Articles

241-260 of 334 < first | | | last >
  • Final control

    What’s the latest on control valves? Here's a look at the current marketplace for the final element that all control stuff is aimed at—the control valve that produces the end result.

    Walt Boyes, Editor in Chief
    04/17/2007
  • Choose the right fluid for your pressure test

    Compressed gas often makes the most sense for checking a process, according to Senior Editor Dirk Willard, in this month's Field Notes column.

    Dirk Willard, senior editor
    04/12/2007
  • Sulzer Chemtech relocates to new, expanded facility

    Recognized throughout the world for decades as an innovator in the field of mass transfer products, Sulzer Chemtech opened its first Houston facility in 1998. That was the first step in a series of moves designed to position the company in the U.S. market.

    04/10/2007
  • Don’t let parallel pumps cross you up

    Small differences with parallel pumps can lead to big difficulties, according to Andrew Sloley in this month's Plant InSites column.

    Andrew Sloley, contributing editor
    03/28/2007
  • Get full value from partial stroking

    There are two main drivers for partial stroking of valves in safety systems: the desire to extend manual test intervals to as long as possible; and to reduce the amount of redundant hardware required for higher safety integrity levels. Like most things in life, it all boils down to one thing: trying to save money.

    Paul Gruhn, ICS Triplex
    03/20/2007
  • Tips and traps

    Following some partial stroke testing tips can make the process easier. Read on for more tips.

    Paul Gruhn, ICS Triplex
    03/20/2007
  • Make your portable mixer work for you

    Understanding the fundamentals of fluid agitation can help meet the customer’s requirement and the processor’s need for efficiency. While portable mixers have been around for years, they often aren’t used to their full potential. Knowing the basics of mixing and flow patterns can help you get more out of your mixer.

    David Dickey, MixTech, Inc. and Lydia Booth Fenley, Illes Seasonings & Flavors
    03/06/2007
  • How hydraulic modeling can improve the efficiency of your pump systems

    In spite of their large operating cost, most pump systems are inefficient by design. Among the common design problems are non-optimal pipe sizing, control valve utilization and, perhaps most common, incorrectly sized pumps. How a pump operates depends on the system, so improvements must focus on the system as a whole.

    Tom Glassen
    02/20/2007
  • Flowmeters clean and dirty

    ControlGlobal.com contributor David W. Spitzer provides a look from a process automation perspective at how magmeters and Venturi meters are vying with ultrasonics for clean and dirty water applications.

    David W. Spitzer
    11/09/2006
  • Consider changing the speed not the pump

    Chemical Processing's Contributing Editor Andrew Sloley advises that instead of reflexively resorting to brute force to provide enough head, adjusting the pump speed might make for a better solution.

    Andrew Sloley, contributing editor
    11/01/2006
  • Avoid trouble with slurries

    Handling slurries (a mix of solids and liquids), should be based on experience and experiments, not theory. Much of the knowledge obtained from pneumatic conveyors and fluidization systems can be used in understanding slurries.

    Thomas R. Blackwood, Healthsite Associates
    11/01/2006
  • Choosing motor controls and drives

    In any industrial control application, using the right drives and motor controls can make or break the project, and also can make a huge difference in how well those applications perform.

    10/18/2006
  • How to select control valves, Part 2

    When it comes to selecting and sizing control valves and positioners, this article not only helps you pick the right one for the right job, but also includes a valuable valve selection chart you can download!

    Béla Lipták, PE, CONTROL Columnist
    10/17/2006
  • The FRETT approach to pump problems

    Some U.S. oil refineries repair their centrifugal pumps every three years while other refineries enjoy an average repair interval of 10 years. Learn about the highest-performing refineries and other petrochemical companies that have significantly reduced pump failures, and how you can obtain the same results.

    Heinz P. Bloch, P.E.
    10/16/2006
  • Increase pump performance

    In this web exclusive on ChemicalProcessing.com, pump expert Ross Mackay says a key to a pump's performance is to look at the control system it's running with.

    Ross Mackay
    09/18/2006
  • Pump Performance: Kayo Cavitation

    Checking pump performance curves is one of the first steps in troubleshooting a centrifugal pump problem or seeing if a pump can handle new service conditions. Learn to look for more than just insufficient NPSHA, the common culprit, when investigating cavitation.

    Andrew Sloley, contributing editor
    07/17/2006
  • Keep a steady eye on measurements

    While engineers often strive to keep processes running without too much variation, measurements that don’t change may be a cause for concern not celebration, as one refinery can attest.

    Andrew Sloley, contributing editor
    06/19/2006
  • Pumping Temperature Considerations

    "Bad actor" pumps are those pumps that have trouble with frequent and repetitive failures. In many cases, the source of the problem is an ANSI pump trying valiantly to handle a liquid well beyond the range of its design rating.of 300 degs. F.

    Ross Mackay
    06/19/2006
  • Mind Mixer Mechanical Design

    While most mixers can provide a long service life — for instance, some are still operating after more than 30 years — mechanical problems can shorten life or even break parts. In this article, learn about all the mechanical problems that may befall your mixing equipment.

    David S. Dickey, MixTech, Inc.
    04/18/2006
  • Find the real cause of pump gas up

    Simply blaming high feed temperature for inadequate suction isn’t enough when diagnosing pump problems. Read this article to get a laundry list of causes for pump gas up.

    Andrew Sloley, contributing editor
    04/17/2006
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