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Pump behavior analysis

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A 150mm model pump rotating at 1750 rpm has the following characteristic...

A geometrically similar 200 pump having a similar efficiency curve is used to pump water through...

Also answer this question after you solve the attachment question.

If the size of the pump were 275 mm , then what would its maximum efficiency be?

Please refer to attachment for full problem description.

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Solution Preview

Please see the attached files.

Coulson and Richardson, Chemical Engineering, Vol 1

To do this problem, you need to know well the affinity laws, which enables calculation of flow, head, total power and NPSH when changes are made to both impeller diameter and pump speed the equations can be combined to:

where D= impeller diameter and N=impeller speed

Most of the solution comes from graphical determination so you will see minor variation of the results. This does not mean they are inaccurate!

I have plotted the graph in the attached Excel file.

1. Flow, head and power required to drive the 200mm pump
First you plot the pump ...

Solution Summary

The solution provides detailed and step-by-step explanation and answer (including graphs) for the problem.

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55 Miles to the Gas Pump

Expressing your reactions to the ending of "55 Miles to the Gas Pump."

"55 Miles to the Gas Pump:
Rancher Croom in handmade boots and filthy hat, that walleyed cattleman, stray hairs like curling fiddle string ends, that warm-handed, quick-foot dancer on splintery boards or down the cellar stairs to a rack of bottles of his own strange beer, yeasty, cloudy, bursting out in garlands of foam, Rancher Croom at night galloping drunk over the dark plain, turning off at a place he knows to arrive at a canyon brink where he dismounts and looks down on tumbled rock, waits, then steps out, parting the air with his last roar, sleeves surging up windmill arms, jeans riding over boot tops, but before he hits he rises again to the top of the cliff like a cork in a bucket of milk.

Mrs. Croom on the roof with a saw cutting a hole into the attic where she has not been for twelve years thanks to old Croom's padlocks and warnings, whets to her desire, and the sweat flies as she exchanges the saw for a chisel and hammer until a ragged slab of peak is free and she can see inside: just as she thought: the corpses of Mr. Croom's paramours - she recognizes them from their photographs in the paper: MISSING WOMAN - some desiccated as jerky and much the same color, some moldy from lying beneath roof leaks, and all of them used hard, covered with tarry handprints, the marks of boot heels, some bright blue with the remnants of paint used on the shutters years ago, one wrapped in newspaper nipple to knee.

When you live a long way out you make your own fun."

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