Course Details
Course Outline
5 days course
Introduction to Calculation and Selection of Centrifugal Pumps
- Properties of Liquids, Pressure, Flow, energy, and Head
- Different Pump Types
- Pressure measurement
- Pump head
Basic Pump Principles
- Pump and System
- Pump and System curves
- Hydraulic gradient
- How do pumps work
- USEFUL WORK AND PUMP EFFICIENCY
- Useful work from a pump
- Flow determination
- Pump efficiency
PUMP CLASSIFICATION
- 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
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
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
- Dynamic pressure
- Resistance changes
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
BEARINGS
- What is a bearing ?
- Bearing lubrication
- Bearing failure
- Bearing maintenance
- Bearing seals
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