CS welding (for H2SO4 piping)

[Adnan2222]

Any tips on 98% Sulfuric Acid 1" CS piping/fitting welding in order to minimize corrosion and acid spills? Site climate is dry with ambient temperature + 40 C.

 

[metengr]

I would use the GTAW process for the root and fill for the piping and fittings, and make sure the sulfuric acid remains concentrated - no moisture, and is under low flow conditions for service. Do not use carbon steel if injecting the sulfuric acid in a flow stream.

 

[MJCronin]

Two fundamental rules of 98% sulfuric acid piping:

- Use 304/316 stainless if you can...if not, go for heavy wall carbon steel...Schedule 80 or better.

- Keep the piping big and the velocity low....say 2-3 feet per minute.

Oh..... and don't expect the system to last forrever. If you get five years, you have gotten your monies worth

 

[Guest102023]

Various acid suppliers also issue guidelines for design and fabrication of vessels and piping. Google or contact them directly.

 

[emxhps06]

Carbon steel derives its resistance from the formation of a protective ferrous sulphate layer. Hence, the importance of controlling the velocity. Keep it low as mentioned