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Philip Skousen [L. SKOUSEN - Valve Handbook

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Philip Skousen [L. SKOUSEN Valve Handbook

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Copyright 2011 by The McGraw-Hill Companies Inc All rights reserved Except - photo 1

Copyright 2011 by The McGraw-Hill Companies Inc All rights reserved Except - photo 2

Copyright 2011 by The McGraw-Hill Companies, Inc. All rights reserved. Except as permitted under the United States Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher.

ISBN 978-0-07-174390-7
MHID 0-07-174390-1

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Valve Handbook

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About the Author

Philip L. Skousen, ABC, has been associated with the process

equipment industry for more than 35 years, serving in a number

of engineering, marketing, training, and communication

management positions. He has written or contributed to

dozens of technical articles about process valves for Chemical

Engineering, Chemical Processing, Valve Magazine, Control

Engineering, and Control. Mr. Skousen has been an adjunct

faculty member at Brigham Young University for more than

15 years.

Preface to the
Third Edition

Since the first edition of Valve Handbook in 1998, the valve industry has continued to evolve with these dynamic times. Economic pressures brought on by widespread global recessions in 2001 and 2007 have forced the process industry to rely on technology and stricter standards to produce greater efficiencies across the production cycle. In addition, corporate managementconcerned with increasing internal costshas charged their process engineers and plant managers with employing current and new technology to keep manpower costs in check. As the third edition of Valve Handbook shows, the valve industry has responded to these industrial needs.

Although the world recession has slowed the expansion of the process industry over the past decade, demand for process products is now finally increasing, fueled by announcements for new plants or retrofitting of existing plants. For that reason, in 2010 world demand for industrial valves was expected to rise by 5 percent, creating total valve sales of over $65 billion.

In the 1990s, the valve industry made a huge leap forward with the development of onboard smart technology that could interface with emerging communication protocols. The decade of the 2000s was spent fine tuning this evolving technology and making it more user friendly. (For example, wireless has now been added to smart technology.) As we enter a new decade, industrial valves, actuators, positioners, controllers, and accessories are now expected to be more efficient and reliable, and easier to usedespite the complexities of the technology behind digital positioners and other smart technology.

Other trends have emerged. For example, process safety is more important than ever. In this age of environmental concern and high costs of litigation, no corporation can afford a spill or explosion at one of its facilities. Not only do such disasters endanger lives, livelihoods, and production, but they also invite unwanted government and media attention. Such scrutiny brings added legislation, regulation, and oversightnot to mention the public relations nightmares. For this reason, valves in emergency shutdown (ESD) applications have received added attention.

One recent trend worth noting is the advancement of green industries and the technologies behind them. For example, the wastewater industry has made significant improvements in facility and system designs and their ability to produce clean water for their communities from sewage and industrial wastewater. In response to social responsibility and government pressures, the overall process industry has embraced green environmental controls. Chemical, petrochemical, power, pharmaceutical, and food processing industries are now retrofitting their plants to include wastewater systems. In addition, clean-air nuclear energy plants are now making a comeback in many parts of the world as time has shown thatgiven strict adherence to nuclear safety standardsthe risks of a nuclear disaster are minuscule.

The valve industry has continued to support the green goals of the process industry by providing leak-less or leak-resistant valve designs. With the potential of multiple leak paths, valves have historically been a weak link in the process system in terms of fugitive emissions and process or energy leaks. Recent design advancements have improved the integrity of the valve and its ability to resist leakage. Also, the addition of sensors and smart technology has provided additional safeguards to discover leakage or performance problems early.

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