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Mothballing of TEG dehydration unit

Mothballing of TEG dehydration unit

Mothballing of TEG dehydration unit

(OP)
In my project we will have to isolate and mothball two TEG dehydration units (contactor & regeneration) while the up- and downstream facilities are modified. Expected duration is 6 to 9 months.
As the units are from 1982 I fear that it will be impossible to bring the units back in service, if left cold and without circulation under N2 blanket.
Hence, I am considering to isolate the units from the hydrocarbon system, establish a nitrogen blanket, keep the temperature at 30-40 deg. C and to keep the glycol pumps running at reduced rates.
Do you have any experience to share on this topic?

RE: Mothballing of TEG dehydration unit

You are on the right track, a good reference is MTI publication 34, Guidelines for the  Mothballing of Process Plants

RE: Mothballing of TEG dehydration unit

I would continue to
 - check glycol pH,
 - and possibly get some diesel or inhibited condensate into the separator section of the contactor.
 - be prepared to do a fluid end pump service when you come back on line with operating pressure
 - do periodic glycol analyses every couple of months just to watch for trends.

 

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