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Understanding Compressible Flow
Nov 08 2010 01:40 PM |
rxnarang
in Fluid Flow
Understanding the flow of compressible fluids in pipes is necessary for a robust design of process plants. The main difference between incompressible fluid, like water, and compressible fluid, vapor, is the greater change in pressure and density. This...
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compressible, flow, understanding
Forms of Corrosion
Nov 08 2010 01:20 PM |
Chris Haslego
in Maintenance and Repair
Corrosion is costly! If you doubt this, then you probably have never been bitten by the "corrosion bug". Imagine specifying Titanium for 10 brand new heat exchangers or reactors and later realizing that the processing stream has fairly high concentra...
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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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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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Estimating Heat Capacities for Solutions with D...
Nov 08 2010 01:40 PM |
Chris Haslego
in Calculations and Tips
Often times it is necessary to find the heat capacity for solutions with dissolved solids. A quick estimation method was proposed by Dimoplon in 1972. The proposed expression is:Cp(soln) = W1 Cp(solid) + W2 Cp(water)Eq. (1)where:Cp(soln) = Heat capacit...
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Flow Through Orifice Plates in Compressible Flu...
Nov 08 2010 01:40 PM |
dkirk
in Safety and Pressure Relief
The calculation of compressible flow through orifice plates at high dP (critical flow) appears to be carried out incorrectly in most instances. This flow condition is often encountered on gas plants, compressor stations and pipelines where orifice plat...
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high, pressure, orifice, flow and 2 more...
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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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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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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ChE Plus Has Moved
Dec 29 2010 10:10 PM |
Chris Haslego
in Articles
ChE Plus has moved to the Community section of our website. Here, we'll explain how to access your ChE Plus files in our new interface. If you do NOT have an account set up in our community section, read below about how to gain access.Already Have a...
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Terms of Use and Legal Restrictions
Feb 17 2011 11:50 PM |
Chris Haslego
in Articles
ATTENTION: PLEASE READ THESE TERMS CAREFULLY BEFORE USING THIS WEB SITE. USING THIS WEB SITE INDICATES THAT YOU ACCEPT THESE TERMS. IF YOU DO NOT ACCEPT THESE TERMS ("TERMS"), DO NOT USE THIS WEB SITE. Use of Site. The Chemical Engineers' Resource Pa...
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Submission Received
Aug 24 2011 10:50 PM |
Chris Haslego
in Articles
Thank you for your submission. We've received your information and will be in contact with you shortly.
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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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valve, sizing, selection
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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steam, tracing, calculation
Ammonia: The Next Step
Nov 08 2010 01:20 PM |
Guest
in Process and Reactions
Steam reforming of hydrocarbons for ammonia production was introduced in 1930. Since then, the technology has experienced revolutionary changes in its energy consumption patterns. Ranging from an early level of 20 Gcal/tonne (79.4 MBtu/tonne) to about...
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Design Considerations for Shell and Tube Heat E...
Nov 08 2010 01:30 PM |
Chris Haslego
in Heat Transfer
When preparing to design a heat exchanger, do you ever wonder where to start? You've done it before, but you hate that feeling of getting half way through the design and realizing that you forgot to consider one important element.The thought process i...
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Energy Conservation in Distillation
Dec 13 2010 09:23 AM |
Chris Haslego
in Separation Technology
The preferred method of separation in the chemical industry, distillation, is a very energy intensive process. Fine tuning your distillation columns (and in some cases, making major changes) can save your company thousands of dollars a year or more. Co...
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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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product, shear and 3 more...
Hollow Fiber Membranes
Nov 08 2010 01:20 PM |
Chris Haslego
in Separation Technology
Membrane separation processes has become one of the emerging technology which undergo a rapid growth during the past few decades. It has drawn the world attention especially in the separation technology field, one of the chemical engineers' specialty w...
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Air Leak Testing Prior to Commissioning
Nov 08 2010 01:30 PM |
Chris Haslego
in Maintenance and Repair
Our message board is a constant source of great advice and information for all of our users. Some times, an especially useful discussion takes place that deserves a little extra attention. The inquiry and reply shownin this articlecan benefit process e...
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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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Relief Valves: "What Can Go Wrong" Scen...
Nov 08 2010 01:30 PM |
pleckner
in Safety and Pressure Relief
What can go wrong in a chemical facility? Plenty! A report in the August 2000 issue of CEP1 shows that operator error or poor maintenance was the leading of cause of accidents for unfired pressure vessels eight years running. The ProblemAccidents not o...
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Rupture Disks for Process Engineers - Part 2
Nov 08 2010 01:30 PM |
pleckner
in Safety and Pressure Relief
Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. This part will discuss how to size the rupture disk. Subsequent parts will include how to set the burst pressure...
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Rupture Disks for Process Engineers - Part 3
Nov 08 2010 01:30 PM |
pleckner
in Safety and Pressure Relief
Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. Part 2 discussed how to size the rupture disk. In this part, I will cover how to set the burst pressure. Subsequ...
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Rupture Disks for Process Engineers - Part 4
Nov 08 2010 01:30 PM |
pleckner
in Safety and Pressure Relief
Part 1 of this series on rupture disks for Process Engineers covered why you use a rupture disk and when you might want to use this device. Part 2 discussed how to size the rupture disk. Part 3 discussed how to set the burst pressure. In this part, I w...
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