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HomeMy WebLinkAboutFire Flow ReportSTEPHEN C. BEACHY CENTRAL PARK IMPROVEMENTS CITY OF COLLEGE STATION JC JOB # C0088-001 FIRE FLOW REPORT EXISTING WATER SYSTEM SUMMARY &I- U The subject development is located between Krenek Tap Road, Central Park kade and the West Highway 6 Frontage Road in College Station, Texas. Currently, an 8" CoCS waterline is located along the southeasterly side of and running parallel to Krenek Tap Road. This existing 8" waterline connects to a 12" CoCS waterline located at the corner of Krenek Tap Road and the West Highway 6 Frontage Road. A 6" CoCS waterline tees off of the 8" waterline at the intersection of Central Park Lane and Krenek Tap Road. This 6" waterline extends into the Central Park complex approximately 500 LF to a fire hydrant assembly at the intersection of Recreation Drive and Central Park Lane. PROPOSED WATER SYSTEM IMPROVEMENTS The proposed water system improvements for the subject development include approximately 400 LF of 6" AWWA C900 Class 200 PVC waterline installed under Central Park Drive and softball field #3, with one (1) new fire hydrant and associated appurtenances. These water system improvements will extend fire flow service from the existing fire hydrant and 6" waterline at the intersection of Recreation Drive and Central Park Drive to the proposed concession building at the softball field complex. The proposed concession building will be equipped with an automatic fire sprinkler system. The implementation of this automatic fire sprinkler system will be factored into the required fire flow demand. REQUIRED FLOW Building Type = V-B (Section 602 and 1505 of 2006International Building Code) Fire Area= 2,600 square feet (Section Bt04 of 2006International Fire Code) Required Fire Flow = 1,500gpm (Table BIOS. I of 2006International Fire Code) 50% reduction allowed for sprinkled buildings = 1,500 gpm x 50% = 750 gpm (Section B 105.2 of 2006 International Fire Code (75%); Local Fire Marshall {50%)) Number of hydrants required = 1 (Table C 105.1 of 2006International Fire Code) CALCULATED SYSTEM CAPACITY Calculated fire flow capacity at hydrant F-006 with 20-psi residual pressure at hydrant F-007 is determined by: Q,, = 29.83cdD2 PP Q,, = (29.83)(0.9)(2.5)2 57 =1,267 gpm Central Park Improvements: Fire Flow Report January 4, 2011 Page 1 of 2 0.54 P —20 s f P,—i;. Q f = (1,267)108 — 20o.sa — 2,615 gpm (108-85) Where: Q,. = residual flow at the pitot pressure (gpm) Q f = Fire Flow (gpm) cs = friction loss (usually 0.9 for smooth 2.5-in opening) D = diameter of opening in inches (2.5 in most cases) PP = pilot pressure (psig) P,. = residual pressure (psig) PS = static pressure (psig) ANALYSIS For proposes of hydraulic analysis of the proposed improvements, WaterCAD by Haestad Methods was used for the water system model. To properly calibrate the water system model, fire hydrant flow tests were requested and obtained from CoCS Utilities for the existing hydrant on Central Park Lane (F-006) (see attached flow report). Using this data for flow, static and residual pressures, a water system model was created and calibrated for this small portion of the existing water system. The proposed improvements of approximately 400 LF of 6" AWWA C900 Class 200 PVC waterline with one (1) new fire hydrant and associated appurtenances were added to the water model and then analyzed the fire flow scenario for minimum pressure and maximum velocities in the system. RESULTS To analyze the CoCS minimum required fire flow of 750 gpm, the WaterCAD model was performed with a fire flow scenario of 750 gpm (fire flow scenario #1) from the proposed hydrant (FH-1). Fire flow scenario # 1 resulted in a minimum node pressure of 87.94 psig and a maximum pipe velocity of 8.51 ft/s. The proposed water system improvements and existing infrastructure, under the fire flow scenario described above, was determined to adequately meet or positively exceed the minimum B/CS design standards. Central Park Improvements: Fire Flow Report January 4, 2011 Page 2 of 2 STEPHEN C. BEACHY CENTRAL PARK IMPROVEMENTS JC JOB No. C0088-001 WATERCAD MODEL OUTPUT DATA SUMMARY FIRE FLOW SCENARIO #1 Node Label Elevation (ft) Demand Type Demand (gpm) Demand Pattern Calculated Demand (gpm) Hydraulic Grade (ft) Pressure (psi) FH-1 270.00 Demand 750.00 Fixed 750.00 473.37 87.94 F-006 270.00 Demand 0.00 Fixed 0.00 487.05 93.86 J-1 270.00 Demand 0.00 Fixed 0.00 500.50 99.68 F-007 270.00 Demand 0.00 Fixed 0.00 500.50 99.68 Pipe Length Diameter Discharge Headloss Velocity Label (ft) (in) Material Roughness (gpm) (ft) (ft/s) P-14 550.00 6.00 PVC 150.00 750.00 18.50 8.51 P-2 407.00 6.00 PVC 150.00 750.00 13.69 8.51 P-15 400.00 6.00 PVC 150.00 750.00 13.45 8.51 P-16 650.00 6.00 PVC 150.00 0.00 0.00 0.00 Central Park Water Model Output.xls f +� Ile Station Utilities Reliable, Affordable, Community Owned Date Thursday, July 1, 2010 Time 9:00 A.M. Test completed by Justin Tamplin Witness Wyatt Jefferson Location Central Park Nozzle size 2.5 Flow hydrant F-006 Pitot reading 57 G.P.M. 1275 Static hydrant F-007 Static PSI 108 Residual PSI 85 Comments APPENDIX B TABLE 8105.1 MINIMUM REQUIRED FIRE -FLOW AND FLOW DURATION FOR BUILDINGS' FIRE -FLOW CALCULATION AREA (square teat) Flfl per min (gallons per minute)° FLOW DURATION (hours) Type IA and IB° Type IIA and IIIA°r8,201-10,900 IV and V-AI' Type IIB and 1118° Type V-B° 0-22,700 0-12,700-8,200 0-5,900 0-3,600 1,500 22,701-30,200 12,701-17,000 5,901-7,900 3,601-4,800 1,750 30,201-38,700 17,001-21,80001-12,900 7,901-9,800 4,801-6,200 2,000 38,701-48,300 21,801-24,20001-17,400 9,801-12,600 6,201-7,700 2,250 2 48,301-59,000 24,201-33,200 17,401-21,300 12,601-15,400 7,701-9,400 2,500 59,001-70,900 33,201-39,700 21,301-25,500 15,401-18,400 9,401-11,300 2,750 70,901-83,700 39,701-47,100 25,501-30,100 18,401-21,800 11,301-13,400 3,000 83,701-97,700 47,101-54,900 30,101-35,200 21,801-25,900 13,401-15,600 3,250 97,701-112,700 54,901-63,400 35,201-40,600 25,901-29,300 15,601-18,000 3,500 3 112,701-128,700 63,40IM,400 40,601-46,400 29,301-33,500 18,001-20,600 3,750 128,701-145,900 72,401-82,100 46,401-52,500 33,501-37,900 20,601-23,300 4,000 145,901-164,200 82,101-92,400 52,501.59.100 37,901-42,700 23,301-26,300 4,250 164,201-183,400 92,401-103,100 59,101.66,000 42,701-47,700 26,301-29,300 4,500 183,401-203,700 103,101-114,600 66,001-73,300 47,701-53,000 29,301-32,600 4,750 203,701-225,200 114,601-126,700 73,301-81,100 53,001-58,600 32,601-36,000 5,000 225,201-247,700 126,701-139,400 81,101-89,200 58,601-65,400 36,001-39,600 5,250 247,701-271,200 139,401-152,600 89,201.97,700 65,401-70,600 3901-43,400 5,500 271,201-295,900 152,601-166,500 97,701-106,500 70,601-77,000 43,401-47,400 5,750 295,901-Greater 166,501-Greater 106,501-115,800 77,001-83,700 47,401-51,500 6,000 4 - - 115,801-125,500 83,701-90,600 51,501-55,700 6,250 - - 125,501-135,500 90,601-97,900 55,701-60,200 6,500 - - 135,501-145,800 97,901-106,800 60,201-64,800 6,750 - - 145,801-156,700 106,801-113,200 64,801-69,600 7,000 - - 156,701-167,900 113,201-121,300 69,601-74,600 7,250 - - 167,901-179,400 121,301-129,600 74,601-79,800 7,500 - - 179,401-191,400 129,601-138,300 79,801-85,100 7,750 - - 191,401-Greater 138,301-Greater 85,101-Greater 8,000 Fox SI: 1 square foot = 0.0929 ms, 1 gallon per minute =3.785 Ltm,1 pound per square inch - 6.895kFa, a, The minimum required fire flow shall be allowed to be reduced by 25 percent for Group R. b. Types of construetlou are based on theintenmtional Building Code. a. Measuredm20 psi. 394 2006 INTERNATIONAL FIRE CODE® APPENDIX C FIRE HYDRANT LOCATIONS AND DISTRIBUTION The provisions container) in this appendix are not mandatory unless specifically referenced in the adopting ordinance. SECTION C101 GENERAL C101.1 Scope, Fire hydrants shall be provided in accordance with this appendix for the protection of buildings, or portions of buildings, hereafter constructed. SECTION C102 LOCATION C102.1 Fire hydrant locations. Fire hydrants shall be pro- vided along required fire apparatus access roads and adjacent public streets. SECTION C103 NUMBER OF FIRE HYDRANTS SECTION C104 CONSIDERATION OF EXISTING FIRE HYDRANTS C104.1 Existing fire hydrants. Existing fire hydrants on pub- lic streets are allowed to be considered as available. Existing fire hydrants on adjacent properties shall not be considered available unless fire apparatus access roads extend between properties and easements are established to prevent obstruction of such roads. SECTION C105 DISTRIBUTION OF FIRE HYDRANTS C105,1 Hydrant spacing. The average spacing between fire hydrants shall not exceed that listed in Table C105.1. C103.1Firehydrantsavailable. Theminimumnumber offire Exception: The fire chief is authorized to accept a deft - hydrants available to a building shall notbe less than thatlisted ciencyofuptolOpercentwhereexisting fire, hydrants pro - in Table C105.1. The number of fire hydrants available to a vide all or a portion of the required fire hydrant service. complex or subdivision shall not be less than that determined by spacing requirements listed in Table C105.1 when applied Regardless of the average spacing, fire hydrants shall be. to fire apparatus access roads and perimeterpublic streets from located such that all points on streets and access roads adjacent which fire operations could be conducted. to abuilding are within the distances listed in Table C105.1. TABLE C105.1 NUMBER AND DISTRIBUTION OF FIRE HYORANTR FIRE -FLOW REQUIREMENT (gpm) MINIMUM NUMBER OFHYDRANTS AVERAGE SPACING BETWEEN HYDRANTS.,b,° (feet) MAXIMUM DISTANCE FROM ANY POINT ON STREET OR ROAD FRONTAGE TO A HYDRANTa 1,750 or less 1 500 250 2,000-2,250 2 450 225 2,500 3 450 225 3,000 3 400 225 3,500-4,000 4 350 210 4,500-5,000 5 300 180 5,500 6 300 180 6,000 6 250 150 6,500-7,000 7 250 150 7,500 or more 8 or more` 200 120 Forst: 1 foot= 304.8 mm, 1 gallon per minute = 3.785 Um. a. Reduce by 100 feetfor dead-end streets or roads. b. Where streets me provided with median dividers which can be crossed by fire I! traffic lanes and have a traffic count of more then 30,000 vehicles perdag hydra alternating basis up to a fire -flow requirement of 7,000 gallons perminum and c. Where new watermains are extended along streets where hydrants arenotneedi vided at spacing not to exceed 1,000 feet to provide for transportation hazards. d. Reduce by 50 feet for dead-end streets or roads, a. One hydrant for each 1,000 gallons per minute or fraction thereof. or where ancrial streets me provided with four or more ;00feet on each side of the street andbe arranged on an problems, fire hydrants shall be pro- 2006 INTERNATIONAL FIRE CODE® - 395 M2 A \ rimy>�Up ss� "d �Nw sd G z= CHAINLINK FEW 3n — an -- 3n �WyGmOOd m�; m� oa 3n _� o 111111111 MENE■■■MEN ■■�■■■ MEMO I■■■■ ,� �MmMm MmENEM■■■��� ■■E■OEM�11 ME■■E■ME ■■■�11 No no 0 ■■■■�0■MNo ■I�E M ■■■■■IMINIIIIIIIIIIIIIIII MMMMMMMMMMM MMMMOSENNIIN MEMMEMM ■II■ MMMMMM■_■_Ell M E■■M■ummmII■ M■M■MMMM■�I I■ ME■EMM1111M■111■ Iii mMMMMIIMl ■M■■■■MMMIIIE ■■■■■■■milim ■■■■EIll11'IC moomEIll1EE� ■■■MMLJi■I IE MEMEME`■!! I■ I -IM ■■■■E■■■■, ©W■LI� SEE CURB ENDING OEIAA. 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