DEFINE | Management Consultancy & Training

CONTROL & SAFETY RELIEF VALVES: SELECTION, OPERATION, TROUBLESHOOTING

Location

Dubai, UAE

Date

From Date: 01-Jul-2024
To Date: 05-Jul-2024

Duration

5 Days

Language

English

Discipline

Introduction

Ref No:    ME070
Title:       Control & safety relief valves: Selection, Operation, Troubleshooting
Start Date: 01 July 2024  End Date: 05 July 2024
Venue:   Dubai, UAE
Fee:           $5,500

Training will be held at any of the 5 star hotels. The exact venue will be informed once finalized.

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.

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 overpressurization. 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

To introduce the participant to different type of Control Valves and Safety Relief Valves.
To familiarize the participant with the valve characteristics including the valve tightness class and the flow characteristics
To upgrade the participants understanding of the application, operation and design of different types of valves
To provide skills, knowledge and understanding of the principles and practices of the related Codes and Standards related to Control Valves and Safety Relief Valves
To learn the methods for valve selection, specifications and sizing that suit a particular application
To learn methods of valve testing, inspection and troubleshooting based on the industrial and manufacturer codes and standards

Audience

Engineers and Technicians of mechanical, electrical and chemical engineering background will benefit largely from this workshop. Maintenance, Operation, people in workshop and R and D personnel are recommended to attend this course.

Content

COURSE OUTLINE

The following topics including the valve technology, valve tightness and flow characteristics, control valves and safety relief valves types, operation and troubleshooting will be cover during the five day duration of the course.

Basics of Valve Technology

Ch 1 Valves Technology
1. Types of Valves
2. Valves characteristics
3. Sealing performance
  - Leakage Criterion
  - Leakage Classifications
  - Sealing Mechanisms
  - Valve stem seals
4. Flow characteristics
  - Flow through valves
  - Valve Characterizing Coefficients
  - Valve flow characteristics
  - Linear & equal %
5. Control Valves
Ch 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
Ch 3 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
- Electro-hydraulic Actuators
- Actuator Performance
- Valve Positioner
- Operation of Positioners
- Positioner calibration
- Self Operated Valves
Ch 4 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
Ch 5 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
Ch 6 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
Ch 7 Valve Sizing & Selection
- Valve-sizing criteria for manual valves
- Valve-sizing criteria for check valves
- Valve-sizing criteria for throttling valves
- Incipient and advanced cavitation
- Terminal pressure drop ratio
- Percent of Flashing
- Pressure Recovery Coefficient
- Valve Sizing & Selection Procedure
- Selecting a valve type
- Different valve characteristics
- Examples
Ch 8 Valves Problems 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

NOTE:
Pre & Post Tests will be conducted
Case Studies, Group Discussions, Last Day Review, Assessments will be carried out.

Certificate

Define Management Consultancy & Training Certificate of course completion will be issued to all attendees.

Methodology

A highly interactive combination of lectures and discussion sessions will be managed to maximize the amount and quality of information and knowledge transfer. The sessions will start by raising the most relevant questions, and motivate everybody find the right answers. You will also be encouraged to raise your own questions and to share in the development of the right answers using your own analysis and experiences. Tests of multiple-choice type will be made available on daily basis to examine the effectiveness of delivering the course. All presentations are made in excellent colorful power point. Very useful Course Materials will be given.

30% Lectures
30% Workshops and work presentation
20% Group Work& Practical Exercises
20% Videos& General Discussions

Course Details