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Edited By L. Bachus, Bachus Company Inc A Custodio
Description Pumps are commonly encountered in industry and are essential to the smooth running of many industrial complexes. Mechanical engineers
entering industry often have little practical experience of pumps and their problems, and need to build up an understanding of the design,
operation and appropriate use of pumps, plus how to diagnose faults and put them right. This book tackles all these aspects in a readable
manner, drawing on the authors' long experience of lecturing and writing on centrifugal pumps for industrial audiences.
Audience
Mechanical engineers, fitters and maintenance engineers.
Contents
Chapter 1: Basic Pump Principles
Introduction How do pumps work? Pressure measurement Atmospheric pressure
(ATM) Absolute pressure (psia) Gauge pressure (psig) Vacuum Pump head Specific gravity Pressure measurement Pressures
inside the pump
Chapter 2: NPSH, Net Positive Suction Head
Introduction Definition of NPSHr (required) Definition
NPSHa (available)
Chapter 3: Cavitation
Introduction Vapor pressure Cavitation The effects of vapor
pressure on pump performance Cavitation: A practical discussion Review for preventing cavitation Cavitation review Do
something about cavitation!
Chapter 4: The Affinity Laws
Introduction The Laws The Affinity Laws and
the impeller diameter What's the practical application of these laws?
Chapter 5: Useful Work and Pump Efficiency
Useful work from a pump Flow determination Pump efficiency Factors that affect the efficiency Calculating pump efficiency
Chapter 6: Pump Classification
Introduction Positive displacement pumps Centrifugal pumps Conceptual
difference Centrifugal volate pumps Types of centrifugal pumps Overhung impeller Impeller between the bearings Turbine
pumps Specific duty pumps The typical ANSI pump API (American Petroleum Institute) pumps Vertical turbine pumps Non-metalic
pumps Magnetic drive pumps Canned motor pumps Pump impellers Turbine impellers Conventional impellers Suction
specific speed, Nss Open impellers Semi open impeller Totally enclosed impeller Wer bands Specific speed, Ns
Chapter 7: Understanding Pump Curves
Pump performance curves History Head versus pressure H-Q Pump
efficiency The energy (BHp) curve The pump's minimum requirements (NPSH) Special design pumps Family curves
Chapter
8: The System Curve
The system controls the pump The elements of the Total Dynamic Head (TDH) Determining the Hs
Determining the Hp Calculating the Hf and Hv The dynamic system Variable elevations The happy zone Dynamic pressures
Variable resistances Short term reistance changes Long term reistance changes Pumps in parallel and pumps in series Pumps
in parallel Three tips Pumps running in series Combined parallel and seris pump operation
Chapter 9: Shaft Deflection
Introduction Operation, design and maintenance Signs of shaft deflection Interpreting the evidence The sweet zone
The dual volute pump
History
Vegetable fibers Reciprocating action Packing Rotary action Synthetic fibers Compression packing The lantern
ring The packing lubricant Stages in the life of packing
Chapter 13: Mechanical Seals
Pump packing History
The mechanical seal The single, unbalance, insider mounted mechanical seal The single, outside-mounted, unbalanced seal The
single, balanced, internal mechanical seal The single, balanced, external mechanical seal Advantages of o-rings The balance
effect Advantages of balance Balance explained by math Cartridge mechanical seals Double seals The tandem dual seal
The back-to-back double seal The fact-to-face dual seal Support systems for dual seals The thermal convection tank The
turbo tank The pumping unit
Chapter 14: Failure Analysis of Mechanical Seals
Causes of premature seal failure
O-ring (the elastomer) failure The elastomer sticks to the shaft The springs clog and jam The shaft frets under the shaft
seal Incorrect installation dimension Environmental controls for difficult sealing applications Difficult pumping applications
for mechanical seals Environmental control Proper pump repair alignment methods
Chapter 15: Common Sense
Failure Analysis
Pump maintenance files Failure analysis on centrifugal pumps Why is this pump in the shop?
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