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Centrifugal Pumps : Principles, Operation And Design
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Introduction
Learning objectives
Course video sample
Introduction
How do pumps work
Pressure measurement
Pump head
Introduction
NPSH required
NPSH available
Vapor pressure
What cavitation is all about
The effect of vapor pressure on pump performance
Vaporization cavitation
Internal re-circulation
The vane passing syndrome
Air aspiration
Turbulence cavitation
Preventing cavitation
The affinity laws explained
Useful work from a pump
Flow determination
Pump efficiency
Introduction
Positive displacement pumps
Centrifugal pumps
Conceptual difference between centrifugal and positive displacement pumps
Centrifugal volute pumps
Types of centrifugal pumps
Pump impellers 1/2
Suction specific speed, Nss
Pump impellers 2/2
Wear bands
Specific speed, Ns
Pump performance curves
Head vs Pressure (reminder)
The Head-Capacity curve (H-Q curve)
The efficiency curve
The energy curve (BHp curve)
The pump minimum requirement curve (NPSHr curve)
Overview of the 4 curves
Pump family curves
Total dynamic head, TDH
Determining the static head, Hs
Determining the pressure head, Hp
Determining the friction head (Hf) and the velocity head (Hv)
The Hazen and Williams formula
The Darcy and Weisbach formula
The Bachus and Custodio formula
The dynamic system
Dynamic pressure
Resistance changes
Introduction
60° and 240° radial loads
Operation, design and maintenance
Tight tolerances in centrifugal pumps
Signs of shaft deflection : Interpreting the evidence
The sweet zone
The dual volute pump
What is a bearing ?
Bearing lubrication
Bearing failure
Bearing maintenance
Bearing seals
What packing is all about
Packing leakage
Stages in the life of packing
Introduction
The mechanical seal
The single UNbalanced INside mounted mechanical seal
The single UNbalanced OUTside mounted mechanical seal
The single balanced INternal mechanical seal
The single balanced EXternal mechanical seal
O-rings
The balance effect : advantages and mathematical explanation
The cartridge mechanical seal
Double seals
The tandem dual seal
The back to back double seal
The face to face double seal
Support system for dual seals
ABOUT THE COURSE
Introduction
Preview
Learning objectives
Preview
Course video sample
Preview
BASIC PUMP PRINCIPLES
Introduction
Preview
How do pumps work
Pressure measurement
Pump head
NET POSITIVE SUCTION HEAD - NPSH
Introduction
NPSH required
NPSH available
CAVITATION
Vapor pressure
What cavitation is all about
The effect of vapor pressure on pump performance
Vaporization cavitation
Internal re-circulation
The vane passing syndrome
Air aspiration
Turbulence cavitation
Preventing cavitation
THE AFFINITY LAWS
The affinity laws explained
USEFUL WORK AND PUMP EFFICIENCY
Useful work from a pump
Flow determination
Pump efficiency
PUMP CLASSIFICATION
Introduction
Positive displacement pumps
Centrifugal pumps
Conceptual difference between centrifugal and positive displacement pumps
Centrifugal volute pumps
Types of centrifugal pumps
Pump impellers 1/2
Suction specific speed, Nss
Pump impellers 2/2
Preview
Wear bands
Specific speed, Ns
UNDERSTANDING PUMP CURVES
Pump performance curves
Head vs Pressure (reminder)
The Head-Capacity curve (H-Q curve)
The efficiency curve
The energy curve (BHp curve)
The pump minimum requirement curve (NPSHr curve)
Overview of the 4 curves
Pump family curves
Preview
UNDERSTANDING THE SYSTEM CURVE
Total dynamic head, TDH
Determining the static head, Hs
Determining the pressure head, Hp
Determining the friction head (Hf) and the velocity head (Hv)
The Hazen and Williams formula
The Darcy and Weisbach formula
The Bachus and Custodio formula
The dynamic system
Preview
Dynamic pressure
Resistance changes
SHAFT DEFLECTION
Introduction
60° and 240° radial loads
Operation, design and maintenance
Tight tolerances in centrifugal pumps
Signs of shaft deflection : Interpreting the evidence
The sweet zone
The dual volute pump
BEARINGS
What is a bearing ?
Bearing lubrication
Bearing failure
Bearing maintenance
Bearing seals
SHAFT PACKING
What packing is all about
Packing leakage
Stages in the life of packing
MECHANICAL SEALS
Introduction
The mechanical seal
Preview
The single UNbalanced INside mounted mechanical seal
The single UNbalanced OUTside mounted mechanical seal
The single balanced INternal mechanical seal
The single balanced EXternal mechanical seal
O-rings
The balance effect : advantages and mathematical explanation
The cartridge mechanical seal
Double seals
The tandem dual seal
The back to back double seal
The face to face double seal
Support system for dual seals
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