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What are the differences between a counter-current and co-current exchanger for design aspect point of view? The main reason for my question is, we are thinking to change the Debutanizer exchanger hot stream side to avoid further corrosion. The current configuration is a counter current and...

How can I calculate my pumps performance in parallel conditions? In our LPG system we have two pumps (motor/turbine), usually motor pump is running most of the time. The common discharge line will split into tow streams one to rundown (LPG to storage) and the other one back to the column as a...

Hello Everybody, How I can define if such service is a wet H2S service? Is it as a function of partial pressure of H2S at given temperature and pressure? What is the definition of Wet H2S service (wet sour gas)?

In our FCC unit we have a variable speed centrifugal wet gas compressor, the suction pressure is in the range of (0.7 to 0.9) barg (1.7 to 1.9 barA). My question is what will be the effect if we try to run at lower suction pressure? Below 0.65 barg. In other word, is there is a minimum suction...

Our strategy is to minimize feed inventory, one example we are currently running with three FCC charge pumps in order to maintain the required feed throughput into the unit. The current Tank level is 9.8 meter and we would like to reduce the TK level to 6.7 meter, my question is what will be the...

Hello ALL, I'm trying to calculate the dew point temperature on the FCC Fractionators tower in order to know where we stand; our top pressure is fluctuating between 0.7 to 1.1 barg. We also have noticed that the pressure drop across the overhead fin fan banks has increased from 0.20 to 0.5...

The frequency of our FCCU Wet Gas Compressor turbine fouling has increased sharply this year. We have conducted an online cleaning three times this year compared to two times last year. Please note that in Year 2001 we only cleaned it ONE time. Does any body has/ had experience such a problem...

Is possible to calculate Kerosene Freeze point? vs analyzer prediction.ý

Hello All, What do you expect the pressure drop across the tower reading if you have damage Trays (sieve/valve trays) ? HIGH OR LOW ? Crude tower was opened for inspection and we found more than 10 valve trays are damaged !!!! we haven't seen any big changed on produtc quality (HGO).

Dear Friends, In our refinery we do have three big Amine Absorbers. Two of them have the ability to bypass them and do an online hot water wash and chemical wash, this is incase if we notice any increase in DP across the Absorber and or Amine carry over to K.O. drum. The other one has NO...

What is the most effective way to improve fractionation in Distillation tower (Crude tower), is to increase the PA return temperature or / and to drop the PA flow rate in order to lifting of material below the PA section to improve Freeze as an example?

Hello, I would like to have some sorts of correlation to calculate the Viscosity at different Temperature, since we measure our Viscosity for Heavy Fuel Oil @ 50 °C. I would like to know the expected viscosity at 100 °C. Thank you.

Hello there, What is the effect of having Positive Draft in the convection section?

What is the minimum velocity across the heat exchangers? We are planning to utilize one our heat exchangers (mainly out of service) to cool MHFO (Marine Heavy Fuel Oil) products since the current MHFO coolers is under size due to increase in unit throughput. So to maximize cooling we are...

Gentlemen, We have noticed in our refinery that the Steam driven pumps (pare pumps) are not reliable as the motor driven pumps. In other word, the turbine driven pumps are not delivering the required capacity. If you speaking of hp it should be equal. We are planning to spend a lot of money...

Currently we are running at higher Crude throughput and I have seen the following symptom in our Crude Tower: Whenever the tray 32 vapor temperature above the Kero draw drop below 230 °C i.e. 225 °C, the top temperature would increase by 5 °C which will effect the Naphtha 90% cut. When we...

Hello, Does anyone have such experience with the viscosity limit in the FCC Main Column Bottom (MCB)? What is the recommended maximum viscosity of MCB (in cst @ 100 °C) in order to avoid fouling the bottom MCB exchangers? The reason is we would like to maximize distillate makes by minimizing...

Hello, Can some one help me, I would like to have some sort of correlation to convert the heavy petroleum cuts (such as Vacuum bottom) Viscosity @ 100 °C to 50 °C. Any reference that I can refer to? Thank you.

Hello, Does anyone have an experience with Fuel gas purge in instrument transmitters (pressure, level indication, etc.)? If so what are the advantages and disadvantages? Thank you for your help.

Hello, Our Crude stream (main charge) will split into two parallel streams A & B. Each stream has it own preheat and desalter system. Each Desalter has a PSV which will be discharged to the Crude tower. The PSV setting pressure is 13.45 BarG. Since we are running at higher Crude throughout...