Location

Date

Duration

Language

Discipline

Introduction

Power Plant and other petrochemical industries do deal with different types of valves. All piping systems are fitted with valves for controlling purposes or safety requirements. Understanding the function of each valve type will have an important reflection on the process quality, equipment and plant reliability, and the economics of the whole activity. Different application needs to select the appropriate valve type of particular flow characteristics. Operation of the valve also affects the system and the process. Understanding the problems associated with valves is essential for diagnosis and troubleshooting and the needed maintenance for the particular type of valves.

The reader will be introduced to different types of valves and their different applications. The two most important requirements that determine the valve performance are the valve tightness characteristics, and the flow characteristic of a valve.

Valves can be classified as manual or control valves. When a manual valve is operated via an actuator it becomes a control valve. Valves in general do control the rate of flow in a piping system, the direction of the flow, or act as a relieving device to protect the system from over-pressurization. Valves like check valves would prevent the flow from reversing, thus protecting equipment from reverse flow. Such valves operated automatically without need for any type of actuation. Stop and close valves used mainly to isolate a system in situation of maintenance 

and/or putting the standby equipment in services. The function of a valve is what determines its design. The right selection of a valve in terms of its type and size, and its pressure class is what affect most the stability and reliability of the system. The nature of the fluid, the type of the process, the level of temperature and pressures are parameters affecting the valve selection.

The flow through a valve will experience different effects, like cavitation, flashing, and noise. Water hammer is on of the effects that a check valve may cause. Such phenomenon might lead to different kind of problems, some would affect directly the valve itself and other might upset the process as a whole or result in system erosion or corrosion. Vibration and instrumentation false function could also be a result of faulty valve. Some of these problems can be avoided in the stage of selection and sizing of the valve. Others could be eliminated in the process of writing the specifications and through good communications with manufacturer or vendor. Understanding these different types of problems will help troubleshooting the valves and the systems and help curing the problems. Wrong installations could be the reason behind many of valves problem too.

Objective

This course will address all aspects of Operation, maintenance and Troubleshooting of valves as above, hoping that the participant will benefit a lot from the course and becomes of more understanding concerning the valves.

Audience

Mechanical and Operational Engineers and Technicians who is responsible of Operation, Maintenance and Troubleshooting of Valves of Different types and functions are the most to benefit from this course.

Content

Basics of Valve Technology

Chapter 1

 Valves Technology

Types of Valves 

Valves characteristics 

Sealing performance

Leakage Criterion

Leakage Classifications

Sealing Mechanisms

Valve stem seals

Flow characteristics

Flow through valves

Valve Characterizing Coefficients

Valve flow characteristics

  Linear & equal %

Control Valves & Actuators

Chapter 2

Control Valves

  Functions of manual valves

  Methods of regulation

  Types of control valves

  Gate Valves

  Plug Valves

  Ball Valves

Butterfly Valves

Pinch Valves

Diaphragm Valves

Control Valves & Actuators

  Control Valves Types

Linear Valve Features

  Rotary Valve Features

  Control Valve Flow Characteristics

  Quick Opening Characteristics

  Linear & Equal %

  Actuation systems

  Types of actuators

  Pneumatic Piston Actuator

  Electric motors

  Electrohydraulic Actuators

  Actuator Performance

  Valve Positioner

  Operation of Positioners

  Positioner calibration

Self Operated Valves

Chapter 3

Check Valves

  Applications

  Types of Check Valves

Lift check valves

Swing check valves

Tilting-disc check valves

Diaphragm check valves

  Check Valves Operation

  Water Hammer

  Selection of Check Valves

Relief and Safety Valves

  Relief Valves Types

Pressure-relieving devices

Automatically operated valves

Direct-acting & piloted pressure relief valves

Modulating, full-lift, and ordinary pressure relief valves

  Valve Loading

  Safety Valves

  Operation of Direct-acting pressure relief valves

  Blowdown

Relief valves problems

Rupture Valves

  Applications of Rupture Discs

  Rupture discs vs. Pressure relief valves

  Rupture discs in gases and liquid service

  Temperature and bursting pressure relationship

  Pressure tolerances

  Design and performance of ductile metal rupture discs

  Types of Rupture discs:

Prebulged rupture discs

  Reverse buckling discs

  Vent panels

  Graphite rupture discs

  Double disc assemblies

  Rupture disc and pressure relief valve combinations

         Selection of rupture discs

        Operation of Rupture Discs

Valves Maintenance and Troubleshooting

Chapter 4

Valves Maintenance and Troubleshooting

  High Pressure Drop

  Pressure Recovery Characteristics

  Cavitation in Valves

  Incipient and choked cavitation

  Flow curve cavitation index

  Cavitation-elimination devices

  Flashing versus Cavitation

  Flow Choking

  High Velocities

  Water Hammer

  What causes water hammer?

  Water Hammer Calculations

  Solutions for water hammer

  Surge Protection

  Check valve slamming

  Noise problems

  Clean air standards

  Life loading

  Packing for fugitive-emission control

  Troubleshooting the Control Valves

Certificate

MAESTRO CONSULTANTS Certificate of Completion for delegates who attend and complete the training course

Methodology

Our courses are highly interactive, typically taking a case study approach that we have found to be an effective method of fostering discussions and transferring knowledge. Participants will learn by active participation during the program through the use of individual exercises, questionnaires, team exercises, training videos and discussions of “real life” issues in their organizations.
The material has been designed to enable delegates to apply all of the material with immediate effect back in the workplace.

Fees

$4000