Chemical Engineering March 2017 - 50

ments and the expected life cycle of the
unit where the offering will be deployed.
They can recommend the best measurement
technology or valve selection
and help size the instrument as well.
They can help evaluate the value and
return of additional options or choices.
So leverage their special knowledge and
expertise. Often on a larger project, an
engineering firm with its own subjectmatter
experts may help with selection
and procurement, or selection may be
defined by corporate guidelines or process
licensing requirements.
In the final analysis, the control engineer
is trying to identify and understand
the sources of variability that can impact
product quality, production throughput,
yields, utility consumption and other
economic impacts, and tries to design
controls to attenuate the variability or
move it to a part of the process where
it has less economic impact. By simply
reducing variability, it is possible to operate
nearer to constraints and hence
maximize the processing capability of
the existing plant.
Chemical engineers who are interested
in process control can find many
resources to gain a deeper understanding
in the further reading section.
n
Edited by Scott Jenkins
Further reading
1. Shinskey, F.G., " Process Control Systems: Application, Design
and Tuning, " 4th ed., McGraw Hill, 1996.
2. McMillan, G., " Handbook of Control Engineering, " McGraw Hill,
1999.
3. Blevins, T. and Nixon, M., " Control Loop Foundation - Batch
and Continuous Control, " International Society for Automation
(ISA), 2011.
Author
Lou Heavner is a control engineer at
Emerson (1100 West Henna Boulevard,
Round Rock, TX 78681; Phone: +1
(512) 834-7262; Email: Lou.Heavner@
Emerson.com). Heavner has been with
Emerson for over 30 years, with responsibility
for project engineering, sales and
consulting with customers across all of
the process industries and all over the
world. His current role is to scope and
lead advanced control and optimization projects, primarily in
the oil-and-gas industry. Prior to joining Emerson, Heavner
worked for Olin Corp. as a process automation and control
engineer. Heavner earned a B.S.Ch.E. degree from the Massachusetts
Institute of Technology (MIT) in 1978. When he
isn't helping customers control their processes, Heavner enjoys
controlling his own home brewery operation. He may be
contacted on LinkedIn at www.linkedin.com/in/louheavner.
WHERE THE INDUSTRY TURNS
FOR PRECISE CONTROL
Achieve precise control over every aspect of your chemical operation.
MODEL 521
MODEL 1078
The Model 1078
Vacu-Gard is a pilotoperated
valve,
specifically designed to
reduce blanketing gas
losses on low-pressure
storage tanks.
MODEL 987
The Model 987 is a pneumatic control
valve designed to control moderate
to severe corrosive applications but
may be applied in general service
applications also.
The Model 521 is a sliding
stem, globe style, bellows
sealed, pneumatically
actuated control valve
designed for maximum
corrosion resistance in pure
chemical service.
MODEL 1049
The Model 1049 Secure-Gard
is a pilot-operated vent valve
intended for installation
on atmospheric and lowpressure
storage tanks,
vapor recovery systems,
and process systems.
MODEL 3100
The Model 3100 is a
pressure/vacuum vent
designed to vent the tank
vapor away to atmosphere
and to relieve vacuum
pressure within the tank.
The 3100 is a weight
loaded style.
Cashco, Inc.
P.O. Box 6, Ellsworth, KS 67439-0006
Ph. (785) 472-4461, Fax: (785) 472-3539
www.cashco com
Innovative Solutions
www.cashco com
Innovative Solutions
Circle 11 on p. 90 or go to adlinks.chemengonline.com/66426-11
50
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MARCH 2017
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Chemical Engineering March 2017

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