valutazioni - 2, GPA: 3
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3. The factory pre-charge setting is 25 PSIG and should only be adjusted at the time of the installation. 4. System velocity shall not exceed 22 fps. TYPICAL INSTALLATIONPUMPCHECK VALVETO SYSTEMSURGE-TROL Diagram 1 SIZING THE SURGE-TROL™ Precise Sizing For Pump Shut-down: Precise Sizing For Pump Start-up: Volume of Tank in Gallons = Vv AF AF - Acceptance Factor = 1 - ( P1 + 14.7)1/n P2 + 14.7 Vv - Vacuum Volume = Qss x Tc x 7.481 Tc - Critical Time in seconds = 2L a Volume of Tank in Cubic Feet = ( SG x 2 x Qs x L ) ( P2 + 14.7 )1/n 449a P1 + 14.7 ( P2 + 14.7 )1/n P1 + 14.7 -1 NOTE: Set pre-charge pressure 15% below static pressure. NOTE: To convert cubic feet to gallons multiply by 7.481. NOTE: Set pre-charge pressure 50% below static pressure. Precise Sizing Example For Pump Shut-down Based On: Use: Pump = 100 GPM Pipe = 2” Steel Pipe; 1000 ft of pipe Static Pressure = 100 psig Max. Pressure = 150 psig Pre-charge Gas = Dry Air Tc = 2L = 2(1000) = 2000 = .444 a 4500 4500 Vv = Qss x Tc x 7.481 = 9.5 x .444 x 7.481 = 31.55 AF = 1 - ( P1 + 14.7)1/n = 1 - ( 64.7 )1/1.2 = .54 P2 + 14.7 164.7 Volume of Tank in Gallons = Vv = 31.55 = 58.4 AF .54 Recommendation = SPT-11 SG = Specific gravity of fluid: Water 1 Ethylene glycol 1.1 Propylene glycol 1.1 Glycerin 1.3 Qs = Fire pump flow rate in gpm Qss = Fire pump flow rate in feet per second L = Length of pipe in feet a = Speed of pressure wave in feet per second: Steel pipe 4500 ft/sec Cast iron = 4500 ft/sec Ductile iron 4500 ft/sec PVC pipe = 1250 ft/sec P2 = Maximum allowable pressure P1 = Tank pre-charge pressure setting n = Gas constant (pre-charge gas) dry air 1.2 nitrogen 1.4 A = Area of Pipe - pipe size V = Velocity of water in feet per second Description Standard Construction Shell Steel Bladder Heavy Duty Butyl NSF/ANSI 61 Bladder Thickness .100 Minimum System Connection Steel - ANSI Flange Coating Red Oxide Primer Factory Precharge 25 PSIG (1.7 bar) Tank A B Sys. C D E Ship Vol. Height Diameter Conn. Conn. Conn. Stand Wt. Model Inset CtrLine Dia No. Lit. Gal mm ins. mm ins. ins. ins. ins. ins. kg lbs. SPT-7 200 53 1245 487/8 610 24 4 19/16 83/16 19 166 367 SPT-11 300 80 1600 627/8 610 24 4 19/16 83/16 19 208 459 SPT-14 400 106 1956 767/8 610 24 4 19/16 83/16 19 282 618 SPT-18 500 132 2311 907/8 610 24 4 19/16 83/16 19 333 731 SPT-21 600 158 1893 7411/16 762 30 4 13/8 71/4 24 433 950 SPT-28 800 211 2365 931/8 762 30 4 13/8 71/4 24 513 1125 SPT-35 1000 264 2086 821/8 914 36 6 31/4 71/2 30 693 1520 SPT-42 1200 317 2465 941/2 914 36 6 31/4 71/2 30 784 1720 SPT-50 1400 370 2781 1091/2 914 36 6 31/4 71/2 30 866 1900 SPT-56 1600 422 2178 853/4 1220 48 8 13/4 107/8 42 1049 2300 SPT-70 2000 528 2528 995/8 1220 48 8 13/4 107/8 42 1231 2700 AMTROL INC. LIMITED PRODUCT WARRANTY Products covered: all Products manufactured by AMTROL Inc. (“AMTROL”). This warranty cannot be transferred – it is extended only to the original Purchaser or First User of the Product. By accepting and keeping this Product you agree ...
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