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Subject: Re: Naphtenic acid corrosion

Date: 04/20/01 at 8:22 AM
Posted by: Jorge L. Hau
E-mail: hauj@pdvsa.com
Message Posted:

In Reply to: Naphtenic acid corrosion posted by Pepe Gonzalez on 08/18/00 at 5:55 PM:

Most of the time blending to reduce TAN will work.
Since you intent to blend it up to 20%, final TAN
of crude slate will be less than 2.7 you mentioned.
Although we have not run Kuito crude, many refineries
are processing naphthenic crudes nowadays. Most
corrosive ones may be those having low sulfur. Some
crudes high in TAN and S are not as corrosive as
suggested just by TAN. Our experiences say that
vacuum transfer line, vacuum tower internal (flash
zone and HVGO section) are critical. What
you have in vacuum heater tubes? return bends
could be a problem. If it very corrosive, HVGO
circuit could be a problem.

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