Low pressure, extended coverage, fire protection sprinkler
A low pressure, extended coverage, fire protection sprinkler, e.g., of the upright type, suitable for use in protection of at least extra hazard and high piled storage occupancies, in accordance with the 1999 Edition of NFPA 13, has a body with an internal passageway extending between an inlet end and an opposite outlet end, and a deflector mounted to the body by at least one support arm and disposed in alignment with the axis and generally spaced from the outlet end of the internal passageway. The sprinkler has a predetermined K-factor, e.g., of greater than about 16.0. The sprinkler is configured and arranged to deflect flow of water generally radially outwardly and downwardly of the sprinkler in a predetermined spray pattern. Preferably, the predetermined spray pattern has a generally polygonal shape, e.g., a rectangular shape, when viewed at a predetermined distance below the deflector.
1. A control mode extended coverage specific application fire protection sprinkler for storage applications that connects to a piping network to protect commodity hazards, the sprinkler comprising:
a body defining a passageway between an inlet and an outlet along a longitudinal axis, the passageway having a rated K-factor of greater than about 16.0;
a closure positioned proximate the outlet opening so as to occlude the passageway in an unactuated position;
a heat responsive trigger that retains the closure to occlude the passageway; and
a deflector assembly that distributes fluid fed to the inlet at a certain pressure to provide a coverage area of at least 144 square feet and a generally polygonal spray pattern.
2. The sprinkler according to claim 1 , wherein the K-factor is at least 25.2.
3. The sprinkler according to claim 1 , wherein the sprinkler provides coverage of at least 196 square feet.
4. The sprinkler according to claim 1 , wherein the generally polygonal spray pattern is defined by water collected in a 20 ft. long array of twenty 1 ft.×1 ft. pans in the protection area about 10 ft. below the deflector at a minimum average rate, the array having a longitudinal centerline offset 10 ft. from either side of the plane and further having a lateral centerline extending perpendicular to the plane and intersecting the axis, for the flow of water to the inlet at a pressure of about 16 psig, the minimum average rate being at least 0.05 gallons per minute per square foot,
5. The sprinkler according to claim 1 , wherein the generally polygonal spray pattern is further defined by water collected in about a one foot by one foot portion of the protection area about 3 ft, below the deflector centered at about an 8 ft. radius from the axis and about (45°) forty-five degrees relative to the plane being greater than water collected in a one by one foot portion about 3 ft, below the deflector centered in the plane and at about an 8 ft. radios from the axis or than in a one by one foot portion centered perpendicular to the plane at about an 8 ft. radius from the axis, for the flow of water to the inlet at a pressure of about 16 psig.
6. The sprinkler according to claim 1 , wherein the generally polygonal spray pattern is further defined by water collected about 4 ft, below the deflector at a minimum rate, in a portion of the protection area, the portion being about a one foot in one foot area centered about 9 ft. from the axis and about (45°) forty-five degrees relative to the plane and parallel to the direction defined by at least one of the openings, for the flow of water to the inlet at a pressure of about 15 psig, the minimum rate being 0.15 gallons per minute per square foot.