Centrifugal Pump Selection and Sizing - Calgary Pump Symposium ...

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Equations & Correlations • Head, H = 2.31 x dP / SG , (ft, psi) • Sp Speed, Ns = N x Q^1/2 / H^3/4 , (rpm, gpm, ft) • Suc Sp Speed, Nss = N x Q^1/2 / NPSHr^3/4 , (rpm, gpm, ft) • Head Coefficient, HC = H / (u^2 / 2g) , (ft, ft/s, ft/s^2) - methodology in “The Pump Handbook”, • Tip Speed, u = (H x 2g / HC)^0.5 , (ft/s, ft, ft/s^2) • Diameter, D = u x 12 / PI / (RPM/60) , (in, ft/s, rpm) • Power, P = H x Q x SG / (3960 x n) , (hp, ft, gpm) • From Curves: efficiency, expected nozzle size, min flow 34
Estimating the Head Coefficient • using the correlations in “The Pump Handbook”, 2 nd edition, Karassik, et al, Ch 2.1 Head Coefficient 1.40 1.20 1.00 0.80 Head Coefficient vs Specific Speed 0 500 1000 1500 2000 2500 Ns (rpm, gpm, ft) 1600 m3/h 800 m3/h 400 m3/h 200 m3/h 100 m3/h 50 m3/h 35
Page 1 and 2: Centrifugal Pump Selection and Sizi
Page 3 and 4: Pump types - Vertical In-line Pump
Page 5 and 6: Pump types - Between-Bearing Pump (
Page 7 and 8: Pump Selection - Old School 7
Page 9 and 10: The Goal • We want to select and
Page 11 and 12: Pump Selection - order of preferenc
Page 13 and 14: Relative Costs - example 1 • 200
Page 15 and 16: Relative Costs - example 3 • 200
Page 17 and 18: Overhung Pumps - Typical Coverage P
Page 19 and 20: VIL Pumps - Typical Limits • Tip
Page 21 and 22: VIL Pumps: Rigidly-coupled (OH4) ty
Page 23: Specific Speed (Ns) - a ‘dimensio
Page 26 and 27: Suction Specific Speed (Nss) - a
Page 28 and 29: Minimum Flow • Minimum flow issue
Page 30 and 31: Limited Range at Higher Nss Suction
Page 32 and 33: Head ( ft) 500 450 400 350 300 250
Page 36 and 37: Required Information • Require th
Page 38 and 39: Typical Casing Sizes Pump Speed Q (
Page 41 and 42: Worked Example: H= 500 ft, Q= 4500
Page 43: Overhung Pumps - Typical Coverage P
Page 46: Worked Example: H= 380 ft, Q= 1750
Page 49 and 50: Buying Pumps - Marrying the Hydraul
Page 51 and 52: Pump Standards - Applicability VIL
Page 53 and 54: General Info - ANSI/ASME B73 pumps
Page 55 and 56: What type of plant? • Class of Pl

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