Ceiling-Only Sprinklers for High-Piled Storage Fire Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current automatic fire sprinkler systems face limitations in providing effective ceiling-only suppression mode fire protection for high-piled storage at heights exceeding 45 feet, particularly for high-hazard commodities like cartoned unexpanded plastic, as existing standards and commercial systems are not sufficient for ceiling heights over 45 feet and up to 50 feet.
Innovation Solution
A suppression-mode ceiling-only storage occupancy fire protection system is designed with a grid of pendent sprinklers, each with a nominal K-factor of 25.2 to 36.4 GPM/(psi)1/2, a thermally responsive trigger assembly with an RTI of 50 or less, and a deflector configuration, installed in a network of pipes to provide a hydraulic design area with 5 to 12 hydraulically remote sprinklers, capable of delivering a minimum flowing pressure of 80 psi and flow rate of approximately 2000 GPM, covering up to 55 feet ceiling height and 50 feet storage height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If ceiling-only sprinkler systems are used for high-piled storage, then installation complexity is reduced and maintenance is simplified, but fire suppression effectiveness deteriorates at ceiling heights exceeding 45 feet
Solution Approach 1:
The patent changes key parameters of the sprinkler system including using high K-factor sprinklers (K=11.2 to K=80.0) to increase water discharge capacity, reducing sprinkler spacing to 8-12 feet to improve coverage density, and specifying minimum operating pressures (75-150 psi) to ensure adequate water delivery at heights up to 55 feet, thereby maintaining suppression effectiveness while preserving ceiling-only installation simplicity
Solution Approach 2:
The system dynamically adapts to height variations by providing different design criteria for different ceiling height ranges (e.g., 30-45 feet versus 45-55 feet), adjusting sprinkler K-factor selections, spacing requirements, and hydraulic design parameters based on the specific installation height to optimize performance across varying conditions
2Adaptability or versatility
If standard sprinkler systems are used for storage heights up to 50 feet, then compatibility with existing standards is maintained, but fire suppression capability is insufficient for high-hazard commodities
Solution Approach 1:
The patent modifies standard system parameters by specifying enhanced sprinkler K-factors (K=11.2 to K=80.0 versus standard K=5.6), reduced spacing (8-12 feet versus typical 12-18 feet), and elevated minimum operating pressures (75-150 psi versus standard 50-75 psi) to achieve superior fire suppression capability for high-hazard commodities while maintaining compatibility with NFPA 13 and FM 8-9 framework
Solution Approach 2:
The system applies locally optimized parameters for high-hazard areas, using higher K-factor sprinklers and closer spacing in zones storing high-hazard commodities like cartoned unexpanded plastic, while allowing standard parameters in lower-hazard areas, thereby achieving enhanced suppression capability where needed while maintaining overall system compatibility with existing standards
3Volume of moving object
If ceiling height is increased to accommodate more storage, then storage capacity is improved, but fire protection coverage becomes insufficient
Solution Approach 1:
The system dynamically scales its design parameters with ceiling height, providing specific design criteria for different height ranges (30-45 feet, 45-55 feet), adjusting sprinkler K-factor selections, spacing requirements, and hydraulic calculations to maintain adequate fire protection coverage as storage capacity increases with height
Solution Approach 2:
The patent changes system parameters to compensate for increased height, using higher K-factor sprinklers, reduced spacing, and elevated minimum pressure requirements to ensure that fire protection coverage remains sufficient even as ceiling height increases to accommodate greater storage capacity
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
This system effectively provides ceiling-only suppression mode fire protection for high-piled storage, including high-hazard commodities, by ensuring that the sprinklers can suppress fires at heights not previously covered by commercial systems or industry standards, with full-scale fire tests demonstrating containment of fires and compliance with industry standards.
Implementation Method 1
a thermally responsive trigger assembly with an RTI of 50 or less
Implementation Method 2
delivering a minimum flowing pressure of 80 psi and flow rate of approximately 2000 GPM
Data Source
AI summary
System and methods to provide ceiling-only suppression fire protection of up to fifty feet (50 ft.) of rack storage of cartoned unexpanded plastic commodities and less hazardous commodities, such as for example, Class 1, Class 2, Class 3, Class 4 and/or combinations thereof beneath a ceiling having a maximum ceiling height up to fifty-five feet (55 ft.). The systems and methods provide for hydraulic and system parameters that include a hydraulic design area based upon five to no more than twelve hydraulically most remote sprinklers spaced at a preferred sprinkler-to-sprinkler spacing of eight to ten feet (8-10 ft.) coupled to two to four branch lines tied to a common cross main supply pipe of firefighting fluid.