The pipelines at the top of the atmospheric pressure tower are severely corroded. Want to upgrade the material; seeking recommendations
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The elbow below the top overhead heat exchanger in the atmospheric pressure tower is severely corroded. The constant-pressure oil and gas flow through the heat exchanger tube side to exchange heat with the feed oil. The elbow below the tube box often suffers severe corrosion at the oil and gas outlet; upon inspection, it is found to be pitting corrosion. Pit after pit. The elbow is made of grade 20 steel. The material used for the tube side of the heat exchanger is S22053. The original thickness of the elbows was 11 mm; currently, the thinnest part is 4 mm. It is planned to upgrade the material during the next maintenance session. Are there any corrosion-resistant materials?
Special material equipment manufacturing, Yantai Yifang!
The thinning here is quite severe; don’t wait until the next cycle – address it ahead of time. The material selection can be adapted; the guidelines for choosing materials with high sulfur or high acid content should be upgraded.
If the biphasic steel used in the tube side of the heat exchanger is corrosion-resistant, it is recommended to use biphasic steel for the overhead pipeline and fittings as well.
I’m here to learn about the use of polyaniline for anti-corrosion purposes. What are the specific operating conditions? Could you please explain them?
316L should work; it’s mainly resistant to acidic corrosion, but the price will be several times higher
It is recommended to use H2S-resistant material or duplex steel
Yes. It is caused by the poor quality of crude oil.