Pump Selection – Fluid Mechanics
Statement:
Choose sizes foe the pump suction and discharge piping to yield appropriate velocities, and then use Goulds Pump Catalog data to identify ALL Model MTX 3196 3X4-10, 3X4-10H, 4X6-10, and 4×6-10H centrifugal pumps having suitable combinations of operating speed and impeller diameter capable of delivering a design flow rate Qdesign=400gpm for the system shown in the sketch(see attachment). For Goulds pumps, the model number identities the pump outlet connection diameter, inlet connection diameter, and maximum impeller diameter.
Assignment requires:
identifying suitable pumps generating two system head-discharge curves:
In BOTH cases, choose minor loss coefficients to account for the applicable minor losses(assume the suction pipe reducer is a sudden contraction, and the discharge pipe increaser is a sudden expansion). Then, read pump head-discharge data pairs from the given manufacturer’s pump curves and use these data to re-plot pump head-discharge curves superimposed over the system head-discharge curves for all combination of pump model, operating speed, and impeller diameter capable of delivering the specified design flow rate for the given system.
Format:
Utilize spreadsheet software for the repetitive calculations involved with generating system head-discharge curves, and for creating “X Y”charts superimposing the appropriate pump head-discharge curves over the system head-discharge curves. There should be 3 or 4 suitable pump model-speed-impeller diameter combinations the can deliver the design flow rate. Then, refer again to the manufacturer’s pump characteristic curves for each suitable pump identifying and tabulating the following information:1.Pump model;2.Operating speed;3.Impeller diameter;4.Total dead at the design flow rate ; 5. Efficiency at the design flow rate;6. Brake horsepower at the design flow rate; 7. Shut-off head.
Create two spreadsheet files to accomplish these tasks:
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