valutazioni - 2, GPA: 3.5
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Facilità d'uso
Eff. TEFC 230/460 326TSC V18742SPE 108/54 124.8/62.4 422 1.15 94.1 F NOTES: . Locked rotor amps are for high voltage only. * Currently available on Packaged Hydrovar. • Motors are suitable for AQUAVAR® Variable Speed Drive. Above data is for Baldor® TC and TSC frame motors. Specifications subject to change without notice. PERFORMANCE WITH VARYING SPEED FOR CENTRIFUGAL PUMPS Fitting the electric pump with a variable speed drive makes it possible to vary the pump rotation speed, normally according to the system pressure parameter. Variations in electric pump speed result in modified performances according to the equivalence relations, called affinity laws. n1 = initial speed; n2= speed required. Q1 = initial flow rate; Q2= flow rate required. H1 = initial head; H2= head required. P1 = initial power; P2= power required Frequency ratios can be used instead of speed in practical applications, keeping 30 Hz as the bottom limit. Example : 2-pole 50 Hz electric pump n1 =2900 (point A) Flow rate (A) = 100 l/min; Head (A) = 50m By reducing the frequency to 30 Hz the speed is reduced to approx. n2 = 1740 rpm (point B) Flow rate (B) = 60 l/min; Head (B) = 18 m The power of the new work point B is cut to about 22% of the initial power. SIZING THE DIAPHRAGM TANK IN SYSTEMS WITH SPEED VARIATION Variable speed booster sets need smaller tanks compared to traditional systems. Generally speaking, a tank with a capacity of just 20% of the nominal capacity of a single pump, expressed in gallons per minute, is needed. The gradual starting of the pumps controlled by the drive reduces the need to limit the number of hourly starts; the main purpose of the tank is to compensate for small system losses, stabilize the pressure and make up for pressure variations caused by sudden demand (fast acting valves). Make the following calculation: Set made up of three electric pumps, each with a maximum flow rate of 100 GPM, for a total capacity of 300 GPM. The volume required for the tank is 20 gallons. This is total capacity, not drawdown. Mount downstream of the check valves in discharge manifold. Flow RateHeadPowerQ1=n1Q2n2H1=n1H2n22P1=n1P2n23Q1Q2QH1H2HFlowHeadn2n1AB VARIABLE SPEED PERFORMANCE CURVES 1SV VARIABLE SPEED CURVE SSVB 304SS Multi-Stage Pumps MODEL: 1SVB 6 Stage Hydraulic Data Maximum Flow Flow at Duty Point Maximum TDH TDH at Duty Point NPSHR 22 US GPM 298 feet 0123456789101112131415161718192021222324[US GPM] 00.40.81.21.6[HP] 01234567[FT] 04080120160200240280300[FT] Fluid: Water, pureDuty Chart: 3500 RPMHeadNPSH - valuesShaft power P2630 Hz40 Hz50 Hz60 HzApplication Range30 Hz40 Hz50 Hz60 Hz6 (P2) 30 Hz40 Hz50 Hz60 Hz0.20.611.42060100140180220260 VARIABLE SPEED PERFORMANCE CURVES 1SV VARIABLE SPEED CURVE SSVB 304SS Multi-Stage Pumps MODEL: 1SVB 9 Stage Hydraulic Data Maximum Flow Flow at Duty Point Maximum TDH TDH at Duty Point NPSHR 22 US GPM 442 feet 0123456789101112131415161718192021222324[US GPM] 00.40.81.21.622.4[HP] 01234567[FT] 04080120160200240280320360400440[FT] Fluid: Water, pureDuty Chart: 3500 RPMHeadNPSH - valuesShaft power P2944.5% 44.5% 44.5% 44.5% 30 Hz40 Hz50 Hz60 HzApplication Range30 Hz40 Hz50 Hz60 Hz9 (P2) 30 Hz40 Hz50 Hz60 Hz VARIABLE SPEED PERFORMANCE CURVES 1SV VARIABLE SPEED CURVE SSVB 304SS Multi-Stage Pumps MODEL: 1SVB 15 Stage Hydraulic Data Maximum Flow Flow at Duty Point Maximum TDH TDH at Duty Point NPSHR 22 US GPM 733 feet 0123456789101112131415161718192021222324[US GPM] 00.51.522.534[HP] 01234567[FT] 04080120160200240280320360400440[FT] Fluid: Water, pureDuty Chart: 3500 RPMHeadNPSH - valuesShaft power P21544.5% 44.5% 44.5% 44.5% 30 Hz40 Hz50 Hz60 HzApplication Range30 Hz40 Hz50 Hz60 Hz15 (P2) 30 Hz40 Hz50 Hz60 Hz13.5480520560600640680720760 VARIABLE SPEED PERFORMANCE CURVES 2SV VARIABLE SPEED CURVE SSVB 304SS Multi-Stage Pumps MODEL: 2SVB 5 Stage Hydraulic Data Maximum Flow Flow at Duty Point Maximum TDH TDH at Duty Point NPSHR 40 US GPM 217 feet 024681012141618202224[US GPM] 00.20.60.811.21.6[HP] 0246[FT] 0102030405060708090100110[FT] Fluid: Water, pureDuty Chart: 3500 RPMHeadNPSH - valuesShaft power P2557.1% 57.1% 57.1% 57.1% 30 Hz40 Hz50 Hz60 HzApplication Range30 Hz40 Hz50 Hz60 Hz5 (P2) 30 Hz40 Hz50 Hz60 Hz0.41.4120130140150160170180190262830323436384042810200210220 VARIABLE SPEED PERFORMANCE CURVES 2SV VARIABLE SPEED CURVE SSVB 304SS Multi-Stage Pumps MODEL: 2SVB 8 Stage Hydraulic Data Maximum Flow Flow at Duty Point Maximum TDH TDH at Duty Point NPSHR 40 US GPM 353 feet 024681012141618202224[US GPM] 00.81.21.6[HP] 0246[FT] 020406080100[FT] Fluid: Water, pureDuty Chart: 3500 RPMHeadNPSH - valuesShaft power P2857.1% 57.1% 57.1% 57.1% 30 Hz40 Hz50 Hz60 HzApplication Range30 Hz40 Hz50 Hz60 Hz5 (P2) 30 Hz40 Hz50 Hz60 Hz0.412014016018026283032343638404281020022022.4240260280300320340360 VARIABLE SPEED PERFORMANCE CURVES 2SV VARIABLE SPEED CURVE SSVB 304SS Multi-Stage Pumps MODEL: 2SVB 13 Stage Hydraulic Data Maximum Flow Flow at Duty Point Maximum TDH TDH at Duty Point NPSHR 40 US GPM 586 feet ...
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