Search results for query: *

Regarding the method of calculating the hydraulic network, I have actually programmed the Hardy-Cross method, which is a "beginner's" method, not too accurate because of the restrictive assumptions. This can be implemented in Excel (very tedious even for small problems; besides the spreadsheet...

For large diameter particles (such as your seeds) where fluidization is not stable, I would look into spouted beds, which have been field-proven in such applications for over 3 decades. There is a description of this technique in Perry. For design details, such as maximum spoutable bed depth...

If you want good flow regulation, a butterfly valve is generally a poor choice. The flow characteristics are just not suited to such a task. That's why one should specify a control valve if you want really close regulation. A better choice than the butterfly is a globe valve for reasonably...

Well, this time I uploaded it to Engineering.com Hope it shows up for you. Umesh Mathur

Sorry, the report did not get uploaded properly. Here it is:

fifi121: Since you cannot condense methane, you must have an overhead vapor leaving the accumulator. The overhead liquid distillate would need to be a draw from the accumulator. I ran a simple simulation and have attached the report. This simulation contains many assumptions, such as feed...

bduane: If you're still interested, please confirm and I'll post a generic method on how to use the vendor's polytropic head and efficiency curves for ANY gas.

Several steps are required. I would summarize them as follows: (1) Expert analysis and fix-up of all basic regulatory controls - loop configuration logic, instruments, analyzers, loop tuning, valve performance and so forth. (2) Model-predictive, multivariable constrained control, referred to...

You need to study the basics of VLE thermodynamics if you want to learn to do such calculations yourself. I suggest the following book by the recognized maestros in this field: "Computer Calculations for Vapor-Liquid and Liquid-Liquid Equilibria" by Prausnitz, et al (Prentice Hall, 1980)...

Hi, James: The best reference for step-by-step calculations of this type is: Hewitt, G. F., G. L. Shires, and T. R. Bott: "Process Heat Transfer", pp 275-285 (CRC Press, 1994). This is an encyclopedic work written by the leading authorities in the field, surely a worthy successor to Kern's...

Have you checked the DECHEMA data book series for experimental VLE data? This is a voluminous set of books that lists all experimental data reported in the open literature that have been measured up to some date preceding the publication. These books are expensive, but most respectable...

In my own experience, it is impossible to measure flow with any reliability in a two-phase flow line. The solution is to back up to upstream points until you find a segment where you have a single phase and do the measurement there. For example, in a furnace, measure the flow before the feed...

Hi, EmmanuelTop: Since the column pressure is 6.2 barg, the pressure downstream of both FCVs will be only slightly higher than this value, and could be calculated by any competent software package. Also, you need to be careful about static head effects in doing such calculations. You seem to...

I don't see any sketch, so it's not clear what the "Hot C4" and "Cold C4" streams mean.

LaSalle1940: Generally, the absorption equation is attributed both to Kremser (1930) and Souders-Brown (1932). You'll find it more easily if you use Kremser's name. A good plot of the Kremser-Souders-Brown equation is available in the 11th edition of GPSA's Engineering Data Book, Fig.19-48...

In my opinion, the only way to determine the best option to improve fractionation is to use a calibrated column simulation model to provide reliable guidance. The model calibration must be done against averaged on-line data (gathered over at least a few hours of steady operation, with lab...

The best book for your purposes, in my opinion, is "Petroleum Processing" by R.J. Hengstebeck of Amoco (McGraw-Hill, 1959). It's out of print but libraries should carry it. This is an incredibly lucid book, written by one of the masters. I studied with Professor Nelson and his "Petroleum...

In my opinion, the only way to determine the full effect of changes in pumparound rates is to use a calibrated column simulation model. The calibration must be done against averaged on-line data (gathered over at least a few hours of steady operation, with lab samples gathered for product...

eBay is a great place for old books.

dcasto: I'm not sure that the formulas you have provided are not approximations. I ran a few numerical examples and found that they do not match the more rigorous formula for compressors within what I consider engineering accuracy (1-2%).