EP2293852A1 - Fire sprinkler system - Google Patents
Fire sprinkler systemInfo
- Publication number
- EP2293852A1 EP2293852A1 EP09749806A EP09749806A EP2293852A1 EP 2293852 A1 EP2293852 A1 EP 2293852A1 EP 09749806 A EP09749806 A EP 09749806A EP 09749806 A EP09749806 A EP 09749806A EP 2293852 A1 EP2293852 A1 EP 2293852A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rack
- sprinkler system
- fire sprinkler
- fire
- ceiling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/002—Fire prevention, containment or extinguishing specially adapted for particular objects or places for warehouses, storage areas or other installations for storing goods
Definitions
- the present invention generally relates to sprinklers used in automatic fire protection systems for storage buildings, warehouses and the like.
- sprinkler heads include a solid metal base connected to a pressurized supply of water, and some type of deflector used to alter the trajectory of the water flow. Alteration of the water flow by the deflector generates a defined spray distribution pattern over the protected area.
- the deflector is typically spaced from the outlet of the base by a frame, and a fusible trigger assembly secures a seal over the central orifice.
- the fusible trigger assembly releases the seal and water flow is initiated through the sprinkler head.
- fire control a relatively large number of individual sprinklers will activate upon detection of a fire. That is, in response to a fire, not only will the sprinklers closest to the fire be actuated, but also sprinklers, which protect the areas surrounding the fire, so as to define a controlled area.
- the fire control method seeks to confine the fire within a predetermined area until additional fire fighting methods are deployed, such as response by a fire department, in order to extinguish the fire.
- An alternative to traditional ceiling sprinklers that allows for high rise storage racks is a system combining ceiling sprinklers with in-rack or aisle sprinklers.
- sprinklers are thus installed within the storage array defined by the rack. These sprinklers typically oppose vertical fire growth up as well as horizontal fire spread within the rack.
- Flue spaces are open spaces between rows of storage.
- the longitudinal flue spaces are perpendicular to the direction of loading, and transverse flue spaces are parallel to the direction of loading.
- Horizontal barriers are solid sheets on a horizontal plane within a rack, beneath which in rack sprinklers are installed. They extend to both ends and aisle faces of the rack. Their purpose is to impede vertical fire spread by blocking off normally open flue spaces, while also helping to achieve prompt in-rack sprinkler operation by banking heat down to the in-rack sprinklers that must be installed under each barrier.
- ESFR Error Suppression Fast Response
- ESFR sprinklers In order to achieve the goal of early suppression, ESFR sprinklers must quickly generate a sufficient quantity of water capable of penetrating the fire plume and thus be delivered to the core of the fire, often referred to in the industry as the "fuel package.” To deliver a sufficient quantity of water to the "fuel package”, ESFR sprinklers are equipped with a thermally sensitive fusible trigger assembly capable of actuating the sprinkler head shortly after ignition of the fuel package. US 7,036,603, e.g., describes an ESFR sprinkler systems.
- the FMRC in conjunction with the NFPA, have established "commodity" classifications which categorizes materials commonly found in warehouses or storage facilities.
- a European classification also exists, but is less detailed.
- Each commodity classification segregates materials according to their degree of combustibility and the operating requirements necessary to extinguish them. For each of these commodities, a particular sprinkler head must meet certain water properties (supply and discharge requirements) in order to provide adequate protection.
- materials are classified in the following commodity classifications: class 1 through 4 and Plastics, the latter being further detailed as: carton unexpanded plastic, cartoned expanded plastic, uncartoned unexpanded plastic and uncartoned expanded plastic.
- uncartoned unexpanded and expanded plastic commodities represent the two most challenging fire hazards, with uncartoned expanded plastic carton commodities representing the most challenging fire scenario.
- Expanded plastic is classified in the highest hazard class HHS4 of the European classification.
- ESFR sprinklers have a large discharge coefficient, K-Factor, and are designed for a rapid activation, as indicated by their low Response Time Index (RTI).
- RTI Response Time Index
- K Q-P 1 ' 2 , where Q represents the flow rate (in L/min) of water from the outlet of the internal passage through the sprinkler body and P represents the pressure (in bars) of water fed into the inlet end of the internal passageway though the sprinkler body.
- the RTI value is essentially a measure of the thermal sensitivity of the fusible trigger assembly, which actuates the sprinkler head. Consequently, the lower the RTI value of a particular sprinkler, the faster the actuation time of the sprinkler head in response to a fire. As it appears from the above, the art of fire sprinklers is highly empirical.
- the ESFR sprinklers (called “Suppression Mode” sprinklers in FMRC documents) have a K-factor of 200 L/(min-bar % ) (14 gpm/(psi) % ) at 6.9 bars (100 psi), i.e. providing a density of 58.4 mm/min (1 ,43 gpm/ft 2 ) with a sprinkler spacing of 3 m (10 ft).
- the object of the present invention is to provide an alternative type of fire sprinkler system that is suitable for high-rise storage heights and that does not require in-rack sprinklers.
- the present inventors have considered that the ESFR sprinkler concept, while being very satisfactory from the logistical point of view, relied on a philosophy that was not optimal. Indeed, quick activation of the sprinklers, in particular when backed-up with fast in-rack sprinklers, causes a significant decrease in the water pressure delivered to each individual sprinkler head. Less water is thus available for delivery to the fire and provides an opportunity for the fire to spread. Furthermore, actuation of remotely located sprinkler heads results in water damage to the products protected by such sprinklers. Also, early activation of sprinklers leads to a quicker consumption of water resources, which may thus compromise the water feed over time.
- the present invention concerns a fire sprinkler system for an enclosure, namely a warehouse or the like, which has a ceiling and a floor, and has a storage area comprising one or more racks for the storage of goods, namely flammable goods.
- the racks offer a storage height that may be up to 8.5 m (27.89 ft) and comprise vertical solid barriers extending over the rack's depth and storage height, the maximum distance between two successive solid barriers being about 5.8 m (19.03 ft).
- the sprinkler system comprises ceiling-level sprinklers having a standard thermal sensitivity, i.e. having a RTI of 80 or greater.
- the present sprinkler system associating standard response sprinklers with the passive protection provided by vertical barriers, permits controlling a fire of very hazardous products in high- rise storage racks.
- the popular ESFR sprinkler technology that uses quick- or fast-response sprinklers and requires both longitudinal and transverse flues
- the present sprinkler system has proved efficient while using standard-response sprinklers.
- the use of slower response sprinklers results in the triggering of a fewer amount of sprinklers; this is favourable in terms of water pressure and autonomy.
- the present sprinkler requires less water than the very water-demanding ESFR concept described in above- mentioned FM data sheet 8-9.
- transverse flues are no longer needed, which facilitates the storage of pallets with varying sizes in the racks.
- the K-factor is of at least 115 L/(min bar % ) (8 gpm/(psi) /2 ), more preferably above 160 L/(min-bar % ) (11 gpm/(psi) % ) and even above 260 L/(min-bar % ) (18.1 gpm/(psi) % ).
- the K-factor may be in the range of 160 L/(min-bar % ) to 290 L/(min-bar % ) (11 gpm/(psi) % to 20.1 gpm/(psi) % ), or more preferably between 260 L/(min-bar % ) and 290 L/(min-bar % ) (18.1 gpm/(psi) % to 20.1 gpm/(psi) % ).
- RTI and K-factor mentioned herein are to be interpreted in accordance with European standard EN 12259-1 for fixed firefighting systems (components for sprinkler and water spray systems - Part 1 : Sprinklers).
- the sprinkler spacing when a lower K-factor is used the sprinkler spacing shall be reduced as well.
- the sprinkler spacing may be between 2 and 3 m (6.56 to 9.84 ft).
- the sprinkler spacing, K-factor and supply pressure are determined so as to provide a density of minimum 45 mm/min (1.10 gpm/ft 2 ), preferably minimum 50 mm/min (1.23 gpm/ft 2 ).
- the design density may be less than 70 mm/min (or 70 L/(min-m 2 ).
- the density values given herein are also expressed in accordance with EN 12845, "Fixed fire- fighting systems - Automatic sprinkler systems - Design, installation and maintenance" or CEA 4001 , "Sprinkler Systems, Planning and Installation".
- the ceiling height may be as high as 12 m (39.37 ft), and the storage height may reach 8.5 m (27.89 ft).
- the present system is thus especially designed for rack storage in warehouses having a ceiling height of between 10 and 12 m (32.80 to 39.37 ft), and where the storage height is between 6.5 and 8.5 m (21.33 to 27.89 ft) and especially between 7.5 and 8.5 m (24.61 and 27.89 ft).
- the vertical barrier has a height of up to 8.5 m, or between 6.5 and 8.5 and specifically between 7.5 and 8.5 m.
- the present system may however also be used for lower ceiling and storage heights.
- the racks are of the double row rack type, but single row racks and multiple row racks can also be used provided that the solid vertical barriers properly span over the entire width and storage height. More preferably, double row racks are used in the storage area, which are designed to offer a max. storage height of 8.5 m (27.89 ft) and a max. storage depth (width) of 4.6 m, (15.09 ft) including a longitudinal flue space of min. 0.2 m (7.87 in).
- the rack shelves may be open (or slatted) or full shelves (without openings). The distance between two consecutive shelves may typically be between 0.75 and 1.5 m.
- the rack structure is preferably of metal.
- the solid vertical barriers preferably consist of non-combustible material such as sheet metal.
- non-combustible material such as sheet metal.
- a 1 to 2 mm (0.04" to 0.08") thick (or even greater) metal sheet may be used as vertical barrier.
- combustible materials e.g. plywood, with sufficient thickness can be utilised as well; especially surface-treated combustible material (e.g. coated with fire retardant material) that is consequently classified as non-combustible.
- the thickness is preferably no less than 10 mm, more preferably no less than 13 mm ( 1 /4").
- the solid vertical barriers span vertically the entire width and storage height, covering the longitudinal flue spaces, preferably with a maximum 75 mm (3") opening at the rack's structural elements.
- the ceiling-level sprinklers to be employed in the present system present one or more of the following characteristics:
- - min design density 50 mm/min (1.23 gpm/ft 2 ), preferably between 56 (1.38 gpm/ft 2 ) and 65 mm/min (1.60 gpm/ft 2 );
- - distance to ceiling between 7.5 cm to 50 cm, preferably not more than
- the extinguishing agent any be water or any appropriate fluid.
- the water supply in the piping network connecting the sprinklers is preferably designed to provide the sprinklers with water at the allowed pressure range for normal spray sprinklers, which means between 0.5 and 12 bar.
- the pressure for the normal spacing of 3 m may be about 3.4 bars.
- the present system has been developed for the storage of very hazardous goods, such as plastics goods, and more specifically exposed expanded plastics, exposed plastic goods and candles.
- very hazardous goods such as plastics goods, and more specifically exposed expanded plastics, exposed plastic goods and candles.
- candles and exposed expanded plastic are the highest hazard categories.
- the present system is suited for protection of materials having a heat of combustion generally ranging between 12,000 and 20,000 Btu/lb (27,910-46,520 kJ/kg).
- FIG. 1 is schematic view of a preferred embodiment of the present fire sprinkler system
- FIG. 2 is a view of the rack of Fig.1 , from its small side;
- FIG. 3 is a sketch illustrating the storage rack and sprinkler locations as used in example 1 ;
- FIG. 4 is a graph showing the result of the opening of the sprinklers on the temperature of the rack in the vicinity of the ignition point in example 1.
- FIGs. 1 and 2 schematically illustrate a preferred arrangement of a fire sprinkler system and storage rack in accordance with the invention.
- Reference sign 10 indicates a double row rack installed in a storage area of a warehouse or other enclosure (with floor 12 and ceiling 14), which has a max. ceiling height of 12 m.
- the rack 10 offers a max. storage height of 8.5 m, i.e. it is designed to store goods up to that height.
- the rack 10 consists of a metal (aluminium or iron) structure and has open shelves 16.
- the open shelves are covered by the stored material, which avoids water penetration from the top.
- the shelves 16 are arranged to offer a max. storage depth of 4.6 m, while maintaining a longitudinal flue 18 of no less than 0.2 m.
- the rack 10 can be provided with steel separation bars or other means to maintain the longitudinal flue.
- the rack is provided with solid vertical barriers 20, here 13 mm thick wood, that span over the rack's depth and storage height (i.e. up to the height of the products stored in the rack).
- the contours of the vertical barriers 20 are shown in dashed lines in Fig.2. These vertical barriers 20 help limiting the longitudinal propagation of the fire. They are longitudinally spaced and arranged transversely in the rack (thus parallel to one another). A desired number of vertical barriers 20 can be arranged in the rack, and this will typically depend on the rack's length. The maximum distance of 5.8 m (19 ft) between two consecutive vertical barriers is however to be respected.
- the term storage height designates the max. allowable height of the products stored on a rack (the rack height being slightly lower).
- the vertical barriers advantageously extend up to the storage height; therefore, the height of the rack, with the vertical barriers, is the same as the storage height.
- the sprinkler system is designed to operate with ceiling-level sprinklers only.
- the ceiling-level sprinklers indicated 22 in Fig.1 , have a standard thermal sensitivity, i.e. an RTI of 80 or greater and preferably a K-factor of at least 115 L/(min-bar % (may be above 160 (11 gpm/(psi) % ) or preferably above 260 (18.1 gpm/(psi) 1 /4)).
- the sprinklers 22 are of the pendent type, arranged at a distance between 7.5 and 30 cm (3" - 1 ft) from the ceiling 22 and here mounted on a same piping 24.
- the combined use of solid vertical barriers 20 in a high rise storage rack 10 with standard response sprinklers 22 permits to control a fire ignited in a rack section between two consecutive vertical barriers 20 for a period of time sufficient to allow fire fighters intervention.
- Example 1 No transverse flue spaces are required.
- FIG.3 A fire test using the above-described concept of ceiling-level sprinklers only and high rise storage racks with solid vertical barriers mounted on certain frames of the racks in order to limit the horizontal propagation of the fire was carried out.
- the test configuration is illustrated in Fig.3.
- the system comprises 20 sprinklers indicated S1 ...S20.
- Sprinklers indicated S5b, S10b, S15b and S20b are so-called target sprinklers.
- the double-row rack 50 has a length of 12 m. Each row (I and S) has width of 1.85 m and a longitudinal flue space of 600 mm is maintained by steel separation bars.
- the shelves are of the open type and there are 5 levels plus one on the floor.
- the height of the steel frames is 7 m, but it is loaded with goods up to a height of 8.5 m.
- Two vertical barriers 52 are arranged in the rack with a spacing of 5.8 m; they each have a height of 8.5 m and a width of the depth of the rack, here 4.3 m.
- the vertical barriers 52 are consist of B1 fire resistant wood panels of 14 mm (0.55 in) thickness.
- Nominal spacing for each sprinkler 9 m 2 (96.9 ft 2 ); Distance between deflectors and ceiling: 30 cm (11.81 in); Density: 56 mm/min (1.38 gpm/ft 2 ); Extinguishing agent: Water only.
- the goods in the storage rack 50 are on oversized wooden pallets of various dimensions and are comprised of candles and mattresses (simulated with sheets of polyurethane foam). There are also some dummies pallets in the rack, which are comprised of empty cardboard cartons.
- a square pool fire of 0.25 m 2 was used as ignition device.
- the pool fire was made in a steel plate having a height 50 mm and a thickness of 2 mm.
- the tray was first filled with water to a depth of 1 cm.
- the quantity of fuel used for the ignition was one liter of heptane poured on top of the water.
- the ignition point, indicated 54 in Fig.3, was located on the floor, between the two large pallets in the lower bay of rack I.
- Reference sign 56 indicates a target rack that was placed in front of the test rack 50 and loaded with dummy-goods, i.e. empty cartons on pallets. The cartons were placed on normal European wood pallets, and on each pallet the dummy-goods were wrapped with rolled plastic foil.
- the target rack 56 is a single row rack with the following characteristics: Length: 5.7 m; Width: 1.0 m; Height of the frame: 8 m; Levels of storage: 5 + one on the floor, like the test rack.
- test rack 50 and the target rack 56 rack are placed face to face, such that the pallets in the target rack are directly in front of the ignition point 54 in the test rack 50.
- the width of the aisle between the test and target rack is 3 m.
- Fig.4 is a graphic where temperatures of the section of a steel angle iron above the ignition point and the number of opened sprinklers are plotted versus time. Indeed, to monitor the temperature about the ignition point, a section of steel angle iron was mounted against the ceiling of the lower bay, above the ignition point. The section of steel angle iron was equipped with 3 thermocouples designated T1 , T2, and T3.
- the graphic of the steel angle iron temperature in Fig.4 shows that the sprinkler installation has reduced the power of the fire and controlled it during the 30 minutes of the test. Upon this 30 min of controlled fire, the fire was extinguished by fire fighters.
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- Engineering & Computer Science (AREA)
- Operations Research (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
LU91441A LU91441B1 (en) | 2008-05-19 | 2008-05-19 | Fire sprinkler system |
PCT/EP2009/056019 WO2009141316A1 (en) | 2008-05-19 | 2009-05-18 | Fire suprinkler system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2293852A1 true EP2293852A1 (en) | 2011-03-16 |
EP2293852B1 EP2293852B1 (en) | 2012-05-30 |
Family
ID=40121790
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09749806A Not-in-force EP2293852B1 (en) | 2008-05-19 | 2009-05-18 | Fire sprinkler system |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2293852B1 (en) |
LU (1) | LU91441B1 (en) |
WO (1) | WO2009141316A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2838817A4 (en) * | 2012-08-10 | 2015-12-16 | Reliable Auto Sprinkler Co | In-rack storage fire protection sprinkler system |
US11752382B2 (en) | 2018-05-21 | 2023-09-12 | Tyco Fire Products Lp | Systems and methods of real-time electronic fire sprinkler location and activation |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2013159063A2 (en) | 2012-04-20 | 2013-10-24 | Tyco Fire Products Lp | Dry sprinkler assemblies |
DE202014003113U1 (en) | 2014-04-10 | 2014-04-24 | Raumaster Paper Oy | Signaling system and vertical roller bearings |
US11007388B2 (en) | 2018-08-17 | 2021-05-18 | Viking Group, Inc. | Automatic fire sprinklers, systems and methods for suppression fire protection of high hazard commodities including commodities stored in rack arrangements beneath ceilings of up to fifty-five feet in height |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1931895A1 (en) * | 1969-06-24 | 1971-02-25 | Hoechst Ag | Shelf stack warehouse |
US3732930A (en) * | 1972-01-17 | 1973-05-15 | Ibm | Storage rack and sprinkler arrangement |
SU1087133A1 (en) * | 1982-08-05 | 1984-04-23 | Всесоюзный научно-исследовательский институт противопожарной обороны | Apparatus for putting out fires at storages having racks |
US5915479A (en) * | 1997-06-12 | 1999-06-29 | The Reliable Automatic Sprinkler | Velo sprinkler arrangement for protecting special occupancy hazards |
-
2008
- 2008-05-19 LU LU91441A patent/LU91441B1/en active
-
2009
- 2009-05-18 WO PCT/EP2009/056019 patent/WO2009141316A1/en active Application Filing
- 2009-05-18 EP EP09749806A patent/EP2293852B1/en not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2009141316A1 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2838817A4 (en) * | 2012-08-10 | 2015-12-16 | Reliable Auto Sprinkler Co | In-rack storage fire protection sprinkler system |
US11752382B2 (en) | 2018-05-21 | 2023-09-12 | Tyco Fire Products Lp | Systems and methods of real-time electronic fire sprinkler location and activation |
Also Published As
Publication number | Publication date |
---|---|
EP2293852B1 (en) | 2012-05-30 |
LU91441B1 (en) | 2009-11-20 |
WO2009141316A8 (en) | 2010-02-25 |
WO2009141316A1 (en) | 2009-11-26 |
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