PUMPING SYSTEMS DESIGN - INVESTIGATIONS - TRAINING – VERIFICATION
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 Hydraulic design: valves, pipelines and system operation


The hydraulic design of the pumping system includes the following aspects:
  • Calculation of pump head and flow
  • System resistance curve
  • NPSH calculations
  • Suction pipe design,
  • Discharge pipe size
  • Rising main to discharge point
  • Valves such as isolating valves, non-return valves and control valves
  • System design pressures
  • Pipeline velocities
  • Operational aspects such as pump speed control, valve positions and valve operating times
 


Pump head and flow rate

The pump head will have a static and dynamic component, and these factors will determine the system resistance curve. A typical system resistance curve is shown below.


Valves
The following can be provided for valve installations:

•    Analysis of the use of control or isolating valves,
•    Simulation of flow control,
•    Estimation of losses through valves
•    Estimation of valve cavitation

Types of valves

Experience has been gained over many years with the following types of valves:

Common water valves:
Gate valves,
Butterfly valves
Butterfly valves with two-speed closure

Control Valves
Control valves such as Fisher V ball valves,
CCI stacked disc valves
Copes Vulcan control valves
Butterfly valves used as control valves

Non-return valves as follows:

Swing-check valves
Faster closing valves such as Valmatic surge buster valves
Nozzle-check fast closing valves for use with high system deceleration
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