Page 37 - 2016 NAmer Autumn TD

Electrohydraulic Components Pipe Sizing, Pipe Wall Stresses, and
and Systems NEW! Water Hammer NEW!

PD772 PD777

The introductory part of the course covers the applications of Pipelines move fluids by pumps under steady state conditions. However,
electro-hydraulic systems and the benefits of converting the classical when the flow becomes unsteady – for example, when a downstream
hydromechanical solutions into electro-hydraulic solutions. valve in a pipeline is closed rapidly – the result can be catastrophic.
Changes in the flow direction can create pressure surges producing
The core part of the course delves into electrohydraulic valves,
including solenoid operated valves, proportional valves and servo stress in the pipe wall and a loud banging noise called water hammer.
valves. It is important to understand the relationship between the pipe wall
stresses and the changes in fluid pressure and velocity to predict a
The course reviews the basic functions that are built on the electrical
control units and drivers for such valves, e.g., gain adjustor, overload pipe wall failure. This course will provide the equations and calculations
protection, null adjustment, ramp generator, dead-band eliminator, dither necessary to solve these problems. It will also provide a review of fluid
and pulse width modulation. mechanics: fluid properties, equations for steady and for unsteady flows,
flow in a pipeline, friction factor, hydraulic and energy gradient lines, and
Also discussed are system design considerations and the technicalities axial and hoop stress calculations in a pipe wall. Once this background
of in-field tuning of open-loop and closed-loop electrohydraulic systems. is provided, the unsteady flows can be modeled without undue difficulty.

You Will Learn To Today, the solutions may be obtained rather quickly using a
• Identify the differences in construction, principle of operation, and spreadsheet. Spreadsheet results allow the user to define how quickly
characteristics between ON/OFF valves, proportional valves and a valve is closed, for example, and obtain results immediately. The
servo valves user may change pipe diameter, friction factor, pipe length, etc., and
• Apply real-time control technique for EH systems and perform infield immediately determine the effects on pressure and on flow rate. Other
tuning to adjust the system performance unsteady flows can also be described by the same equation. In fact, the
• Describe the basic electronic schematics of the proportional/servo water hammer problem can be extended to model the unsteady flow of
valve amplifiers other fluids. (Oils, for example, are especially important.)
• Select the best components required to build open- and closed-loop The course will include exercises to provide participants the opportunity
electrohydraulic control systems to solve unsteady flow problems with spreadsheets using the proper
equations and calculations. FLUIDS AND HEAT TRANSFER Public Courses
Who Should Attend
Application engineers, system integrators, motion control engineers, Participants will be provided with a copy of Introduction to Fluid
sales engineers, field engineers and end users of electrohydraulic Mechanics by William S. Janna.
components
You Will Learn To
Instructor Medhat Khalil • Model steady flow fundamentals in a pipeline
4 Days, 3 CEUs, 30 PDHs • Describe and model the unsteady flow called water hammer
Member $2,295 / List Price $2,450 • Explain how water hammer results in excessive pipe wall stresses
• Predict when such stresses exceed the yield stress of the pipe
material
• Avoid pipeline design and operating conditions that may lead to
water hammer

Who Should Attend
The class is designed for practicing engineers in the power and process
piping areas, including those in power companies, utility companies,
valve and pipe manufacturers, oil industries.
Special Requirements
Attendees should bring calculators to the course, and are strongly
encourage to bring laptop computers.

Instructor William S. Janna
4 Days, 3 CEUs, 30 PDHs
Member $2,295 / List Price $2,450

Visit www.asme.org/shop/courses 35