thread124-95533
I found this thread from a while back. Sshep had mentioned that the ideal mixed-mean velocity for vertical runs of pipe is 15 ft/sec or higher to avoid slugging. In one particular thermosyphon reboiler circuit I am evaluating, the velocities would be about 5 to 10 ft/sec...
A hypothetical situation that I'm sure happens all the time:
You have an 50/50 mixture of MDEA/Water solvent adsorbing CO2 from natural gas at 1000 psig in an amine contactor. The amine contactor has two-pass valve trays with 3" weir heights.
You are operating normally but then suddenly lose...
Does anybody have any experience split fin or segmented fin air coolers? It's also called High Performance or Wheelfin depending on the manufacturer. Basically the fin is a regular L-tension wound aluminum fin with a notch cut on the outside edge to increase air turbulence and help heat...
Are there any API guidelines for the blow-down of pressure vessels to flare? Are there any guidelines for how quickly the blow-down should occur (such as, no greater than 20 psid/minute or 10%/minute)
I work for an engeneering and construction company that has recently refurbished and is currently restarting an old Sulfinol plant. The plant was originally designed for processing 6 MMSCFD of high H2S gas with a 28 tray, 42" ID Contactor at 200 psig. Upon restarting it, we anticipate 2 MMSCFD...
We are looking into producing isoprene from isopentane separated from a natural gas stream. Does anybody know of any processes that are publicly available for this?
I am currently looking at modifying a plant to process a higher concentration of CO2 (2.5-> 3.6 mol%) and treat to less than 2%. Due to limitations on the still, I have started looking into a two stage treating process.
This involves splitting the rich amine between the original still and a...
I appologize for the repost. I have recieved some good input for this thread in the Chemical Plant forum, but I think that this is propably a more appropriate forum for this subject.
I have a mixture of acid gas that is (by mass) 73% CO2, 26% H2S, and about 0.2% H2O with trace hydrocarbons...
I have a mixture of acid gas that is (by mass) 73% CO2, 26% H2S, and about 0.2% H2O with trace hydrocarbons. The acid gas is compressed to 1100 psig and then flows to the injection well through a buried carbon steel pipeline.
My concern is that of an aqueous phase may condense one the gas...
I am currently designing a demethanizer for a cryogenic natural gas plant, and one of the most common problems I run into is CO2 freeze-out. One of the more interesting things I've noticed about HYSYS's CO2 freeze-out utility is that the predicted CO2 freeze-out temperature for liquid...
I have recently been having issues with the CO2 freeze utility in HYSYS. One of the more interesting things I've noticed is that the predicted CO2 freeze-out temperature for liquid hydrocarbons is extremely pressure dependent. For example:
For a liquid with the following composition.
CO2: 4.1%...
I'm currently designing a flashtank that is supposed to handle condensate from the inlet gas and periodic slugs. I am limited on the amount of outlet gas that can come from the flashtank (which will increase significantly as the slug hits). As a result there is a sharp pressure spike in the...
I recently got a job at a small company in Texas that designs natural gas processing plants. I'm basically a process engineer, but I can't be called an "engineer" because I'm not a PE yet. My official title is "process associate," but I don't particularly care to use that.
What are some...
