Methanol and FBE Coating?

[Corroneer]

Hi Everyone,

Is anyone aware of any effect of methanol on the FBE coating of the pipings? What about other hydrate inhibitors (e.g. Mono Ethylene Glycol)?
Appreciate if you can cite some references.

Regards,
Corroneer

 

[Bibek29]

FBE coating is NOT 100% compatible for Methanol and Ethylene Glycol. Also, FBE coated piping for Methanol / Ethylene Glycol is generally NOT seen in industry. Usage of other piping materials for the pupose may be referred.
Regards,
Bibek.

 

[Corroneer]

Any references?

 

[SJones]

Is this for continuous injection, or start up/shutdown cases? The former would suggest inhibition as a corrosion control measure, the latter would suggest that internal FBE could get away with it, but the manufacturers would have to provide evidence. Aramco are likely to have the most experience, as probably the largest user of internal FBE, but nothing regarding adverse effects of methanol or glycol is noted in their coating standards of mid-2000s vintage.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[LittleInch]

Internal lining?

why are you internally lining a methanol pipe?

Or is this a flowing pipe with some methanol in it?

If you provide better info you'll get better answers.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[SJones]

@LI the clue is "hydrate inhibitors."

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[LittleInch]

Ok. Missed that.

Internal coatings for corrosion prevention are never a great plan. Too many failure locations.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[SJones]

Indeed. I was always mystified why Aramco pay for both internal FBE coating AND chemical treatment simultaneously. If it needs the support of chemical treatment, it ain't good enough.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[LittleInch]

I remember hearing a few years ago that they tried the internal coating only route using some mechanical connectors to preserve the internal lining, but they got fairly rapid failure, so with both then at least this way MOST of the pipe won't corrode....

I've looked at internal coating systems for corrosion purposes many times and remain unconvinced that you can test for and maintain enough of the coating 100% to avoid corrosion and leaks.

A line only needs to leak once and any savings from using carbon steel evaporate. Lining is different but also has issues, but then you already know that.

Low friction flow coating for sure works very well.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[SJones]

We started using Thru-Kote sleeves in Oman for internally FBE coated 6-inch flowlines in the early 90s. Apparently, the coating did create sufficient life extension over uncoated before leaking to be of positive cost benefit. I never saw any data to justify the belief and it fell out of favour anyway. For larger diameters, I remember very well the pain of watching the internal field joint coating robot fouling up joint after joint. Debacle. I was never a fan of internal coating for corrosion control, and that experience sealed my view for life.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[Corroneer]

Thanks for that gentlemen.