Process Control Systems
Go to Specific Subject: Advanced Process Control and Optimisation | Alarm Management | Batch Control | Cascade Control | Compressor Surge Control | Control Room Design | Control Systems | Fuzzy Logic | Modbus | Proportional, Integral and Derivative Control | Decentralised Control | Pneumatic Controllers | Process Sequence Control Documentation Standards | Programmable Automation Controllers | Loop Tuning | Modelling and Optimisation | Process Control Security | Process Control System Ergonomics | Legacy Process Control Systems | OPC - OLE for Process Control |
Useful Process Control System links
Terminology and Symbols in Control Engineering - from Samson Controls.
Control System Security
Digital Control Systems and their associated industrial networks/protocols are extending the depth to which bi-directional communications extend throughout an enterprise. In many cases, the underlying technology for the business network and the process control network are the same. Consequently, many of the risks that are found in today's corporate or business environments can now impact the reliable operation of the process control system. This page and the links...
Fuzzy Control System - Fuzzy logic is widely used in machine control. The term itself inspires a certain skepticism, sounding equivalent to "half-baked logic" or "bogus logic", but the "fuzzy" part does not refer to a lack of rigour in the method, rather to the fact that the logic involved can deal with fuzzy concepts-concepts that cannot be expressed as "true" or "false" but rather as "partially true". Although genetic algorithms and neural networks can perform just as well as...
Dynamic Process Simulators and Training Systems
Immersive Virtual Reality Plant - A Comprehensive Plant-Crew Training Solution Improves Process Reliability and Safety - Capital-intensive industries face the challenge of replacing an aging workforce with a computer-savvy, gaming generation over the next five years. Industries such as oil and gas,refining and power companies must institutionalize their workforce knowledge in efficient and effective ways. Leveraging virtual reality (VR) models...
Go to Specific Subject: Choke Valve General Information | Choke Valve Design Specification | Choke Valve Maintenance and Inspection | Common Choke Valve Problems and Solutions | Choke Valve Papers and Applications | Subsea Choke Valves | Choke Control Systems
Choke Valve General Information
Choke Valves are severe service valves which are designed specifically for oil and gas wellhead applications, both in a surface and subsurface context. They are used for controlling the...
Composite valves are made from strong, light weight composite materials. Their graphite and fiberglass reinforced thermoset and thermoplastic resins are resistant to acids, caustics, bleaches and more than one thousand other industrial and waste treatment chemicals, at half the cost of traditional alloy valves.
Control Valve Actuators
Go to Specific Subject: Compact Valve Actuator Solutions and Systems | Subsea Valve Actuators | Offshore Valve Actuator | High Pressure Manifolds Actuators | Safety Related Systems Valve Actuator Systems | Spring Return Hydraulic Actuators | Spring Return Pneumatic Actuators | Compact Double Block & Bleed (DBB) Valve Actuators | Double Acting Actuator | Compact Actuators in Floating Liquefied Natural Gas (FLNG) Applications | Valve Actuator General Information |
This Comprehensive Control Valve Technical Information Page covers Selection and Design, Cavitation and Flashing in Control Valves, Control Valve Actuators, Butterfly Control Valves, Control Valve Sizing, Split Range Control Valves, Control Valve Applications, Control Valve Noise Calculation and Prediction, Control Valve Maintenance, Control Valve Positioners and Self Operated Regulators.
Scroll Down for Technical Information on Control Valves
Go to Specific Subject: Control...
Evaluation of ControlValve Performance is Necessary in Plant Betterment Programs
Sanjay V. Sherikar, Ph.D., P.E.
22591 Avenida Empressa
Rancho Santa Margarita, CA 92688
Phone (949) 858 1877
Fax (949) 858 1878
Control valves affect the performance of power plant in terms of output, heat rate, reliability and availability because they are the final control elements in the operation. Therefore, critical evaluation of control valves must to be an integral...
Fire Safe Control Valve Actuators
An essential part of equipment safety is to be able to maintain the fail-safe position when a fire breaks out. In case of pneumatic linear actuators, the fail-safe position must be assumed and maintained when air supply fails or the diaphragm ruptures.
Usually, springs are used to perform this task. They force the valve to move to the fail-safe position when dangerous situations emerge or damages occur. On failure of air supply, the Actuator springs act...
Fluid Kinetic Energy as a Selection Criteria for Control Valves
A selection criteria is provided that assures a control valve will perform its control function without the attendant problems of erosion, vibration, noise and short life. The criteria involves limits on the fluid kinetic energy exiting through the valve throttling area. Use of this criteria has resolved existing valve problems as demonstrated by retrofitting of the internals of many valves and vibration measurements...
Getting Optimum Performance through Feedwater Control Valve Modifications
Brian Leimkuehler, P.E.
(Presently at ComEd, LaSalle County Nuclear Station)
Sanjay V. Sherikar, P.E.
22591 Avenida Empressa
Rancho Santa Margarita, CA 92688
FROM: Sixth EPRI Valve Technology Symposium
July 14-16, 1997
Good control of the feedwater system is very important for smooth operation at nuclear power plants. The performance of the feedwater control valves, which are the final...
Specialist Oil and Gas Valves
Go to Subject Titles:- Oil and Gas Cryogenic Ball, Gate, Globe and Check Valves | Oil and Gas General Service Valves | Oil and Gas High Pressure Valves | Oil and Gas High Integrity Valves for Critical Applications | Ball Valve Single Isolation and Double Block and Bleed | Zero Stem Leak Valves | Anderson Greenwood | Primary Isolation Double Block and Bleed Valves |
Prochem Specialist Valving Solutions - Speciality valves are all manufactured from bar or...
Specialist Power Plant Valves
HORA is one of Germany's leading manufacturers of control valves with more than 35 years of experience. This independent company specialises in the design and manufacture of severe service valves in power plants, e.g turbine bypass stations, desuperheaters, pump protection valves and feedwater control valves. The company's minimum flow valves protect centrifugal pumps from potential damage caused by thermal and hydraulic overloads at low load operations. Hora...
A Pressure Regulator automatically regulates the flow to maintain pressure in accordance with the amount of demand.
Go to Specific Area of Interest: Pressure Regulator Technical Information | Principal of Operation and Sizing of Pressure Regulators | Pressure Regulator "Droop" | Pilot Operated Regulators | Tank Blanketing Valves | Vacuum Regulators and Breakers |
Pressure Regulator Technical Information
The following information is from GO Regulator:
Pressure Safety Relief Valves
Safety and Relief Valves for Steam, Gas, Vapour & Liquid Service - Protection of personnel and equipment is the paramount concern in the selection of safety relief valves for plant operating systems. Only the most reliable safety valves should be considered for such a crucial role.
Rupture Disc Technical Information
An Introduction to Rupture Disc Technology - from BS&B.
The following excellent technical references are from Cheresources Philip Leckner:
Rupture Disk Specification
Whilst every effort is made to ensure technical accuracy of the information supplied on iceweb.com.au, Keyfleet Pty Ltd and its employees accept no liability for any loss or damage caused by error or omission from the data supplied. Users should make and rely on their own independent inquiries. By accessing the site users accept this condition. Should you note any error/omission or an article offends please do not ignore it, contact the This email address is being...
Shutdown (SDV) and Blowdown (BDV) ESD Valves
Go to Specific Subject: Design of Shutdown (SDV) and Blowdown Valves (BDV) Emergency Shutdown Valves (ESV) | Types of Shutdown (SDV) and Blowdown Valves (BDV) | Reduced Bore Valves | Shutdown (SDV) and Blowdown (BDV) Underlying Causes of Failures and Lessons Learnt | Material Selection for Shutdown (SDV) and Blowdown Valves | Shutdown Valves (SDV) and Blowdown Valves (BDV) Seat Leakage Classifications and Standards | Shutdown Valves (SDV) and...
Severe Service Valves
Go to Specific Subject : Severe Service Valve Description and Applications | Severe Service Control Valve Design for Abrasive Conditions | Severe Service Control Valve Design for Corrosive Conditions | Severe Service Control Valves on Cavitation Services | Severe Service Valves for Liquid Application | Severe Service Valves for Gas Application | Severe Service Valve Technical Papers and Articles | Severe Service Control Valves on Flashing / Outgassing...
Go to Specific Subject: Solenoid Valve Specification | Solenoid Valve Selection Installation, Maintenance and Troubleshooting | Low Power Solenoid Valves | Solenoid Valves in Safety Instrumented Systems | Miniature Solenoid Valves | Solenoid Valves for Offshore Applications | Solenoid Valves for Miscellaneous Applications
Solenoid Valve Specification
The following excellent links are from ASCO.
Understanding IEC Aerodynamic Noise Prediction for Control Valves
Floyd D. Jury
Technical Consultant, Fisher Controls International, Inc.
ICEWeb thanks Fisher Controls for permission to include this article
In 1995, the International Electrotechnical Commission (IEC) released International Standard IEC 534-8-3 which is designed to calculate a sound pressure level for aerodynamic noise pro-duced by a control valve. This internationally approved and accepted standard is important because it...
Go to Specific Subject: Compact Valve Actuator Solutions and Systems | Subsea Valve Actuators | Offshore Valve Actuator | High Pressure Manifolds Actuators | Safety Related Systems Valve Actuator Systems | Spring Return Hydraulic Actuators | Spring Return Pneumatic Actuators | Compact Double Block & Bleed (DBB) Valve Actuators | Double Acting Actuator | Compact Actuators in Floating Liquefied Natural Gas (FLNG) Applications | Valve Actuator General Information | Scotch...
Instrument Valves and Accessories
Instrument Valves and Accessories are a critical part of any Instrument Hook Up. The valves and accessories include those listed below.
Go to Specific Subject: Common Questions Associated with Instrument Valves and Accessories | Instrument Ball Valves | Instrument Bleed Valves | Instrument Check Valves | Close Coupled Mono flange and Large Bore Direct Mount Manifold | Primary Isolation Double Block and Bleed Valves | Instrument Excess Flow Valves |
CANopen - CANopen is a CAN-based higher layer protocol. It was developed as a standardized embedded network with highly flexible configuration capabilities. CANopen was designed for motion-oriented machine control networks, such as handling systems. By now it is used in many various fields, such as medical equipment, off-road vehicles, maritime electronics, public transportation, building automation, etc.
CAN-do Cable Solutions for Many Applications - Previously, automobiles...
There are many subjects on this page, simply jump to where you wish to go by selecting the one that you are interested in: Foundation Fieldbus Basics | Justifying and Economics of Foundation Fieldbus | Foundation Fieldbus Design | Foundation Fieldbus Control in the Field | Foundation Fieldbus Parameter Search | Foundation Fieldbus High Speed Ethernet (HSE) | Lightning and Surge Protection of Foundation Fieldbus Systems | Foundation Fieldbus Registered Products | Foundation Fieldbus...
Fieldbus – Competent People will be at a Premium
Whatever digital fieldbus is your preference, if one wishes to maximise personal marketability it is time to think about gaining the competencies required to implement the technology.
Few would remember the last watershed in instrumentation, that is the change from pneumatics to electronics. Unfortunately I do and recollect it really hit home hard. At the time we had Scientific Instrument Makers who were responsible for the pneumatics and all...
Highway Addressable Remote Transducer Protocol (HART)
Highway Addressable Remote Transducer Protocol (HART)
HART - The Premier Tool for Asset Management - Cut downtime and improve profits with the tools you already have - Do more with less. That’s the mantra of many industries today in North America or anywhere...
Industrial Ethernet - The use of Ethernet as an industrial network is a subject for which still very little documentation is available. This publication focuses entirely on this type of usage of Ethernet, and how this relates to the operation of Ethernet. A difference between an office-user of Ethernet and an industrial user of Ethernet is that the former is not interested in (seemingly trivial) details of internal Ethernet operation, while the latter must sometimes know...
Modbus has been around for years and is utilised comprehensively by Industry.
The following technical information is from Moore Industries-Pacific, Inc.
Using MODBUS for Process Control and Automation - MODBUS is the most popular industrial protocol being used today, for good reasons. It is simple, inexpensive, universal and easy to use. Even though MODBUS has been around for nearly 30 years, almost all major industrial instrumentation and automation equipment vendors continue to...
PROFIBUS - This multidrop technology has been available for a number of years and is particularly suitable in the manufacturing environment. Does not have Control in the field option at present. Particularly favoured in Germany where it was developed. Lots of technical information can be found at this excellent Profibus site. You have to register to get to it.
Profibus - A comprehensive 44 page technical paper from Samson Controls.
Fieldbus Wars revisited? There has been an...
Why should you Choose Intrinsic Safety rather than Flameproof or FNICO for Fieldbus Applications?
The answer here is “why not” choose Intrinsic Safety since a fieldbus power supply is required for Exd, whilst a Fieldbus Non Incendive Concept (FNICO) power supply is required for FNICO (Zone 2 only) and a Fieldbus Intrinsically Safe Concept (FISCO) power supply for Zone 1.
Zone 0 applications can be accommodated by additional hardware and use of the Entity concept.The Entity concept limits...