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Common Pump Formula Common Pump Formula Product Viscosity where: = Kinematic viscosity (mm2/s) = Absolute viscosity (mPas) = fluid density (kg/m3) Or where: = Kinematic viscosity (cSt) = Absolute viscosity (cP) SG = specific gravity Or where: 1 poise = 100 cP 1 stoke = 100 cSt Flow Velocity where: V = fluid velocity (m/s) 3 Q = capacity (m /s) A = tube area (m2) Or where: V = fluid velocity (m/s) 3 Q = capacity (m /h) D = tube diameter (mm) Or where: V = fluid velocity (ft/s) Q = capacity (US gal/min) D = tube diameter (in) Reynolds Number where: (ratio of inertia forces to viscous D = tube diameter (m) forces) V = fluid velocity (m/s) = density (kg/m3) = Absolute viscosity (Pas) Or D = tube diameter (mm) V = fluid velocity (m/s) 3 = density (kg/m ) = Absolute viscosity (cP) Greensboro Division / Corporate Headquarters Louisville Division Nashville Division 301 Citation Court 4400 Bishop Lane, Suite 112 334 Free Hill Road, Suite B Greensboro, NC 27409 Louisville, KY 40218 Hendersonville, TN 37075 Phone: 336.393.0100 / 800.334.0231 Phone: 502.459.7475 / 800.459.7475 Phone: 615.822.3030 / 855.749.4820 Fax: 336.393.0140 Fax: 502.459.7633 Fax: 615.822.3031 www.mgnewell.com [email protected] [email protected] Or where: D = tube diameter (mm) Q = capacity (l/min) = Absolute viscosity (cP) Or where: D = tube diameter (in) Q = capacity (US gal/min) = Kinematic viscosity (cSt) Pressure/Head Pressure where: (total force per unit area exerted F = Force by a fluid) A = Area Static Pressure/Head where: (relationship between pressure P = Pressure head (Pa) 3 and elevation) = density (kg/m ) g = acceleration due to gravity (m/s2) h = height of fluid (m) Or where: P = Pressure head (bar) h = height of fluid (m) SG = specific gravity Or where: P = Pressure head (psi) h = height of fluid (ft) SG = specific gravity Total Head where: H = Ht – (±Hs) Ht = total discharge head Hs = total suction head Total Discharge Head where: Ht = ht + hft + pt ht = static discharge head hft = pressure drop in discharge line pt > 0 for pressure pt < 0 for vacuum pt = 0 for open tank Total Suction Head where: Hs = hs + hfs + (± ps) hs = static suction head > 0 for flooded section < 0 for flooded section hfs = pressure drop in suction line ps > 0 for pressure ps < 0 for vacuum ps = 0 for open tank www.mgnewell.com [email protected] [email protected] Friction Loss where: (Miller equation) Pf = friction loss (Pa) fD = friction factor (Darcy) L = tube length (m) V = fluid viscosity (m/s) = density (kg/m3) D = tube diameter (m) Or where: Pf = friction loss (bar) fD = friction factor (Darcy) L = tube length (m) V = fluid viscosity (m/s) SG = specific gravity D = tube diameter (mm) Or where: Pf = friction loss (psi) fD = friction factor (Darcy) L = tube length (ft) V = fluid viscosity (ft/s) SG = specific gravity D = tube diameter (in) Darcy Friction Factor where: fD = friction factor (Darcy) Re = Reynolds number NPSHa where: (Net Positive Suction Head NPSHa = Pa ± hs – hfs – Pvp Pa = pressure absolute above fluid available) level (bar) (+hs for flooded section) hs = static suction head (m) (-hs for suction lift) hfs = pressure drop in suction line (m) Pvp = vapor pressure (bar a) Or Pa = pressure absolute above fluid level (psi) hs = static suction head (ft) hfs = pressure drop in suction line (ft) Pvp = vapor pressure (psia) www.mgnewell.com [email protected] [email protected] .
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