Within few months of Commissioning, Lean TEG color turned into yellow.
1.) Checked for Iron counts and found normal.
2.) Initially suspected for hydrocarbon contamination and replaced Carbon filter and reduced pressure in Flash Drum to induce more flashing.
3.) We could not meet the delta T of 5-7 C in Contactor between the Glycol and Wet Gas due to design constraints.
4.) We are maintaining still column temperature around 120 - 130 C and Reboiler temperature maintaining at 195 C.
5.) Reboiler performance seems to be good as concentration is always above 99%.
6.) Lean TEG pH is maintaining around 7.5 to 7.8
What could be the reason for this color change ?
Also I would like to know about consequences which could arise for not maintaining delta T of 5-7 C between Glycol and Wet Gas in Contactor.