High TAN Crudes 3

[pepegonza]

I would like to share experience in running high TAN crudes like Kuito (from Angola) and Marlim (from Brazil).

 

[masg]

We don't run those crudes. Our TAN limit is 0.5 on mixed crude charge. We're eyeing a metallurgical upgrade to 317L throughout our atmospheric and vacuum gas oil systems so we can increase the TAN and charge less expensive crude. We'd be replacing carbon steel, 5 and 9 chrome, and 410 SS clad systems. The post project mixed crude TAN limit would be about 0.7, low enough to keep non 317 alloy systems from exceeding 500 degF and 1.0 TAN.

Steve Grzywa
sgrzywa@citgo.com

 

[vikkyr]

Can you explain me, what is TAN?

vikas

 

[StressGuy]

The stress engineers and piping designers who do that job are going to have a good bit of work on their hands with that upgrade, especially going from chrome to stainless. I've been through a few of those and they make for some tough rework. Edward L. Klein
Pipe Stress Engineer
Houston, Texas

All opinions expressed here are my own and not my company's.

 

[TD2K]

TAN - total acid number.

try

http://www.google.com

and 'crude oil tan number' for more information.

 

[25362]

upgrading metallurgy is the long-term approcah. Some refiners think that injecting filming/neutralizing corrsion inhibitors are more cost effective.