Archives :: Technical & Practical

Displaying 321 - 340 of 533 stories.
July 1, 2009
Despite the immense value and universal appeal of these additives for product designers, process engineers facing the day-to-day reality of full-scale production face a unique set of challenges. Dispersing these powdered additives into a liquid is one of the most formidable challenges in the chemical process industries (CPI). Although most can be dispersed fairly easily in a common laboratory mixer, when...
http://www.chemengonline.com/technical_and_practical/Disperse-Difficult-Solids_4926.html
July 1, 2009
Meanwhile, the revamp opportunities that a turnaround provides are, themselves, few and far between. Petrochemical refineries, for instance, typically try to get five years between major turnarounds to maximize on-stream time. Some equipment can be connected before an actual shutdown, but most of the so-called tie-ins must fall into place during the turnaround, which usually lasts only 20–50 days...
http://www.chemengonline.com/technical_and_practical/Revamps-Strategies-for-A-Smooth-Turnaround_4931.html
June 1, 2009
Figure 1.  Vibratory feeders are particularly well-suited for fragile or friable materials, and hard-to-convey powders Figure 2. Today’s advanced electromagnetic drives address many shortcomings of earlier designs The need to move, convey and feed materials exists in virtually all segments of the chemical process industries (CPI). Vibratory feeding and conveying equipment (Figure 1) has been...
http://www.chemengonline.com/technical_and_practical/Vibratory-Feeders-And-Conveyors-Useful-Selection-Tips_4815.html
June 1, 2009
A new correlation that matches most commercial trays The sieve tray has been in the distillation market place for many decades. It has been used extensively in distillation columns worldwide as a highly efficient vapor-liquid-contacting device. Many people have examined dry tray pressure-drop data for sieve tray decks and there have been several attempts to correlate these data. But the error of such...
http://www.chemengonline.com/technical_and_practical/Dry-Tray-Pressure-Drop-Of-Sieve-Trays_4816.html
June 1, 2009
Figure 1.  Many self-testing ground- ing clamps also monitor cable condition back to the designed ground point, and will alert the operator if the cable has worked tself loose or is broken We are all familiar with the effects of static electricity in everyday life — the sharp spark we experience as we approach a metal file cabinet or the crackle we feel as we remove a garment made of synthetic...
http://www.chemengonline.com/technical_and_practical/Avoiding-Static-Sparks-In-Hazardous-Atmospheres_4817.html
June 1, 2009
The whole-product-lifecycle approach presented here encompasses more than basic selection Typical discussions of flowmeter selection address specifications, technologies, accuracies and performance, but there are many other steps that are not normally considered. This article focuses on these often overlooked criteria, which inevitably have far-reaching and costly implications over the life of the...
http://www.chemengonline.com/technical_and_practical/Beyond-Flowmeter-Selection-Consider-Some-of-the-Most-Overlooked-Criteria_4818.html
May 1, 2009
Evaporation of moisture or volatile organic compounds (VOCs) from bulk solids usually takes place in two stages: one in which the drying rate is constant, and the second in which the rate decreases over time. Devolatilization during the first stage is rapid and can be readily accomplished in flash, spray, or fluidized bed dryers. In the second stage, however, the VOC or moisture removal rate is diffusion...
http://www.chemengonline.com/technical_and_practical/Designing-and-Operating-Gravity-Dryers_4768.html
May 1, 2009
By continuously monitoring for abnormal situations, such as a fire, and combustible or toxic gas releases, fire and gas (F&G) detection and mitigation systems are the linchpins to maintaining overall safety and operation of industrial facilities. The premise of these systems is to protect processes and the environment by providing early warning of incidents and enabling actions that prevent them from...
http://www.chemengonline.com/technical_and_practical/Fire-and-Gas-in-Safety-Systems_4769.html
May 1, 2009
Because temperature control is important in any process, a water-cooling system is a common component in chemical processing plants. For facilities located near coastal areas, the tendency is toward the use of seawater instead of river water for cooling purposes. Seawater has the advantage of having nearly a constant quality (chemical analysis), nearly a constant temperature and is available in large...
http://www.chemengonline.com/technical_and_practical/Engineering-Practice-Optimal-Cooling-Systems-For-Coastal-Plants_4770.html
May 1, 2009
In recent years, a growing number of projects throughout the chemical process industries (CPI) have been carried out using Engineer-Procure-Construct (EPC) contracts. Because such contracts typically involve the work of numerous subcontractor parties, they tend to be complex. As such, specialized tools are required to manage their information- and project-management needs. In general, operating companies...
http://www.chemengonline.com/technical_and_practical/EPC-Contractors-Selecting-an-ERP-Package_4771.html
April 3, 2009
I recently read Hydrogen-Pinch Analysis Made Easy Chem. Eng., June 2008, pp. 56–61. The paper presents an automated spreadsheet program to target the minimum fresh hydrogen resource for a hydrogen network. While the effort of the authors is appreciated, I do not agree with some claims in the paper, including the following: The authors do not acknowledge an earlier work by El-Halwagi (2003), which is...
http://www.chemengonline.com/technical_and_practical/Hydrogen-Pinch-Analysis-Made-Easy-Discussion-between-a-reader-and-the-authors_4682.html
April 1, 2009
Interest in energy efficiency is not a fad. The economics of industrial production, the limitations of global energy supply and the realities of environmental conservation will be enduring themes for decades, if not the millennia. As energy costs increase, pump manufacturers respond with an understanding of the importance of making equipment more efficient at saving energy. Traditional methods of...
http://www.chemengonline.com/technical_and_practical/Optimizing-Pumping-Systems_4653.html
April 1, 2009
A chemical executive once noted that his firm derives one-third of its income from products that are less than ten years old. Indeed, existing companies thrive and new ones proliferate through innovation and product improvement. They depend on scientists and engineers working "in the trenches" or "at the bench" to drive development. Yet, most potential innovations never succeed...
http://www.chemengonline.com/technical_and_practical/Capital-Costs-Quickly-Calculated_4654.html
April 1, 2009
Pneumatic conveying of bulk solids has been successfully practiced — in industries as diverse as chemical, agricultural, pharmaceutical, plastics, food, mineral processing, cement and power generation — for more than a century. Pneumatic conveying provides advantages over mechanical conveying systems in many applications, including those that require complex routing, multiple source-destination...
http://www.chemengonline.com/technical_and_practical/Understanding-Bends-In-Pneumatic-Conveying-Systems_4655.html
March 1, 2009
Protecting process systems from overpressurization is vital throughout the chemical process industries (CPI). Both safety relief valves and rupture disks are commonly used for this purpose. Sometimes the combination of a relief valve with a rupture disk can add service life to the relief valve and prevent process leakage, which is important from safety, conservation and financial standpoints. This article...
http://www.chemengonline.com/technical_and_practical/Combining-Rupture-Disks-with-Safety-Relief-Valves_4582.html
March 1, 2009
Rupture disc devices provide overpressure protection for a variety of storage and process vessels and equipment. The objective of the rupture disc is to maintain a leak-tight seal and be a passive bystander until called upon to relieve excess pressure. While this is generally the case, there are times when rupture disc performance can be adversely affected through various installation, operation and...
http://www.chemengonline.com/technical_and_practical/Getting-the-Most-Out-of-Your-Rupture-Disc_4583.html
March 1, 2009
Technical and specialty gases find use in many synthesis processes and a number of unit operations, in analysis and in plant maintenance. This article outlines applications for gases in fine and specialty chemistry, ranging from synthesis processes and inerting to off-gas treatment and industrial services. For each one, processes and the field of use are briefly explained, and existing technical solutions...
http://www.chemengonline.com/technical_and_practical/Feature-Report-Industrial-Gas-Applications_4584.html
March 1, 2009
The patented design of this unit improves grinder efficiency The Annihilator (photo) is a twin-shaft, solids-reduction unit designed for a variety of industrial and municipal installations, including sewage lift stations, head works and sludge processing systems. The unit’s counter-rotating, hexagonal-shaft design coupled with its five-tooth, hardened-steel cutters provide the maximum shredding...
http://www.chemengonline.com/technical_and_practical/Focus-on-Milling-and-Grinding_4585.html
February 1, 2009
Conveyor selection is always defined by the larger project that it is meant to serve. First, there is a broad range of performance factors that must be met. Meanwhile, health, safety and environmental considerations usually outweigh the costs involved. After that, it comes down to the usual commercial considerations of price and delivery. This article covers the main parameters, benefits and disadvantages...
http://www.chemengonline.com/technical_and_practical/Selecting-A-Conveyor_4493.html
February 1, 2009
This brief introduction to nanotechnology provides a basic understanding to those new to the field Most chemical engineers and chemists are aware of the recent excitement generated by nanotechnology, but many may wonder what all the fuss is about. Nanotechnology deals with small, nanometer-scale objects, which chemical engineers and chemists deal with everyday, at least in the form of atoms and molecules...
http://www.chemengonline.com/technical_and_practical/Cover-Story-Nano-Know-How_4496.html
Pages: « Previous  8 9 10 11 12 13 14 15 16 [17] 18 19 20 21 22 23 24 25 26 Next »

Get more from ChemEngOnline.com
Get email updates in your inbox

 

Subscribe to:
Chemical Engineering Magazine

Chemical Engineering Magazine and Archives

Plant Cost Index

Join us on... Twitter LinkedIn

LinkedIn Groups

Our LinkedIn group is now over 30,000 members strong!

  1. Join other CPI professionals from all over the globe and share best practices, expertise, concerns and more.
  2. Provide feedback to Chemical Engineering Editors


Current members represent Worley Parsons, DuPont, SABIC, Fluor, Air Products, LyondellBasell, Nalco, Dow Chemical, Dow Corning, BASF, Jacobs Engineering, ExxonMobil, Shell, Chevron and more.

Join Now



We also offer the following subgroup for more targeted discussions:

Tools
Search the Buyers' Guide

Plant Cost Index

Facts at Your Fingertips (archive)

Ask the Experts

Back Issues
X
To access this area, please log in or create an account.
Username:
Password:
Forgot your password?
Request it now.
Processing...
Live chat by BoldChat