between light fixtures or similar impediments and various types of sprinklers. Separation distances may vary depending on the type of fixture or obstruction.
Type of Fixture or Obstruction Minimum Separation Distance From Horizontal Centerline Of Sprinkler Water output range Type A & B Light Fixtures or Similar Impediments 8 feet 2.
Typically, the minimum distance between sprinklers is 6'0'. Minimum distance from ceiling: 1 ", maximum distance from ceiling: 12 "for unobstructed construction. A minimum of 1" from the ceiling is customary; however, hidden, recessed, and flush sprinklers may be set less than 1" from the ceiling and must be installed in accordance with their listing.
The National Fire Protection Association (NFPA) publishes an official code for architects and engineers-called the International Building Code (IBC). The IBC specifies the requirements for the installation of fire protection systems in buildings. The NFPA code requires that all fire sprinkler systems be installed at least 18 inches from the nearest wall. This provides a clear path should there be a need to open a water supply valve in the event of a fire.
This guideline was adopted to provide a clear zone around each sprinkler for emergency personnel to navigate through in case of fire. It also ensures that there is enough space between sprinklers so that you don't end up with two heads spraying each other out of sequence if one head gets clogged.
An acceptable alternative is to have one-fourth to one-half of the ceiling height above which all sprinklers are located. For example, if your ceiling is 10 feet high, then all sprinklers would be located no lower than 3 feet off the floor.