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Displaying 361 - 380 of 516 stories.
July 15, 2008
  Plant performance and safety are key issues for the chemical process industries (CPI) and level measurement plays a crucial role in both. Level measurement helps maintain material inventory at economic quantities, improves product quality and ensures a smooth continuous process. It maximizes plant output by avoiding spillage, system clogging, or process upsets. An accurate level-measurement system...
http://www.che.com/technical_and_practical/Cover-Story-Part-1-Level-Measurement-Technologies-For-the-CPI_4009.html
July 15, 2008
Many types of industrial processes utilize liquid level sensors to provide the information needed to monitor and control a process. This enables the design parameters to be maintained in order to produce the end product at the desired level of quality and throughput. Typical sensors may measure product level, interface level, as well as temperature. The type of measurement and the sensor technology will...
http://www.che.com/technical_and_practical/Cover-Story-Part-2-Liquid-Level-Measurement-Options-In-the-CPI_4010.html
July 15, 2008
The incorporation of floating solids into liquids is a common challenge throughout the chemical process industries (CPI) in operations ranging from polymerization reactions to fermentation processes and water treatment. Yet, it has received much less attention in comparison to processes involving heavy solids that tend to settle. Both established and recently proven design recommendations for incorporating...
http://www.che.com/technical_and_practical/Feature-Report-Incorporate-Floating-Solids-Into-Liquids_4011.html
July 15, 2008
With the increasing demand for security, drums and other liquid vessels that contain valuable or hazardous liquids can be retrofitted with a simple dispensing-valve system that virtually eliminates leakage and ensures product integrity Although the storage, security, handling and dispensing of both potentially hazardous and valuable liquids can present some measure of risk, these risks can be reduced...
http://www.che.com/technical_and_practical/Special-Report-Closed-Liquid-Dispensing-Secure-Container-Contents-While-Reducing-Risk_4012.html
July 15, 2008
Workers in the chemical process industries (CPI) would certainly benefit from the "perfect" glove that would be thick enough for thermal insulation, thin enough to promote dexterity and tough enough to protect workers from cuts and abrasion. The glove would also protect against all known chemicals and be offered at a minimal price. This perfect glove, however, does not exist. Processors and...
http://www.che.com/technical_and_practical/Finding-the-Right-Gloves-To-Fit-the-Application_4014.html
June 15, 2008
Compressed air is often referred to as the fourth utility, and yet for an upstart business or process there is no commercial infrastructure that provides a core supply as exists with gas, electricity and water. When a need for compressed air is identified in planning and feasibility studies, it is necessary for the owners of the process or business to develop and maintain their own systems. Often the...
http://www.che.com/technical_and_practical/Cover-Story-Part-1-Compressed-Air-Exploring-the-Need-For-Temporary-Systems_3945.html
June 15, 2008
Compressed air is your most expensive utility. This is a fact that has been documented time and time again. It takes 7 to 8 hp of electricity to produce 1 hp in an airtool. In many plants, the compressed air system is the largest user of electricity. Yet, despite rising utility rates, compressed-air-system efficiency is frequently misunderstood or too often overlooked. Every plant or processing facility...
http://www.che.com/technical_and_practical/Cover-Story-Part-2-Compressed-Air-Your-Most-Expensive-Utility_3946.html
June 15, 2008
This sixth and final part of a series of articles [ 1 – 5] on piping for process plants discusses practical issues of leak testing and verification of piping systems. Leak Testing Leak testing and pressure testing are often used synonymously. However, pressure testing is a misnomer when referring to leak testing of piping systems. By definition, a pressure test is the procedure performed on a relief...
http://www.che.com/technical_and_practical/Engineering-Practice-Piping-for-Process-Plants-Part-6-Testing-and-Verification_3948.html
June 15, 2008
Applications Dehumidification by cooling or dessication has a variety of applications, including: Preventing moisture regain. Nearly all materials have some affinity for moisture based on surface characteristics and the amount of surface exposed to humid air. Moisture regain occurs when moist particles stick together. Preventing condensation. Air holds water vapor in proportion to its temperature. Cold...
http://www.che.com/technical_and_practical/Facts-at-Your-Fingertips-Humidity-Control_3949.html
June 15, 2008
In many plants that batch-blend bulk products, weigh batching is a manual, time-consuming operation in which ingredients are weighed individually before being discharged to a blender or some other process vessel. A significant number of such plants could benefit from the installation of an automated weigh-batching system. For small as well as large operations, an automated weigh-batching system can pay for...
http://www.che.com/technical_and_practical/Solids-Processing-Automating-Your-Weigh-Batching-System_3953.html
June 15, 2008
An automated spreadsheet method can quickly help minimize fresh hydrogen consumption while maximizing hydrogen recovery and reuse in petroleum refineries and petrochemical complexes In petroleum refineries and petrochemical complexes, there are many hydrogen consumers, such as hydrotreaters, hydrocrackers, isomerization units and lubricant plants. There are also hydrogen producers, such as hydrogen plants...
http://www.che.com/technical_and_practical/Engineering-Practice-Hydrogen-Pinch-Analysis-Made-Easy_3972.html
June 15, 2008
One of the earliest applications for zirconium in the chemical process industries (CPI) is for sulfuric acid service. Used commonly during the manufacture of chemicals as a catalyst, dehydrating agent, absorbent, or an oxidizing or reducing agent, sulfuric acid is one of the most important and the largest produced inorganic chemicals in the world. Zirconium has been chosen for sulfuric acid environments...
http://www.che.com/technical_and_practical/Zirconium-and-its-Alloys-For-Extreme-Sulfuric-Acid-Applications_3973.html
May 15, 2008
  Carbon capture and storage (CCS) is an area of technology that has received national and international attention. CCS is seen by some as a way to reduce carbon dioxide (CO2) emissions into the atmosphere and thereby decrease the threat of global warming. Consequently, proponents have increased pressure on state and federal governments to make such reductions mandatory. Although the benefits of CCS...
http://www.che.com/technical_and_practical/Technology-Showcase-Carbon-Capture-and-Storage_3856.html
May 15, 2008
To many, the concept of a "smart plant" involves integrating critical process subsystems and instrumentation with the goal of streamlining operations, increasing production and, simply put, making more money. But looking at the bigger picture, the true goal of having an integrated smart plant isn’t solely automating processes or capturing knowledge electronically. The ultimate goal is...
http://www.che.com/technical_and_practical/An-Integrated-Approach-to-Industrial-Security_3861.html
May 15, 2008
Accurate temperature measurement is not difficult. It does, however, require you to think about accuracy from specification and selection, all the way up to installation and operation of your temperature-measurement sensor. There are opportunities to improve accuracy during each of these phases, as well as opportunities to accidentally undermine all of your previous improvement efforts. Determining the...
http://www.che.com/technical_and_practical/Warming-Up-to-Accurate-Temperature-Measurement_3862.html
May 15, 2008
  FIGURE 1. In a typical system for wastewater treatment, the liquid feed is introduced at the top of the column and steam is introduced at the bottom In recent years, steam strippers have become integral parts of industrial plant operations. The goal when designing these types of columns is to have reliable operation for as long as possible. This article details the methodology used when designing...
http://www.che.com/technical_and_practical/Engineering-Practice-Designing-Steam-Stripping-Columns-for-Wastewater_3863.html
May 15, 2008
Most common acids can be stored in horizontal or vertical ASME-type tanks, as shown in the figures to the right, or vertical API-type tanks. Horizontal, carbon-steel ASME-type tanks of 10,000 — 40,000 gal capacity should have a plate thickness of 3/8 in. with dished heads of the same thickness. The thickness includes a corrosion allowance of 1/4 in., which provides a tank life of 15 — 20 years...
http://www.che.com/technical_and_practical/Facts-at-Your-Fingertips-Acid-Storage_3864.html
May 15, 2008
  Effective use of capital in the ownership and management of manufacturing assets is critical to the financial performance of companies in the chemical process industries (CPI). Many of these companies use benchmarking in compliance with applicable laws and antitrust regulations to compare, identify, and adopt industry best practices that drive the capital effectiveness of their project development...
http://www.che.com/technical_and_practical/Benchmarking-for-Success_3865.html
May 15, 2008
A. Alexander and F. Muzzio, Rutgers University Proper blender selection can improve the mixing of bulk solids. Be sure to consider post-blending segregation problems Mixing and blending of bulk solids occurs frequently in many industrial processes. Though small-scale mixing and blending functions were in use back in the early days of man (for example, mixing flour, salt, yeast and water to make bread)...
http://www.che.com/technical_and_practical/Solids-Processing-Blender-Selection-And-Avoidance-of-Post-Blender-Segregation_3867.html
May 5, 2008
Demands in the chemical processing industry to reduce energy consumption and carbon footprint are higher than ever before.  Correct sizing and selection of vacuum systems can contribute significantly to optimizing throughput and efficiency, thus reducing energy consumption, capital and running costs, and pollution. This article compares traditional ‘wet’ vacuum systems, such as steam...
http://www.che.com/technical_and_practical/Environmentally-Friendly-Dry-Vacuum-Pumps-Save-Energy-with-the-Lowest-Cost-of-Ownership-in-Chemical-and-Biofuel-Processes_3848.html
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