9 replies to this topic

[Dandy Komboris]

Dear Fellow Engineer

 

My Dehydration Unit Color has turned to brown

I attach the photo so All of you can see it

I assume this color because of the TEG Droplet coming out of the system through the Venting Line.

Have all of you ever Find This Problems in Your Field ??

Should i give some detail information for you guys to analyze the process ?

 

Please help me guys

 

Warm

 

Regards

 

 

 

Attached Files

•  2013-11-25 14.39.22.jpg   159.8KB   6 downloads

[maqqadri]

Replace your cartridge and carbon filter media
timely & ponder on re sizing them. Check activated carbon shelf life

[cnu879]

Dear Dandy,

 

Please refer the following, hopefully you will get the solution. Mr.Art gave his views on Yellow/Brown color change of TEG unit based on his experience.

 

Please refer Post Number of 22 & 28.

 

http://www.cheresour...as-dehydration/

   

Thanks.

Regards.

Srinii

[RockDock]

There may be multiple reasons for this. I would first suspect that you have a compound problem. First, you are carrying over amine to your TEG unit. Second, you have a leak (or multiple leaks).

[Dandy Komboris]

Dear RockDock

 

Yes there are leakeages in my Dehydration Unit, but still these leaks are not in top section of the Regeneratin Skid. I attached the P&ID of my Dehydration Unit. When I Operate the DHU the water droplet is coming out through the vent stack. I suspect the water droplet contains Some GLycol Droplet. These glycol droplets then spread out all over the Equipment Surface in Regenerating Section.

I believe the glycol is oxidized by the air that turn the color of the equipment surface to yellow color.

Has any one ever experienced this kind of problem ??

Please see the P&ID

 

I would appreciate any information from anyone of you

 

Warm Regards

 

 

Dandy

Attached Files

•  J11008-PR5-012_6 OK.pdf   731.29KB   48 downloads

[Art Montemayor]

 

Maqqadri, Cnu879, Rockdock, and I both have initially interpreted your writing as stating that your TEG fluid is brown in color.  While that may be the case, what you are now describing is an external, brown coating that has tainted your equipment externally.

 

What you may be seeing is the result of the fog/mist that is vented out of your rich TEG flash drum – especially if you are running your absorber rather “warm” (100+ ^oF) and your unit is located in a humid site (like Indonesia).  You didn’t supply the rest of the P&ID, so I have to assume you are venting the flash gas and not flaring it or burning it in your reboiler.  If that is not the case, then you may have other venting taking place near by.  Your photo is an excellent illustration of what is happening and I can detect what appears to be a foggy vent about half-way up the TEG Still tower.

 

I share your concern for the problem.  It isn’t only aesthetics; if your unit looks dirty and bad, it is an indication that the maintenance may also be bad – and that isn’t good.  All TEG units should reflect good, clean operation.

[zaheer87]

it may be due to the teg carry over along with the water vapor through the still column. . . .when we use a larger amount of sparging gas teg mist came through the still column and fall on the unit. . . .so reduce the TEG carry over through the still column.

[Dandy Komboris]

Thanks For All Your Input

 

Our Team has decided that we are going to Install Vent  Head in the Venting line, hopefully it will minimize glycol Carryover.

DOes Aneone has ane reference how to design Vent Head ??

I beg for your help. I've been searching in the internet or any literature that i have. There are no spesific design calculation for vent head design.

If somebody has the reference to design vent head it wouldbe a great help for me.

 

Warm Regrads

 

 

Dandy

[ankur2061]

Dandy,

 

The term "vent head" sounds unfamiliar (at least to me). Can you tell what will be the function of this item in some more detail?

 

Normally installing a mist eliminator mesh or a deflector plate at the gas outlet nozzle will prevent or minimize fine droplet carryover.

 

Regards,

Ankur. 

[RoyenG]

Hi,

 

and also not forget that ambient temperature in the area (Cilamaya) is quite low that can condense your "sour" gas if the plant don't have adequate vent system.

 

There are some tools like PHAST or build a calculation/spreadsheet for dispersion using API RP 521.

 

Regards,

Royen