4 replies to this topic

[prince1pahariaa]

I was going through TEMA recommendation for rho-v2 provided at  "RCB-4.6 IMPINGEMENT BAFFLES AND EROSION PROTECTION". I noticed there is no consideration of material in the guide line. For example, if shell side fluid (Water) enters and impinge tube bundle with rho-v2 >5953, it will violate the guideline and erosion of tube are likely. But in this there is no guideline for tube material. In my system tube could be of Copper, SS or Cu-Ni or any alloy. I think limit for SS tube should be more than copper tube. Can anyone help me understand what i am missing.

[Pilesar]

You may be correct - I had not noticed as I mostly work with steel tubes. I try to configure my exchanger designs so that impingement is not an issue. I don't know what abuse the exchanger will undergo in the field and I don't want to have to make excuse later 'but TEMA said it would be okay.' If you find a reference comparing impingement erosion as a function of tube material, please share it.

[prince1pahariaa]

Thanks Pilesar for the response.

Surely i will post any solution or literature which addresses the topic. I am also asking around to see if anyone have any idea.

I have not gone through other standard like API 660 which also deals with heat exchanger. Other code might have some information about the topic.

Please let me know if you or anyone one know other sources.

 

Thanks

[Pilesar]

I find this information from a world wide web inquiry so it may be correct or not:

 

Common Tube Materials and Their Erosion Resistance

1. Copper (Cu)

   • Properties: Soft and ductile, excellent thermal conductivity.
   • Erosion Resistance: Low resistance to erosion due to its softness.
   • Typical ρ⋅v² Limit: Generally recommended to keep ρ⋅v² below 5,000 kg/(m·s²) to minimize erosion.

2. Stainless Steel (SS) (e.g., SS 304, SS 316)

   • Properties: Harder and more corrosion-resistant than copper, good mechanical strength.
   • Erosion Resistance: High resistance to erosion.
   • Typical ρ⋅v² Limit: Can typically tolerate ρ⋅v²  values up to 10,000 kg/(m·s²) or higher.

3. Copper-Nickel (Cu-Ni) Alloys (e.g., 70-30 Cu-Ni, 90-10 Cu-Ni)

   • Properties: Good corrosion resistance, especially in seawater; harder than pure copper.
   • Erosion Resistance: Moderate resistance to erosion.
   • Typical ρ⋅v² Limit: Often recommended to keep ρ⋅v² below 7,500 kg/(m·s²).

4. Titanium (Ti)

   • Properties: Excellent corrosion resistance, high strength-to-weight ratio.
   • Erosion Resistance: Very high resistance to erosion and corrosion.
   • Typical ρ⋅v²  Limit: Can typically handle ρ⋅v²  values above 15,000 kg/(m·s²).

5. Nickel Alloys (e.g., Inconel, Monel)

   • Properties: Exceptional corrosion and high-temperature resistance.
   • Erosion Resistance: Very high resistance to erosion.
   • Typical ρ⋅v² Limit: Can often withstand ρ⋅v² values exceeding 20,000 kg/(m·s²).

Edited by Pilesar, 22 May 2024 - 07:13 AM.

[prince1pahariaa]

Thanks for the effort.

 

It did help. I will cross verify.