Presentation on theme: "Basics of Fire Sprinkler Design"— Presentation transcript:
1Basics of Fire Sprinkler Design K.S. “Buck” Collier
2K.S. CollierNICET Level III Fire Protection Engineering Technology/Water Based Systems Layout.Have worked in industry 28 years.January 1986 to December employed by Commonwealth Sprinkler CompanyFebruary 2000 to present employed by K & E Fire Sprinkler
3Elements with Largest Impact on Sprinkler Design Water SupplyOccupancyBuilding Construction
4Water SupplyBasic Definition- The water that is available to the building/job site. The design of the sprinkler system is based on this available waterVaries from project to projectCan be public or privatePublic- Locality provides water flow dataSome perform hydrant flow testSome provide calculated informationPrivate- designs will include tank and pump
5Water Supply The three elements of the water supply are: Static PressureResidual PressureWater Flow
6Water SupplyStatic Pressure: The pressure available with no water flowResidual Pressure: The pressureavailable with a water flowFlow: The amount of gallons per minute of the water flowThese three make up the Water Supply Curve
10OccupancyThe Fire Hazards are based on fuel load Each Fire Hazard has its own design criteria Design Criteria are the requirements to which the sprinkler system design is based
11Design Criteria Water Density Coverage per Sprinkler Spacing per SprinklerRemote Area
12Design CriteriaWater Density= Gallons per minute (GPM) per sq. ft. covered by the sprinkler Light hazard= .10 gpm per sq. ft. Ordinary hazard Group 1= .15 gpm per sq. ft. Group 2 =.20 gpm per sq. ft. Extra Hazard Group 1 = .30 gpm per sq. ft. Group 2 = .40 gpm per sq. ft
13Design CriteriaCoverage per Sprinkler (max. square footage) Light hazard= 225 sq. ft. Ordinary hazard= 130 sq. ft. Extra Hazard= 100 sq. ft.
14Design CriteriaSpacing for a Standard Sprinkler (max.) Light hazard= 15’-0” Ordinary hazard= 15’-0” Extra Hazard= 12’-0”
15Design CriteraRemote Area- The area that must be proven, by hydraulic calculations, that if all sprinklers activate, the piping and supply can provide the required pressure and gpm Light Hazard- minimum of 1500 sq. ft Ordinary Hazard- minimum of 1500 sq. ft Extra Hazard- minimum of 2500 sq. ft.
18Building Construction Construction of Building Effects Design of Sprinkler SystemSloped CeilingsImpact reaction time of sprinklers thus requiring an increase in remote area size by 30%.1500 sq ft. +30% (450 sq. ft.) = 1950 sq. ft.Unconditioned SpacesDry System required for unconditioned spacesDry Systems impact reaction time of sprinklers thus requiring and increase in remote area size by 30%.
19Building Construction Example: seasonal restaurant seating areaHeated flat ceiling1500 sq ft remote areaUnheated flat ceiling1500 sq ft. +30% (450 sq. ft.) = 1950 sq. ft. remote areaUnheated sloped ceiling1500 sq ft. +30% (450 sq. ft.) = 1950 sq. ft. +30% (585 sq. ft.) = 2535 sq. ft. remote area