Flow Control

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Synopsis
Liquid flow control can either be achieved by raising or lowering the head using a pump, or by introducing a varying head loss through the introduction of a control valve.
This 2-day workshop looks at both aspects of flow control, as well as how to measure the end result.

Next course: 11/12 July   Cost: R 5 500,00 (no VAT) CPD Points: 2

Content
Pump sizing and selection: Pumps cannot be selected without knowing the piping layout. This workshop shows how the head losses in the system can be calculated to make the final selection, including whether or not cavitation will take place inside the pump, and what to do about it. Pumps in parallel and series are examined, including establishing the resultant flow, which is almost always less than people expect. Final ‘trim’ of the system is also scrutinised, including the uses of impeller trim, speed control and throttling.
Valve sizing and selection: Types of control valves are examined, including their suitability for control, including different types of sliding- and rotary-stem valves. Valve characteristics are studied, and how these are achieved. Sizing is looked at, involving Cv and Kv calculations, and whether choked flow, with the attendant cavitation, is likely to take place. This is done manually, as well as using computer selection programs. Mitigation solutions are discussed, where cavitation cannot be avoided.
Actuator and positioner types are examined, along with selection criteria. Issues of valve noise are also covered.

Outcomes
Engineering of pump installations to operate trouble-free, close to the best efficiency point; trouble-shooting pump problems.
Understanding the problems affecting valve operation; correctly sizing and selecting a control valve for a particular application; determining the root causes of valve problems.

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