Specific Speed of pump (Nq) is defined as the speed in RPM at which a geometrically similar impeller … of Impeller. Title: Microsoft PowerPoint - AGITMIXCM_Abraham_Martin.ppt Created Date: 10/7/2003 4:41:31 PM Open - The right impeller below has a completely open space between each blade that allows for easy CIP, but provides less power than disk impellers. Table1.Resultsofcentrifugalpump(impeller) R=R RA-RD (29) C D 3 β=β- β2-β1 (30) 3 βC=β1 β2-β1 (31) 3 R2-R2 L = A B a (32) 2 Rcosβ-Rcosβ A 2 B B Lb= RB-RC 2 RBcosβB-RCcosβC 2 2 ( 3) RC-RD Lc=2Rcosβ-Rcosβ (34) C C D 1 No Descriptions Value Units 1 Specificspeed,ns 147 mm 2 … Specific Speed of Pump. Propeller turbine mixer design calculator solving for Reynolds number given impeller diameter, fluid dynamic viscosity, revolution per second and liquid mass density. Impeller's Diameter Effect - Pump Curve / … 6 Other Pump Formulas Affinity Laws Changes in Diameter Changes in Speed D = diameter, in or mm Q = flow, gpm or m3/h H = head, ft or m P = power, hp or kW Q = flow, gpm or m3/h Both, measured and calculated results are in good agreement. parallel with the axis of the impeller shaft. Type of Impeller (Np) Vessel Diameter Sweep Dia. Figure 3 shows the types and variation of common impellers. Radial-flow impellers generate currents in a tangential or radial direction to the axis of the impeller shaft. Therefore, we will generate a new set of Q and H values for the 11-in impeller by multiplying the given Q values by the factor 1.1 and the H … XylemWaterSolutions 73,706 views. 2:09. Pump flow is taken at the largest impeller diameter For double suction impellers pump flow is divided by two . Using affinity laws for impeller diameter changes, the multiplying factor for flow rate is: Factor = 11/10 = 1.1 and the multiplier for head is (1.1) 2 = 1.21. Within the two classes of impellers there exist three main types of impeller design. Download Video. Flygt - Wastewater N-Pump Adaptive N Impeller Design Explained - Duration: 2:09. A performance curve is a plot of Total Head vs. flow rate for a specific impeller diameter and speed. Tools for Design & Manufactures of Pressure Vessels and Shell & Tube Heat Exchanger Agitator Design (Mech.) backswept impeller with advanced blade geometry and high design rotor pressure ratio (π t12 =4.7:1). Laser measurements and 3D-viscous calculations were performed to verify the design of a 30deg. Curved - Curved (a.k.a. The specific speed “Nq” is a parameter derived from a dimensional analysis which allows a comparison of impellers of various pump sizes even when their operating similar Q -H range.. 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