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Residential Sprinklers Tyco Fire Products
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Residential Sprinklers,Used In NFPA 13 2002 Applications. BACKGROUND 4,WHAT THE INDUSTRY HAS DONE 5,OPTIMUM PERFORMANCE MIXING ORIFICE SIZE 13. CONCLUSION 17,APPENDIX A 18,ABOUT THE AUTHOR 26,MIN RESIDENTIAL LISTED FLOW. TABLE 3 LFII TY2234 K4 2 PENDENT RECESSED PENDENT 9. TABLE 4 LFII TY4234 K6 9 PENDENT RECESSED PENDENT 9. THE GREATER OF LISTING VS S X L MIN FLOW, TABLE 5 LFII TY2234 K4 9 PENDENT RECESSED PENDENT 10. TABLE 6 LFII TY4234 K6 9 PENDENT RECESSED PENDENT 11. TABLE 9 LFII TY2596 K4 2 FLAT PLATE CONCEALED 18, TABLE 11 LFII TY2234 K4 9 DOMED PLATE CONCEALED 19.
TABLE 13 LFII TY4234 K6 9 DOMED PLATE CONCEALED 20. TABLE 15 LFII TY2284 K4 2 FLUSH PENDENT 21,TABLE 17 LFII TY2384 K4 2 FLUSH SIDEWALL 22. TABLE 19 LFII TY1334 K4 2 SIDEWALL 23,TABLE 21 LFII TY3334 K5 6 SIDEWALL 24. MIN PRESSURE IN PSI, TABLE 7 LFII TY2234 K4 9 PENDENT RECESSED PENDENT 12. TABLE 8 LFII TY4234 K6 9 PENDENT RECESSED PENDENT 12. TABLE 10 LFII TY2596 K4 2 FLAT PLATE CONCEALED 18, TABLE 12 LFII TY2234 K4 9 DOMED PLATE CONCEALED 19. TABLE 14 LFII TY4234 K6 9 DOMED PLATE CONCEALED 20. TABLE 16 LFII TY2284 K4 2 FLUSH PENDENT 21,TABLE 18 LFII TY2384 K4 2 FLUSH SIDEWALL 22.
TABLE 20 LFII TY1334 K4 2 SIDEWALL 23,TABLE 22 LFII TY3334 K5 6 SIDEWALL 24. Residential Sprinklers,Used In NFPA 13 2002 Applications. Background, Recent changes to the National Fire Protection Association NFPA Standard 13 Installation of. Sprinkler Systems and revisions to Underwriters Laboratory Inc UL Standard 1626 Standard for. Residential Sprinklers for Fire Protection Service have prompted the largest revision to residential. sprinklers since the early 1980 s A previous technical analysis titled Residential Sprinklers A. Technical Analysis of Listings and Applications explained the recent changes in residential. Listings that were required to comply with new 0 05 minimum density gpm ft2 specified by NFPA. 13D and 13R The 0 05 minimum densities had an immediate effect on manufacturer s listings. since UL Standard 1626 was modified to require the new minimum density before the 2002 NFPA. Standards had been adopted by most building codes Now that the 2002 editions are fast becoming. adopted and enforceable standards confusion has arisen regarding the 0 1 minimum density. gpm ft2 requirement for residential sprinklers used in NFPA 13 occupancies This document. provides an overview of the criteria and the options for residential sprinkler. selection to optimize both performance and economics of installation. NFPA 13 recognized the use of residential sprinklers in residential portions of NFPA 13. occupancies in 1983 An increased dependence on the performance of residential sprinklers was. expected including the protection of property in addition to their life safety feature With the. debate that sparked the new minimum 0 05 minimum density in NFPA 13D and 13R serious. discussions took place in the fire protection technical community regarding the intent of. residential sprinklers and the application of these life safety devices in a life property protection. standard NFPA 13 Prior to residential sprinklers NFPA 13 required either pipe schedule systems. or hydraulically calculated systems for Light Hazard Occupancies to be designed to provide from a. 0 07 gpm sq ft over a minimum 3000 sq ft to a 0 1 gpm sq ft over a minimum 1500 sq ft It was. also understood that sprinklers protecting any area smaller than 1500 sq ft would also discharge a. minimum 0 1 gpm sq ft Residential sprinklers were allowed in NFPA 13 occupancies in 1983 to. protect residential portions of these occupancies with only a 4 sprinkler design Manufacturer s. were successful in obtaining densities as low as 0 03 gpm sq ft for residential sprinkler listings. This was not acceptable to the technical committee for the protection of NFPA 13 occupancies. especially since NFPA 13 requirements for residential occupancies generally involve buildings over. 4 stories in height 13R applies to 4 stories or less or hospital nursing homes. Residential Sprinklers,Used In NFPA 13 2002 Applications. What the industry has done, There is no question as to the 20 year performance of residential sprinklers the record is.
tremendously successful With all of the other considerations allowed in the codes for the. installation of an automatic sprinkler system came the question is the residential minimum. density adequate for larger occupancies Accordingly two significant changes were made in the. NFPA standards first 13D and 13R were changed to require a minimum density of 0 05 gpm sq ft. this means no lower than 0 05 higher densities are allowed and second NFPA 13 adopted. section 11 2 3 5 2 which states, 11 2 3 5 2 Unless the requirements of 11 2 3 5 3 are met the minimum required. discharge from each of the four hydraulically most demanding sprinklers shall be the. greater of the following, 1 In accordance with minimum flow rates indicated in individual listings. 2 Calculated based on delivering a minimum of 0 1 gpm ft2 4 1 mm min over the. design area in accordance with the provisions of 8 5 2 1. This section has caused some confusion within the industry and a breakdown of the. requirements is in order There are two density rules here The key to understanding the difference. is in the first sentence that states the minimum required discharge from each of the four. hydraulically most demanding sprinklers shall be the greater emphasis added of the. following So what makes one greater than the other A more detailed understanding of the. hydraulic calculation rules for residential sprinklers is necessary. Item 1 In accordance with minimum flow rates indicated in individual listings requires. that the minimum flow cannot be less than the Listing for the individual sprinkler It is very. important to understand that residential sprinklers are listed in intervals of maximum spacing For. example a residential pendent sprinkler listed for a 20 x 20 ft spacing at a discharge of 20 gpm. 0 05 minimum density x 400 sq ft requires the same minimum discharge if the actual spacing is. 20 x 12 ft The principle is that there is a minimum pressure required to throw water in the. maximum direction therefore the maximum dimension 20 ft dictates the minimum flow. regardless of the smaller dimension Extended coverage Light and Ordinary Hazard upright and. pendent sprinklers are designed to the same concept the larger dimension is squared to obtain. the minimum discharge Sidewall residential sprinklers are listed in 2 ft increments but again. the maximum dimension dictates the minimum flow See the manufactures listing information for. minimum flows to obtain the value of this item 1 Fire testing and certification testing are. performed to validate these minimum flows, Item 2 Calculated based on delivering a minimum of 0 1 gpm ft2 4 1 mm min over the. design area in accordance with the provisions of 8 5 2 1 is a new twist to the application of. residential sprinklers We first have to see the reference to section 8 5 2 1 to understand this new rule. 8 5 2 1 Determination of the Protection Area of Coverage. 8 5 2 1 1 The protection area of coverage per sprinkler As shall be determined as follows. Residential Sprinklers,Used In NFPA 13 2002 Applications. 1 Along branch lines as follows, a Determine distance between sprinklers or to wall or obstruction in the case of.
the end sprinkler on the branch line upstream and downstream. b Choose the larger of either twice the distance to the wall or the distance to the. next sprinkler,c This dimension will be defined as S. 2 Between branch lines as follows, a Determine perpendicular distance to the sprinkler on the adjacent branch line or. to a wall or obstruction in the case of the last branch line on each side of the. branch line on which the subject sprinkler is positioned. b Choose the larger of either twice the distance to the wall or obstruction or the. distance to the next sprinkler,c This dimension will be defined as L. 8 5 2 1 2 The protection area of coverage of the sprinkler As shall be established by. multiplying the S dimension by the L dimension as follows As S x L. See Figure 1 for an example of S x L spacing, People experienced in the application of NFPA 13 refer to this rule as the S x L rule This rule. differs from extended coverage rules or the previous application of residential sprinklers no. longer does the maximum dimension govern the minimum discharge Keep in mind however. that we are looking for the greater of 1 or 2 With this in mind our previous example of a. pendent residential sprinkler listed at a minimum 20 gpm for 20 x 20 ft coverage does not default. to 40 gpm 400 sq ft x 0 1 gpm sq ft density if one dimension of the spacing is 20 ft as the S x L. rule for the application will now take precedence The example referenced of 20 x 12 ft 20 x 12. 240 sq ft x 0 1 gpm sq ft 24 gpm coverage would require 24 gpm minimum Comparing 1 20. gpm the Listing and 2 24 gpm the S x L rule the minimum discharge to be calculated for the. 4 sprinkler minimum would be 24 gpm the greater number of 1 and 2. It seems against the logic that the sprinkler now knows the difference between a 20 x 20 ft. room and a 20 x 12 ft room however keep in mind that there is a safety net at the minimum. performance Item 1 will not let the minimum discharge fall below its listed minimum for the. maximum room spacing dimension The following examples further clarify the application. 1 An example of this would be a residential sprinkler in an NFPA 13 application spaced at. 14 x 17 ft Table 1 238 sq ft The 0 1 calculation would be based on 238 sq ft x 0 1 gpm 23 8. gpm Table 2 the Listed minimum flow for 18 x 18 17 ft rounded up to the next 2 ft. interval 18 ft may be 17gpm depending on model and Listing The greater flow is 23 8 gpm. and per the new rules 23 8 gpm is the minimum flow allowed for the 4 head calculation. Residential Sprinklers,Used In NFPA 13 2002 Applications.
2 An example in the other direction is a spacing of 8 x 20 Table 1 160 sq ft The 0 1. calculation would be based on 160 sq ft x 0 1 gpm 16 gpm Table 2 the Listed. residential flow may be 20 gpm the flow for 20 x 20 spacing The greater flow is 20 gpm. the residential flow so 20 gpm is the minimum flow for the 4 head calculation. The lesson of the minimum flow is the greater of the S x L rule or the minimum Listed. residential flow, The S x L rule for square footage can be summarized by the Table 1 The result is the square. foot coverage of the sprinkler Using the chart spacing top row S and the vertical column L. S x L the square footage The actual spacing dimensions do not have to be rounded in the S x L. calculation 18 4 1 2 x 10 0 would be 184 sq ft See Figure 1 for further clarification of S x L. Figure 1 Spacing Rules Example for S x L and Residential. Residential Sprinklers,Used In NFPA 13 2002 Applications. Spacing sq ft SxL rule,Spacing ft 8 9 10 11 12 13 14 15 16 17 18 19 20. 8 64 72 80 88 96 104 112 120 128 136 144 152 160,9 72 81 90 99 108 117 126 135 144 153 162 171 180. 10 80 90 100 110 120 130 140 150 160 170 180 190 200. 11 88 99 110 121 132 143 154 165 176 187 198 209 220. 12 96 108 120 132 144 156 168 180 192 204 216 228 240. 13 104 117 130 143 156 169 182 195 208 221 234 247 260. 14 112 126 140 154 168 182 196 210 224 238 252 266 280. 15 120 135 150 165 180 195 210 225 240 255 270 285 300. 16 128 144 160 176 192 208 224 240 256 272 288 304 320. 17 136 153 170 187 204 221 238 255 272 289 306 323 340. 18 144 162 180 198 216 234 252 270 288 306 324 342 360. 19 152 171 190 209 228 247 266 285 304 323 342 361 380. 20 160 180 200 220 240 260 280 300 320 340 360 380 400. Table 1 S x L Spacing Square Footage, The formula to establish the minimum flow for the S x L rule can be summarized as follows.
S x L x 0 1 density Minimum GPM, Table 2 gives minimum flow examples of even one foot intervals in spacing however actual. spacing should be used for minimum flow calculations. Minimum NFPA 13 Flow for Residential Sprinklers gpm based on S x L x 0 1 gpm sq ft. Spacing ft 8 9 10 11 12 13 14 15 16 17 18 19 20, 8 6 4 7 2 8 0 8 8 9 6 10 4 11 2 12 0 12 8 13 6 14 4 15 2 16 0. 9 7 2 8 1 9 0 9 9 10 8 11 7 12 6 13 5 14 4 15 3 16 2 17 1 18 0. 10 8 0 9 0 10 0 11 0 12 0 13 0 14 0 15 0 16 0 17 0 18 0 19 0 20 0. 11 8 8 9 9 11 0 12 1 13 2 14 3 15 4 16 5 17 6 18 7 19 8 20 9 22 0. 12 9 6 10 8 12 0 13 2 14 4 15 6 16 8 18 0 19 2 20 4 21 6 22 8 24 0. 13 10 4 11 7 13 0 14 3 15 6 16 9 18 2 19 5 20 8 22 1 23 4 24 7 26 0. 14 11 2 12 6 14 0 15 4 16 8 18 2 19 6 21 0 22 4 23 8 25 2 26 6 28 0. 15 12 0 13 5 15 0 16 5 18 0 19 5 21 0 22 5 24 0 25 5 27 0 28 5 30 0. 16 12 8 14 4 16 0 17 6 19 2 20 8 22 4 24 0 25 6 27 2 28 8 30 4 32 0. 17 13 6 15 3 17 0 18 7 20 4 22 1 23 8 25 5 27 2 28 9 30 6 32 3 34 0. 18 14 4 16 2 18 0 19 8 21 6 23 4 25 2 27 0 28 8 30 6 32 4 34 2 36 0. 19 15 2 17 1 19 0 20 9 22 8 24 7 26 6 28 5 30 4 32 3 34 2 36 1 38 0. 20 16 0 18 0 20 0 22 0 24 0 26 0 28 0 30 0 32 0 34 0 36 0 38 0 40 0. Table 2 Minimum Flow 0 1 Density Based on S x L Spacing GPM. Caution Table 2 shows minimum flow for even 1 ft intervals always use actual spacing for S x L. Residential Sprinklers,Used In NFPA 13 2002 Applications. With the minimum flow established for the S x L rule the Listed residential minimum flow. needs to checked against the minimum S x L flow No calculation is necessary for establishing this. Prior to residential sprinklers NFPA 13 required either pipe schedule systems or hydraulically calculated systems for Light Hazard Occupancies to be designed to provide from a 0 07 gpm sq ft over a minimum 3000 sq ft to a 0 1 gpm sq ft over a minimum 1500 sq ft It was also understood that sprinklers protecting any area smaller than 1500 sq ft would also discharge a minimum 0 1 gpm sq ft

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