The bottoms stream from a hydrocarbon solvent distillation columns contains 5% water and dissolved ammonium sulfate salts. We are experiencing corrosion of our carbon steel piping near the column where the stream is hot (230 oF), but the piping in the tank farm where the stream has cooled off...
I'd look at how much the flow in each return leg changes versus differences in length, elbows, etc. If it is relatively small, then the "symetric pipes" have plenty of capacity to handle process and design variations.
Is the thermosyphon reboiler being considered a stage for mass transfer? If...
If the meters are accurate, then the allocation of steam to user C by difference will be accurate. All users are paying for heat used through steam metering.
I see the issue as who pays for the reduced boiler efficiency to produce high pressure steam when for one user (A), when other users (B...
I remember hydrazine hydrate vendor literature lists 304L and 316L stainless steels as recommended materials of contruction. This recommendation for may be for ambient and not cover the high temperatures of your process.
The top cautions for using hydrazine hydrate were using proper materials of construction and good industrial hygiene.
The suppliers recommend using stainless steel since the hydrazine removes the carbon steel oxide coating by reducing it to iron. This reaction releases heat and can cause a...
I recommend getting the 6s training. It is being used as an applicant screening tool and has nothing to do with hiring a good, capable engineer. Get it so your resume will make it to the next review level.
6s is a useful tool, but management abuses it thinking it is a cure all that gets more...
Once the condenser if drained, it won't matter what happens in the accumulator. Draining the accumulator increases deadband and slows response if the tower pressure drops.
Draining the drum can be used to drop pressure by venting vapor and non-condensables to a fuel gas / vent system.
Barry is correct about the differences in refrigerated and dessicant air dryers. Another is the dew point of the air. I don't know if there is a cost in operation since the refrigeration system uses a compressor.
A refrigerated dryer is limited to a dew point above 32 oF because it will stop...
I recommend paying a little more for a heated air dryer to get much higher process reliablity versus the heatless air dryer. The dryer regeneration process is direct since water desorption is forced due to the heat input. Because of this, proper regeneration is easily checked and restored...
Using diesel as the eductor motive fluid was probably done for environmental purposes instead of performance, though there may also be a performance improvement.
Previously steam was used for the eductors and was condensed with direct water contact to produce the tower vacuum. Unfortunately...
The purpose of nitrogen dilution in your case is to bring the H2 conc. below the LEL. You would be going from 100% H2 to say 5% (I didn't look it up, but it is low). That means you will need 19 volumes of nitrogen for every volume of hydrogen, which works out to a ridculously high flow of...
Does this project have an attractive payout? This needs to be checked before any engineering resources are applied.
Management comes up with all kind of ideas which then becomes your job to challenge and justify. Don't assume they know what they are doing. Because they have few cost control...
mechtimeng,
Is the open & line flowing or blocked in? I'm guessing you calculated the time to completely freeze a blocked in line.
It make take 17 hours to freeze a line, but this is different than the pressure profile. The formation of a small amount of ice in a blocked, liquid full line...
Gorkus,
Please work with a local chemical or pump engineer to calculate what you need. You seem confused on the concepts of enthalpy, NPSH, and composition. At this rate I'm worried you will improperly apply these formulas and unknowingly proceed with the wrong value in purchasing equipment...
