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...
Thank you all for your feed back,
Ok let me give you some history, sorry if I wasn't so clear well.
As I mentioned above that three years ago the Turbine post pressure (presure indication located on the third turbine stage) start increasing gradually which means that there is some deposit is...
Td2k,
Based on the nalysis we have it seems to me it is related to steam quality !!!
We have consulted Nalco to do steam quality study and try to foucus in the WGCT.
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...
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...
Hello,
The main reason for my question is, in our visbreaker heater the screen (FOX1A) shows that we have a good draft but when I checked the convection section on the heater side I noticed that we do have a positive draft (hot gas coming out ).
We realized that we do have a damper problem and...
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.
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...
