heptane and 3003h14 aluminum condenser 2

[elloyd]

My company manufactures solvent recycling machines and we have encountered a problem with our aluminum condensers. A customers is trying to recycle heptane using our recyler. The heptane is heated to 80-95C. When the vapors reach the condenser, it attacks the weld. Is the heptane creating excessive heat which is breaking down the welds or is heptane eating away at the welds? The aluminum casing of the condenser is not affected only the welds are affected. I am not sure what our vendor uses for welding the condenser but I was told the welding procedure is correct for 3003h14. What is a safe temperature range for 3003h14? Does anyone have a suggestion?

 

[PaoloPemi]

you should verify which welding material has been adopted and contact the supplier, if it's Ok it may be some fluid mixed with heptane which attacks the material, you may require a analysis and verify compatibility.

 

[btrueblood]

Not many fluids attack 3003 aluminum. Sulfuric acid maybe? Are you sure there is chemical attack, and not just erosion due to droplet impingement? Any idea what the flow velocity is? Is it possible that the welds are just seeing high thermal cycles and cracking due to fatigue?

 

[elloyd]

Our customer is sending the condenser out for evaluation of the welds. When I get the report I will post the results. thanks for your reply.