Archives :: Technical & Practical

Displaying 261 - 280 of 527 stories.
August 1, 2010
To unearth the fundamental causes of vibration-related pump troubles, pump end-users and original equipment manufacturers (OEMs) typically have relied on a concise array of vibration field-test parameters. Conventional trial-and-error vibration troubleshooting methods often fail to achieve the longterm, trouble-free pump operation sought, yet they can be time-consuming and increasingly costly to apply...
http://www.chemengonline.com/technical_and_practical/Fine-tuning-Pump-Vibration-Diagnostics_5899.html
July 1, 2010
In 1952, 37 companies established Fractionation Research, Inc. (FRI). Most of those original members are now gone or absorbed by other companies. Nevertheless, their goal was to study distillation in columns having diameters and heights that were similar to industrial columns. The columns of the world were getting larger and more numerous and were too often being designed using bench-top apparatuses and...
http://www.chemengonline.com/technical_and_practical/Seeking-out-difficult-situations_5800.html
July 1, 2010
Pinch analysis emerged as a systematic design tool during the energy crisis of the late 1970s, particularly for the optimization of heat-exchanger networks and other heat-recovery systems [ 1 ]. Since then, ongoing breakthroughs in the use of pinch analysis have helped to establish mass- and property-integration techniques to assist with waste-minimization efforts [ 2, 3 ]. More recently, pinch analysis...
http://www.chemengonline.com/technical_and_practical/Optimize-Shift-Scheduling-Using-Pinch-Analysis_5806.html
July 1, 2010
Acoustic coupling in industrial furnaces is an issue that appears to have become more prevalent as designs increase the volumetric heat density of furnaces, and burner technology is required to meet more-stringent emission requirements. The problems associated with acoustic coupling appear in the form of either large oscillations in the heater pressure or tonal and high-level emitted noise. Although the...
http://www.chemengonline.com/technical_and_practical/Controlling-Acoustic-Coupling_5807.html
July 1, 2010
Relief systems are the last line of defense for chemical process facilities. Verifying their capability to safeguard equipment integrity becomes important as process plants age, increase their capacities to adjust to new market requirements, undergo revamps or face new environmental regulations. In the past, approximately 30% of the chemical process industries’ (CPI) losses could be attributed, at...
http://www.chemengonline.com/technical_and_practical/Aging-Relief-Systems-Are-they-Working-Properly_5808.html
July 1, 2010
Storage of bulk materials in hoppers, bins and silos is ubiquitous in the chemical process industries (CPI), and so are the challenges that go along with it. Flow stoppage (bridging or arching), variability in mixture composition (de-mixing or segregation), erratic flow, uncontrolled flow (flooding), discharge-rate limitations and structural failures are not uncommon. While the impact of vessel geometry is...
http://www.chemengonline.com/technical_and_practical/Using-Inserts-to-Address-Solids-Flow-Problems_5810.html
June 29, 2010
This table supports the article Using Inserts to Address Solids Flow Problems, CE, July 2010, pp. 32–37. U. S. Patents       Patent # Date Title Inventors 1,731,675 Oct. 15, 1929 Sawdust Feeder McCoy, John C. 2,843,274 Jul. 15, 1958 Flow Control Baffle for Granular Material Williams, Gael M. 3,166,222 Jan. 19, 1965 Vibratory Bin Agitator Schrader, Preston H. 3,794,386 Feb. 26, 1974...
http://www.chemengonline.com/technical_and_practical/A-cross-section-of-insert-patents_5857.html
June 1, 2010
Containing fugitive emissions of volatile organic compounds (VOCs) and hazardous air pollutants (HAPs) is a challenge to the chemical process industries (CPI). It has been estimated that these industries account for half of all fugitive emissions, and 60% of these emissions are the result of valve stem leaks. In addition to environmental benefits, effectively containing these emissions can yield...
http://www.chemengonline.com/technical_and_practical/Containing-Fugitive-Emissions_5718.html
June 1, 2010
I have 70 supervisors. It sometimes feels like I am pulled in 70 different directions — north, south, east, west, up, down and inside-out. But even after two years at this job, I can still hold my hand steady — if I put it in a vice. Nevertheless, I feel that I have the best job in the distillation world; I am technical director at Fractionation Research, Inc. (FRI; Stillwater, Okla....
http://www.chemengonline.com/technical_and_practical/Propelling-distillation-research_5720.html
June 1, 2010
Incorporating fire safety into plant design takes on two fundamental goals: to prevent the occurrence of fire and to protect the initially uninvolved piping and equipment long enough for operations personnel to perform their duties and for emergency responders to get the fire under control. While it is impractical to completely eliminate the potential risk of an accidental fire in a complex process-plant...
http://www.chemengonline.com/technical_and_practical/Piping-Design-for-Hazardous-Fluid-Service_5721.html
May 1, 2010
Neptune Chemical Pump This self-priming pump is available for water and wastewater processing The Series 7000 mechanically actuated, diaphragm metering pumps (photo) can handle viscosities in excess of 5,000 cP and can pump chemicals that tend to off-gas (such as sodium hypochlorite) without binding. All models provide suction lift to 20 ft. Maximum capacities range from 15 to 300 gal/h with adjustble...
http://www.chemengonline.com/technical_and_practical/Focus-on-Pumps_5633.html
May 1, 2010
Gooch Thermal Systems Spiral plate heat exchangers are ideal for cooling slurries and viscous fluids. The performance of these units is characterized by increased turbulent heat transfer, reduced fouling, greater ease of maintenance, and more compact size compared to many competing options. In a spiral plate heat exchanger, the hot fluid enters at the center of the unit and flows from the inside outward...
http://www.chemengonline.com/technical_and_practical/Spiral-Plate-Heat-Exchangers-Sizing-Units-for-Cooling-Non-Newtonian-Slurries_5634.html
May 1, 2010
Wireless communications have great potential in the chemical process industries (CPI) because they do away with complex and costly cable installations and enable completely new applications. And while a recent wave of successful demonstrations has begun to emerge in the CPI (for more, see CE, Nov. 2009, p. 17–23), a number of hurdles stand in the way of a completely wireless Utopia. In most cases...
http://www.chemengonline.com/technical_and_practical/Wireless-Communication-in-Hazardous-Areas_5639.html
May 1, 2010
A virtually endless number of process options are available for agglomerating powders in the chemical process industries (CPI). These processes can be divided into two main categories: agitation and compression. Agglomeration by agitation includes granulation processes, such as fluidized-bed, disc, drum and mixer granulators. Agglomeration by compression includes compaction processes, such as tabletting...
http://www.chemengonline.com/technical_and_practical/Agglomeration-Technology-Equipment-Selection_5641.html
April 1, 2010
Non-chemical methods for conditioning water for use in cooling towers and boilers have been investigated, marketed and installed for over 100 years. In light of the recent incentives to “go green,” these methods offer engineers, operators and owners the option of replacing corrosive, toxic chemicals with physical or mechanical processes that claim to produce the same or superior results to...
http://www.chemengonline.com/technical_and_practical/Non-Chemical-Water-Treatment_5565.html
April 1, 2010
The use of appropriate hazardous-area lighting in the chemical process industries (CPI) is a key factor when it comes to improving overall plant safety and worker productivity, and supporting the best maintenance practices. The potentially hazardous conditions associated with many industrial settings place high demands on the lighting fixtures, and it is essential that pathways, walkways and stairways in...
http://www.chemengonline.com/technical_and_practical/A-Safety-Centered-Approach-To-Industrial-Lighting_5566.html
April 1, 2010
As heat exchangers age, their tube thickness decreases because of erosion, corrosion or a combination of both. Installing thin sleeves in tubes in which the tube walls have become so thin that failure is imminent is a maintenance technique useful for extending heat exchanger life. One should consider sleeving when: (1) it would be very costly to replace aged exchangers because of the installation position...
http://www.chemengonline.com/technical_and_practical/Full-Length-Sleeving-for-Process-Heat-Exchanger-Tubes_5568.html
April 1, 2010
The stirred tank reactor with rotating mixers remains the backbone of the chemical process industries (CPI). While mixing is considered a mature technology, it is clear that continued technological development is necessary to achieve the state-of-the-art design demanded by ever-increasing efficiency needs. As worldwide competition forces the CPI to increase the profitability of their production plants, it...
http://www.chemengonline.com/technical_and_practical/Mechanical-Design-Aspects-for-High-Performance-Agitated-Reactors_5572.html
April 1, 2010
Particulate systems are everywhere; they are responsible for bright red sunsets, the texture of chocolate and the rate of drug delivery in the human body. Particulate processing and size control originated back in prehistoric times where mixtures of pigments were finely pulverized and used in the painting of cavern walls. From those primitive beginnings, the use and processing of particulate matter has...
http://www.chemengonline.com/technical_and_practical/Particle-Sizing-Across-the-CPI_5574.html
March 1, 2010
Powder agglomeration is used in a wide variety of the chemical process industries (CPI), and a virtually endless number of process options are available. Selection requires engineers to make a substantial number of design decisions, such as the choice between wet or dry processing, the intensity of mixing and shear rates, continuous versus batch operation, cross contamination of products and ease of...
http://www.chemengonline.com/technical_and_practical/Agglomeration-Technology-Mechanisms_5497.html
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