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Hi, qazx No need for using structured packings in VDU stripping section, since it doesn't affect flash zone operating conditions. I would expect, in such case, very serious fouling/flooding problems. Well designed and properly installed trays are more than enough. MaNaTMoS P.S. Ensure that...

Hello, Eng-Tips Can anyone suggest website or write down a consequent formulas on exact way how FeS is formed in CDU overhead coolers? When looking at Pourbaix diagram of Iron, several corrosion/solution/stabile Fe areas can be noticed. Please describe this phenomenon which causes serious...

Very good, my friend; as a first step, I'm giving you a big shiny star for the right decision. I'm a passionate tobacco guy also, but I'm affraid 100 millions of stars wouldn't help me to quit smoking. Maybe I should try with drugs? Wish you good health, MaNaTMoS :o)

Hi, Orenda Desalted crude has less than 20ppm of chlorides (average). Drastic difference between desalter waste water and CDU overhead sour water chlorides content comes from, in my opinion, organic chlorides. The problem is impossibility of desalter to remove organic chlorides due to their...

BTW, friend, you smoke too much! :o)

Thanks, 25362 Concerning the naphthenic acid analysis and theory, I've manage to find the following (according to several sources, all available online - "CorrosionSource", "SetLaboratories", "AaChE" etc.): 1) The ASTM procedures for Total Acid Number (TAN) - also called neut number - were not...

Hello, In several articles I have been reading, the subject was the difference between total acid number (TAN), determined by ASTM standard method, and naphthenic acid number (NAN), determined by mysterious (to me) "naphthenic acid titration test - NAT". What kind of test is it? Can it be found...

Thanks, 25362. Since it is impossible to remove them through desalting of crude oil, what further actions should we take? Corrosion and fouling problems become drastically bigger, due to salt decomposition to form HCl. What percentage of total chlorides content goes on organic chlorides in raw...

Hello, Eng-Tips Does anyone know origin of organic chlorides in crude oil? What is the average organic/anorganic chlorides ratio in crude (REB, for example), and is there any relation between crude origin and organic chlorides content? Which chemical compounds/species of chlorine are mostly...

Hello, Eng-Tips What are the most important parameters when designing CDU overhead waterwash system? I'm interested in every detail - wash water quality, injection point, water dosing control scheme, water distribution arrangement (nozzles) etc. We use NH3 for overhead acid neutralisation and...

Sorry, there was a writing error in the previous post (about "first water dropplet"); I wanted to say - high acidity and LOW pH. Maybe I just work too much. :o) Regards

Dear Ponderer, there will always be "cold" (local) spots at the inlet of 1st stage condenser, where corrosion will take place, caused by high pH value of so called "first water droplet". To avoid this, continuous waterwash injection point should be moved to the inlet of 1st condenser, at...

Dear Jeff, thank you for your reply. Crude assays and API tables represent good source for this kind of information, but I was looking for something else, actually. Are there any ways to calculate and predict pour point values for different products/fractions, based on API gravity/ASTM...

Hello to members and visitors, I have one rather general question to ask, but I'm interested in every detail I can find out. The question is about pour point values of vacuum distillation unit products: LVGO, HVGO, TGO (or stripped part of vacuum resid) and vacuum residue itself, from different...

Thanks, I have seen this web site before, it's very good. And Mr Kojak is dangerous dude, I can say that for sure:o)

What is the best way to control low-pressure steam (3.5 barG) flow to the air preheaters or steam reboilers channel head? Is it correct to install FRC on the steam inlet side or condensate outlet side? If control valve is on the steam inlet side, the pressure of steam condensation may be...

Hello, Does anybody use pilot operated PSV in hydrocracking service? Is there any drawbacks, like sensing line plugging? We need to make decision between ordinary PSV and pilot-operated PSV in hydrocracker plant. I would appreciate any useful comment and experienced guidelines. Thank you, MaNaTMoS

Hmm, it reminds me of similar problem we have had just a few months ago. Check for microbial growth and water content (emulsified + dissolved); compare the IFT values before and after "stratification".

Hey, dear Mr Phex "Days of Cheese" are traditional but random-day-choosed holiday; it's because we cannot afford to eat so much cheese all the time. Since I had a nice pay cheque last month, I've decided to buy 100kg (over 200lb) of almost all main sorts of cheese. During this holiday, we are...

Good day to everyone, I have one interested e-location to recommend: http://www.mcnallyinstitute.com/home-html/Technical_paper_index.html A massive amount of very practical and instructive information about lots of topics around pumps and hydraulics. Happy 12-15. of july, "The Days of...