V/Na corrosion on ss 321 tubes

[Nagara]

Hello...I have a furnace that heats a stream of hydrogen, h2s,and heavy naphta from 320 to 380 °C. The tubes are made of 321 SS. The furnace is prepared to burn fuel oil. However our fuel oil contains now 200 ppm of V and 90 ppm of Na (originally, when the furnace was designed didnt contain V or Na). The question is if vanadium/Na will corrode the ss of the tubes, or if it will affect the expected tube life.

 

[metengr]

From past expierence with burning #6 crude in our B&W, wall- fired radiant reheat boiler, we had no external corrosion problems with any of the austenitic stainless steel superheater tube assemblies.