5 replies to this topic

[engg]

I wanted to dry a pipeline using MEG. I am not able to find water affinity of MEG ie how much MEG is needed to absorb lets say a 1000kg of water? will appreciate your help.

 

Which of the Glycol has higher loading of water. is it MEG or TEG?

[shan]

Glycol is used to absorb water from gas phase.  It will mix with any amount of liquid water to form any concentration solutions.  1000 kg of water + 1000 kg of MEG will be 50% wt MEG solution.

[Erwin APRIANDI]

Hi engg,

 

What do you mean by drying a pipeline?  Glycol is in a liquid form and if your intention is to dry completely the pipeline using a glycol, I do not think you will be able to do that.  As Shan has mentioned, glycol will mix with water to for a concentration solution. It is not acting as an adsorbant such as desicant gel.

 

I believe, for pipeline drying there are such procedures called air and nitrogen purging.  This is what is usually used during the pre-comissioning of a plant for piping and equipment to dry and to ensure no liquid is left in the piping system.

 

Please elaborate further, what is the intention?

[engg]

Erwin:

 

hi

 

thanks,

 

glycol is hygroscopic, i intend to make use of its hygroscopic character....got it?

[Lai.CY]

Hello Engg,

 

As far as I know, different ethylene glycols have the same absorpability. Regardless it's MEG or TEG, the diols are still two, and it

is the diols that absorbs water.

[thorium90]

I believe what erwin is trying to say is that if the purpose is to remove moisture in the pipeline, it would be alot easier (and cheaper) to use dry air or nitrogen to purge it rather than to pump a presumably large quantity MEG along with the use of associated equipment through a presumably long length of pipeline. And there is also the need to clear out all the MEG after it is done as the entire stretch of pipeline will presumably be used to transport something else after that...