Offshore Communications
AccountGuest Edition My Account My Che.com Log In

Archives :: Technical & Practical

Displaying 301 - 320 of 501 stories.
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.che.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.che.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.che.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.che.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.che.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.che.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.che.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.che.com/technical_and_practical/Cover-Story-Nano-Know-How_4496.html
February 1, 2009
Eye injuries of all types occur at a rate of more than 2,000 per day in the U.S., and half of those occur in the workplace. In 2006, the U.S. Bureau of Labor Statistics (BLS) reported over 52,000 workplace injuries to the eyes and face, and approximately 70% of those were eye injuries [1]. The need to protect the face and eyes in the workplace is clear. FIGURE 1.  Safety glasses help shield eyes from...
http://www.che.com/technical_and_practical/Eye-and-Face-Personal-Protective-Equipment_4499.html
February 1, 2009
Global warming is of major concern today. There is increasing pressure on industry to reduce both energy usage and the associated CO2 emissions. An important and profitable action that industry can take is to recover more process energy and thus improve the efficient use of that energy. This not only reduces the cost of primary energy supply and lowers CO2 emissions, but also provides benefits in terms of...
http://www.che.com/technical_and_practical/Compact-Heat-Exchangers-Improving-Heat-Recovery_4500.html
February 1, 2009
The use of gasketed plate-and-frame heat exchangers has gained tremendous acceptance in the chemical process industries (CPI) over the past 20 years due to their high heat-transfer coefficients, compactness and low cost. However, it is important for the engineer who is selecting this type of heat exchanger to be aware of critical areas in design or selection so that possible operating or maintenance...
http://www.che.com/technical_and_practical/Plate-Heat-Exchangers-Avoiding-Common-Misconceptions_4501.html
January 13, 2009
I would like to draw your attention to a few points on the November 2008 article, Pressure Relief System Design (pp. 40–45): 1. Pressure drop and pressure loss: The inlet pressure “drop” that the author refers to under Relief system piping is non-recoverable pressure loss, and does not include a “drop” in pressure due to elevation increase. It should be labeled as a pressure...
http://www.che.com/technical_and_practical/Comments-on-Pressure-Relief-System-Design_4473.html
January 1, 2009
As an energy resource, global coal reserves represent 2,000 billion barrels of oil equivalent. In 2007, global oil reserves were about 1,300 billion barrels of oil. World wide, oil demand will grow 40 to 50% by 2030. But coal offers an opportunity to diversify worldwide liquid-fuel supplies and coal utilization to produce fuels that can extend the lifetime of world oil reserves. This is a strategic...
http://www.che.com/technical_and_practical/A-primer-on-coal-to-liquids_4431.html
January 1, 2009
Here, we present criteria needed for the intelligent, effective specification of trays for a distillation or stripping column. Among the key parameters and accessories during specification are column diameter, tray spacing, number of trays, number of passes, type of downcomers, weir heights, provision of downcomer backups, tray pressure drops, design of bottom seal pan, column bottom arrangement, and...
http://www.che.com/technical_and_practical/Tray-Column-Design_4443.html
January 1, 2009
Here, a design approach for continuous stirred-tank reactors is outlined for both reversible and irreversible second-order reactions Multiple CSTRs (continuous stirred-tank reactors) are advantageous in situations where the reaction is slow; two immiscible liquids are present and require higher agitation rates; or viscous liquids are present that require high agitation rates. Unlike in plug-flow reactors...
http://www.che.com/technical_and_practical/CSTRs-Bound-for-Maximum-Conversion_4444.html
January 1, 2009
Ceramic filters are well suited for high-temperature processes that are subject to strict emissions limits, including those for dioxins About Incineration Incineration processes are being widely used more and more to deal with the disposal of waste materials. In many countries, land filling of waste materials is not practical or desirable due to a lack of appropriate sites. Incineration has the benefit of...
http://www.che.com/technical_and_practical/Controlling-Emissions-With-Ceramic-Filters_4445.html
January 1, 2009
In today’s fast track schedules for constructing new capital facilities, the process of designing, delivering and erecting piping often falls in the project’s critical path. This is particularly true for facilities constructed in emerging economies, where the facility generally resides in a remote location, posing significant logistical challenges. Squarely positioned in the center of the...
http://www.che.com/technical_and_practical/Active-Management-of-Pipespool-Fabricators_4446.html
January 1, 2009
Frequently, in chemical processing equipment it is possible to place the shaft support bearings in the chemical that is being processed. In some cases, this precludes the use of oil- or grease-lubricated bearings because the operating conditions are not conducive to the use of such materials. For example, bearings that are lubricated with oil or grease can be problematic when submerged in liquids such as...
http://www.che.com/technical_and_practical/Mechanical-Carbon-In-Chemical-Processing-Equipment_4447.html
December 1, 2008
In a fired thermal fluid heater, a thermal fluid is heated by the metal surfaces of a fired heater or fluegas heat-recovery exchanger. Generally, the heat input rate is controlled to achieve some desired bulk-fluid temperature exiting the heater. However, in being heated to the outlet setpoint, the fluid film in contact with the heating surface is always exposed to a higher temperature than the bulk fluid...
http://www.che.com/technical_and_practical/Cover-Story-Part-1-Heat-Flux-And-Film-Temperature-In-Fired-Thermal-Fluid-Heaters_4384.html
December 1, 2008
Organic-based thermal fluids provide relatively trouble-free service for significant periods of time. However, there comes a time when any fluid (either aromatic- or aliphatic-based) needs to be replaced. Since aromatic-based fluids generally cost more and are complicated to dispose of, they receive far more attention than aliphatic-based fluids when the time comes for replacement. Aliphatic-based fluids...
http://www.che.com/technical_and_practical/Cover-Story-Part-2-Heat-Transfer-Fluids-Maintaining-the-System_4385.html
Pages: « Previous  7 8 9 10 11 12 13 14 15 [16] 17 18 19 20 21 22 23 24 25 Next »

Get more from Che.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 21,000 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...