PREFACE The extensive use and increasing popularity of centrifugal
pumping machinery make it necessary for many to become familiar
with this subject in all its phases. In this book an effort has
been made to cover the following ground To illustrate and explain
all the essential features of construction of modern centrifugal
pumps, to present a clear and intelligible theory which shall be
entirely general in its nature, to explain by this theory the pump
characteristics and connect the theory with the actual facts, to
present a thorough discussion of the factors affecting efficiency,
to considerthe characteristics of varioustypes ofpumps and their
suitability for different services, to compare centrifu- gal with
displacement pumps, and to present various general laws and factors
leading to a better appreciation of the field of service of such
pumps and a better means of selecting the proper combinations.
While this is not primarily a book on design, it is believed that a
thorough study of the foregoing will be of value to prospective
designers, and in addition the methods of design of centrifugal
pumps are outlined. The material in this book is based upon a study
of the performances of 123 turbine and 51 volute centrifugal pumps
made by 17 and 12 different companies respectively. The field
covered by them ranged from 1 to 11 stages, heads from 7 to 1843
ft., capacities from 108 to 132,000 gal. per minute, speeds from 62
to 20,000 r.p.m., and efficiencies from 30 to 87 per cent. A
considerable portion of the work is also founded upon the anal-
ysis of tests made by the author upon a volute pump and a turbine
pump for both of which all information regarding dimensions and
other quantitieswas obtainable. With the turbine pump an extensive
and accurate series of tests was made at various speeds from 700 to
2,000 r.p.m. Both of these pumps were regular commercial pumps of
good design, not freak pumps built for experimental purposes only.
The author has drawn upon trade catalogues and several books and
papers for much of his material, due credit for which is given in
the text, but it is believed that a very great deal of the
following treatise will be found to be new. The common usage
regarding terms employed has been followed as far as possible, but
in cases where there were no precedents or where the usage was
illogical and confusing, new terms have been created. It is hoped
that eventually some of these things may become standardized. The
book has been so written as to serve the needs of the practising
engineer who wishes to obtain a grasp of this subject. By the
insertion of problems and questions it is believed that it will be
found equally well adapted for use as a text. The author wishes to
express his gratitude to the various manu- facturers, whose names
are attached to the illustrations in the book, for their valuable
assistance in furnishing such material. He is also indebted to Mr.
F. G. Switzer, Fellow in Sibley Col- lege, for aid in performing
the experimental work and for his criticism of the proof. ITHACA,
N. Y., January, 1915. R. L. D. CONTENTS PAGE PREFACE v CHAPTER I
INTRODUCTION 1 Definition Classification Reaction turbine vs.
turbine pump Historical development Conditions of use Pump size
Rated head and discharge...
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