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Centrifugal Pumps: Basic Concepts of Operation,...

Nov 08 2010 11:30 AM | Mukesh Sahdev in Fluid Flow

The operating manual of any centrifugal pump often starts with a general statement, "Your centrifugal pump will give you completely trouble free and satisfactory service only on the condition that it is installed and operated with due care and is prope...

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Specifying A Liquid-Liquid Heat Exchanger

Nov 07 2010 06:00 PM | Chris Haslego in Heat Transfer

As an engineer, specifying heat exchangers for procurement is an important step in the successful execution of any heat transfer or energy conservation project. Early recognition that there are many different heat transfer technologies available can he...

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Valve Sizing and Selection

Dec 05 2011 03:20 PM | Chris Haslego in Fluid Flow

Sizing flow valves is a science with many rules of thumb that few people agree on. In this article I'll try to define a more standard procedure for sizing a valve as well as helping to select the appropriate type of valve. **Please note that the corr...

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Product Viscosity Versus Shear

Feb 11 2013 06:50 PM | Steve Hall in Fluid Flow

Many products are known to be “shear thinning,” which is a term given to materials that exhibit a decrease in viscosity when force is exerted. The viscosity of pseudoplastic fluids decreases with shear, and recovers quickly when the shear is removed. Examples include paper pulp in water, latex paint, molasses, and pharmaceutical suspensions (such as certain cough syrups).



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A Students Guide to Refining

Nov 08 2010 01:20 PM | Chris Haslego in Energy

Distillation is the first step in the processing of crude oil and it takes place in a tall steel tower called a fractionation column. The inside of the column is divided at intervals by horizontal trays. The column is kept very hot at the bottom (the c...

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Jacketed Vessel Design

Nov 08 2010 01:20 PM | Guest in Heat Transfer

Jacketing a process vessel provided excellent heat transfer in terms of efficiency, control and product quality. All liquids can be used as well as steam and other high temperature vapor circulation. The temperature and velocity of the heat transfer me...

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Chemistry of Photography

Nov 08 2010 01:30 PM | Chris Haslego in Other Topics

While it is easy to make comparisons between the pupil of the eye and the f-stop of a camera or between the retina of the eye and photographic film, once we get past the basic similarities of the optics of the two systems, comparisons begin to rapidly...

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Plate Heat Exchangers: Preliminary Design

Nov 08 2010 12:50 PM | Chris Haslego in Heat Transfer

Numerous articles have been published regarding the advantages of compact heat exchangers. Briefly, their higher heat transfer coefficients, compact size, ease of service, cost effectiveness, and their unique ability to handle fouling fluids make compa...

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Packed Column Design

Nov 08 2010 01:20 PM | Chris Haslego in Separation Technology

Designing a randomly packed column is a subtle blend of art and science. Packed columns are most frequently used to remove contaminants from a gas stream (absorption). However, packed columns can also be used to remove volatile components from a liquid...

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Cooling Towers: Design and Operation Considerat...

Nov 08 2010 12:50 PM | Chris Haslego in Heat Transfer

Cooling towers are a very important part of many chemical plants. They represent a relatively inexpensive and dependable means of removing low grade heat from cooling water.The make-up water source is used to replenish water lost to evaporation. Hot wa...

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Correlations for Convective Heat Transfer

Nov 08 2010 01:20 PM | bspang in Heat Transfer

In many cases it's convenient to have simple equations for estimation of heat transfer coefficients. Below is a collection of recommended correlations for single-phase convective flow in different geometries as well as a few equations for heat transfer...

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Using Equivalent Lengths of Valves and Fittings

Nov 08 2010 01:20 PM | pleckner in Fluid Flow

One of the most basic calculations performed by any process engineer, whether in design or in the plant, is line sizing and pipeline pressure loss. Typically known are the flow rate, temperature and corresponding viscosity and specific gravity of the f...

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Centrifugal Pumps: Understanding Cavitation

Nov 08 2010 01:30 PM | Mukesh Sahdev in Fluid Flow

Operating a pump under the condition of cavitation for even a short period of time can have damaging consequences for both the equipment and the process. Operating a pump at low flow conditions for an extended duration may also have damaging consequenc...

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U in Heat Exchangers

May 10 2012 08:19 AM | bspang in Heat Transfer

Typical values of U are useful for quickly estimating the required surface area. The literature has many tabulations of such typical coefficients for commercial heat transfer services.



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Thermodynamic and Transport Properties of Water...

Nov 08 2010 01:20 PM | bspang in Physical Properties

Water is not only one of the most common substances and indispensable to life, it's also one of the most important media in engineering applications. Steam engines with water as the working fluid were at the beginning of the industrial revolution. The...

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Pyrophoric Iron Fires

Nov 08 2010 01:30 PM | Mukesh Sahdev in Safety and Pressure Relief

At one time or another, most refineries experience spontaneous ignition of iron sulfide either on the ground or inside equipment. When this occurs inside equipment like columns, vessels, and tanks and exchangers containing residual hydrocarbons and air...

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Pinch Technology: Basics for Beginners

Nov 08 2010 01:30 PM | Mukesh Sahdev in Heat Transfer

While oil prices continue to climb, energy conservation remains the prime concern for many process industries. The challenge every process engineer is faced with is to seek answers to questions related to their process energy patterns. A few of the fre...

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Crystallization

Nov 08 2010 01:30 PM | Chris Haslego in Separation Technology

Crystallization refers to the formation of solid crystals from a homogeneous solution.  It is essentially a solid-liquid separation technique and a very important one at that. Crystals are grown in many shapes, which are dependent upon downstream proc...

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Making Decisions with Insulation

Nov 08 2010 12:30 PM | Chris Haslego in Heat Transfer

Many people overlook the importance of insulation in the chemical industry. Some estimates have predicted that insulation in U.S. industry alone saves approximately 200 million barrels of oil every year. While placing insulation onto a pipe is fairly...

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Experienced Based Rules of Chemical Engineering

Nov 08 2010 01:00 PM | Chris Haslego in Calculations and Tips

Experience is typically what turns a good engineer into a great engineer. An engineer that can look at a pipe and a flowmeter and guess the pressure drop within 5%. Someone who can at least estimate the size of a vessel without doing any calculations....

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Refinery Planning and Optimization

Nov 08 2010 01:10 PM | Mukesh Sahdev in Energy

Modern optimization techniques have challenged organizations to rethink the way they conduct business both internally and externally, i.e. how efficiently and effectively their entire supply chain is managed. Supply Chain Management (SCM) is one such b...

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Basics of Injection Molding

Nov 08 2010 01:30 PM | Chris Haslego in Bulk Solids

Making polymers is a fantastic science.   Then there is the matter of shaping the plastic into useful objects....another fantastic science.  One of the most common methods of shaping plastic resins is a process called injection molding.  Injection m...

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Relieve Valve Set Pressures

Nov 08 2010 01:20 PM | pleckner in Safety and Pressure Relief

As the title of this column implies, I intend to present various topics related to Process Engineering Design based on my knowledge and experiences. I will convey what approaches I think you should be taking. I will stress "the correct way" so don't ex...

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Steam Tracing with MS Excel

May 24 2012 06:50 PM | adelange in Heat Transfer

Heat tracing is used to prevent heat loss from process fluids being transported in process fluid pipes, when there is risk of damage to piping, or interference with operation such as fouling or blockage, caused by the congealing, increase in viscosity, or separation of components, in the fluid below certain temperatures, or when there is risk of formation of corrosive substances or water due to condensation in corrosive services.

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Basics of Industrial Heat Transfer

Nov 08 2010 01:30 PM | Chris Haslego in Heat Transfer

Heat transfer is one of the most important industrial processes. Throughout any industrial facility, heat must be added, removed, or moved from one process stream to another. Understanding the basics of the heart of this operation is key to any enginee...

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