Extended Coverage Pendent Sprinkler K-Factor Optimization
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Solution Overview
Problem
Existing extended coverage sprinklers, such as the EC K-25, overdischarge fluid in areas requiring design densities less than 0.36 gpm/sq. ft., failing to provide adequate protection for occupancies with lower density needs while adhering to NFPA standards for maximum coverage areas.
Innovation Solution
A pendent sprinkler with a K-factor ranging from 11 gpm/(psi)1/2 to 25 gpm/(psi)1/2, featuring a deflector with specific slot configurations and angles, providing an average density of 0.23 gpm/sq. ft. or higher for a 196 square foot coverage area, suitable for occupancies greater than ordinary hazard, and adjustable spacing from 10 to 15 feet to optimize fluid distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If existing extended coverage sprinklers (EC K-25) are used to achieve maximum coverage area of 196 square feet, then coverage area is improved, but fluid overdischarge occurs in areas requiring design densities less than 0.36 gpm/sq. ft.
Solution Approach 1:
The patent changes the K-factor parameter from the conventional 25 to a lower value ranging from 11 to 25 gpm/(psi)^1/2. This parameter change allows the sprinkler to maintain the required coverage area of 196 square feet while reducing the fluid discharge rate to match lower design density requirements (0.23 gpm/sq. ft. or higher), thereby eliminating fluid overdischarge in areas with lower hazard classifications.
2Device complexity
If sprinkler spacing is increased to reduce the number of sprinklers needed, then device complexity is reduced, but fluid distribution uniformity may deteriorate
Solution Approach 1:
The patent optimizes the deflector geometry parameters including slot configurations, angles, and dimensions to achieve uniform fluid distribution across extended spacing distances of 10 to 15 feet. The deflector is designed with specific slot patterns that maintain consistent spray coverage and density uniformity even at maximum spacing intervals, allowing reduced sprinkler density while preserving distribution quality.
Solution Approach 2:
The patent transitions from conventional spray patterns to an extended coverage pattern that distributes water over a larger horizontal area. The deflector geometry is designed to throw water radially outward to the periphery of the 196 square foot coverage area, creating a more uniform distribution across the expanded space and enabling greater sprinkler spacing while maintaining coverage uniformity.
3Adaptability or versatility
If conventional sprinklers are used in retail spaces with finished ceilings, then installation flexibility is maintained, but coverage effectiveness deteriorates due to prohibited configurations
Solution Approach 1:
The patent modifies the sprinkler parameters including lower K-factor (11-25), reduced operating pressure (minimum 7 psi), and optimized deflector geometry to achieve effective coverage in restricted spaces. These parameter changes enable the sprinkler to penetrate finished ceilings and provide adequate coverage in retail environments where conventional sprinklers would be prohibited or ineffective, thereby maintaining both installation flexibility and coverage reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The sprinkler achieves extended coverage fire protection with reduced fluid overdischarge, effectively addressing lower density requirements and adhering to NFPA standards, potentially reducing the number of sprinklers needed for a given area and allowing installation in previously prohibited configurations like retail spaces with finished ceilings.
Implementation Method 1
a body having an inlet and an outlet spaced from the inlet to define a passageway
Implementation Method 2
At its minimum operating pressure of 7 psi., and the maximum spacing of 196 sq. ft.
Implementation Method 3
The deflector is configured to distribute the water to the periphery of a coverage area
Implementation Method 4
provides an average density of 0.23 gpm/sq. ft. or higher for the maximum 196 square foot per sprinkler coverage area
Data Source
AI summary
An extended coverage pendent sprinkler configured for the fire protection of an occupancy classified as any one of: light hazard, ordinary hazard, extra hazard, rack storage with solid shelves and any combination thereof. The sprinkler preferably includes a body having an inlet and an outlet spaced from the inlet to define a passageway to further define a sprinkler axis and a K factor ranging from 11 gpm/(psi)1/2 to about 25 gpm/(psi)1/2. A deflector is spaced from the outlet to distribute a fire fighting fluid over a maximum protection area of about 196 square feet, and having one or more combination of features as described in the preferred deflector described herein.