CARBON STEEL CORROSION - BYPASS TOWER
CARBON STEEL CORROSION - BYPASS TOWER
(OP)
Hello !
Current Material - A 36 or A 515.
Environment - chlorides (~1.5%); SO2 ( ~ 0.13%) and coal (~ 1% S).
Mechanism : The gas entering the system will be around 1100 C, and will be quenched by fresh air down to about 350 C. Most of the chlorides and alkalis should condense on the dust. The gas / dust stream then will pass to the conditioning tower (bypass). NOTE: Basically, one of the the fuels the plant will use is a liquid waste from the manufacture of industrial chemicals, which leads to the high amount of chloride present in the fuel. The chloride will be in liquid phase from the storage tanks up to the burner pipe , after which point it will be a vapor. The vapor will condense to a solid coating in the cooler portions of the tower.
QUESTIONS :
1. Would a 50 % / 50 % Cr - Ni alloy be an overkill to avoid both pitting and general corrosion , as well as sulfidation ? Any alloy suggestions ? The current carbon steels in use are not lasting too long.
2. Regardless the alloy selected , would carbon steel thermal sprayed with the new selected alloy be an option ?
3. Have you ever heard about "FLUEGARD-425" as a coating option for gas conditioning towers ?
Any suggestions for the above questions would be greatly appreciated.
Current Material - A 36 or A 515.
Environment - chlorides (~1.5%); SO2 ( ~ 0.13%) and coal (~ 1% S).
Mechanism : The gas entering the system will be around 1100 C, and will be quenched by fresh air down to about 350 C. Most of the chlorides and alkalis should condense on the dust. The gas / dust stream then will pass to the conditioning tower (bypass). NOTE: Basically, one of the the fuels the plant will use is a liquid waste from the manufacture of industrial chemicals, which leads to the high amount of chloride present in the fuel. The chloride will be in liquid phase from the storage tanks up to the burner pipe , after which point it will be a vapor. The vapor will condense to a solid coating in the cooler portions of the tower.
QUESTIONS :
1. Would a 50 % / 50 % Cr - Ni alloy be an overkill to avoid both pitting and general corrosion , as well as sulfidation ? Any alloy suggestions ? The current carbon steels in use are not lasting too long.
2. Regardless the alloy selected , would carbon steel thermal sprayed with the new selected alloy be an option ?
3. Have you ever heard about "FLUEGARD-425" as a coating option for gas conditioning towers ?
Any suggestions for the above questions would be greatly appreciated.





RE: CARBON STEEL CORROSION - BYPASS TOWER
Besides the coating options you quoted, you might test also SermeTel W from www.sermatech.com
and thermal sprayed panels coated with aluminum or Ni-Cr alloys like Metco 43C-NS from
http://www.sulzermetco.com
Coating manufacturers could be contacted for getting their recommendations.
Regards,
http://www.welding-advisers.com/
RE: CARBON STEEL CORROSION - BYPASS TOWER
You need to look at your system and divide inot areas based on severity of corrosion. In less severe sections a coating is a good option.
= = = = = = = = = = = = = = = = = = = =
Corrosion, every where, all the time.
Manage it or it will manage you.
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: CARBON STEEL CORROSION - BYPASS TOWER
EdStainless: Any alloy suugestions for the condensation zone saturated in Cl ?
RE: CARBON STEEL CORROSION - BYPASS TOWER
In power plants carbon steel ducts have been lined with alloy sheets (wallpapered) as a means to retrofit the existing duct rather than completely replacing it. 16ga or 14ga sheet is typically used.
RE: CARBON STEEL CORROSION - BYPASS TOWER
Would you please indicate who supplies "wallpaper" ?
RE: CARBON STEEL CORROSION - BYPASS TOWER
Review the Penta Industrial Website at www.pentaindustrial.com.