Sidewall sprinkler deflectors shall be located not more than 6 in. (150 mm) or less than 4 in. (100 mm) from walls on which they are mounted.
Sprinklers shall be located a minimum of 4 in. (100 mm) from a wall.
Sprinkler spacing.
The minimum vertical clearance between sprinklers and material below shall be 18 inches (45.7 cm).
Under the Small Room Rule, sprinklers are permitted to be spaced up to 9-ft (2.7 m) from any single wall, if the room qualifies as a small room. Sprinklers cannot be closer than 4-inches (100 mm) to an adjacent wall.
Sprinkler heads sit just below or flush with the ground, so a sturdy trowel is typically suitable for digging up the head. Remove the sod or patch of grass around the head carefully so that it can be replaced later.
Do not install cable trays, heating ducts or other large obstructions closer than 3 times its width, to a sprinkler head. (i.e. if the duct is 2 ft (0.6 m) wide, then it should be 6ft (1.8 m) from the sprinkler head.)
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.
The answer is that you should follow the general obstruction rules of NFPA 13. For obstructions below 18 inches for standard pendent and upright spray sprinklers this means that as long as the obstruction is less than 4ft (1.2 m) wide that it is not considered an obstruction.
The 18-inch vertical clearance requirement is treated as a horizontal plane throughout the storage area or room. All materials must be stored below this horizontal plane.
3 of NFPA 13: If the distance between the obstruction and the bottom of the horizontal sidewall sprinkler is up to 4 in., then the minimum distance of 6 ft and maximum distance of 6. 6 ft is required to be maintained between the sprinkler and the obstruction as described in Table 8.7.
The purpose of the “18-inch rule” is to prevent storage or any other obstruction from interfering with the spray of water from a sprinkler head during a fire. It is intended to prevent a situation in which the obstruction is within 18-inches of the ceiling and might be between the sprinkler head and the fire.
3.3, branch lines shall not exceed eight sprinklers on either side of a cross main.
Clearance distance between a hanger and the centerline of an upright sprinkler shall be no less than 3 in. Min. Number of hangers: One (1) per section of pipe • Hanger maximum spacing: 12 ft, for sprinkler spacing < 6 ft.
The Benefits of Sidewall Fire Sprinklers
Sidewall fire sprinklers, as the name suggests, protrude from the side of a wall, as opposed to hanging down from the ceiling. Sidewall fire sprinklers are ideal to use in situations where ceiling access is limited or where freezing is a potential concern.
All standard sprinkler heads—pendent, upright, and sidewall—have the same minimum sprinkler distance from walls: four inches. For sidewall heads, that's the distance from an end wall (10.3. 4.3.
Placing sprinklers 9 ft.
(2.3 m) from any wall. This stipulation is found in section 10.2. 5.2. 1 of NFPA 13, which states that the distance from the sprinkler to the wall can be no more than one-half the allowable distance between sprinklers.
1.3 lays out the “Three Times Rule” which states that unless specific requirements are met that “sprinklers shall be positioned away from obstructions a minimum distance of three times the maximum dimensions of the obstruction”, up to a maximum of 24 inches (0.6096 m) though the “maximum clear distance does not apply ...
LL26 was designed to improve the fire safety of NYC buildings. This law requires buildings classified as business occupancies that are at least 100 feet tall to have automatic fire sprinkler systems.
3.1, 18.4(d) and 19.1.2.3, where the maximum ceiling/roof height is 40 feet.
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.
The top of the new sprinkler head should be level with the ground, not with the grass. The sprinkler head is susceptible to damage from weed whackers, mowers and foot traffic if it's installed any higher.