Can anhydrous ammonia cause erosion for piping? 1

[etsen]

Can anhydrous ammonia ?vapor or liquid?cause erosion or corrosion for piping elbow and tee made of carbon steel or low alloy steel in refrigeration system?

 

[EdStainless]

sounds like contamination in the system.
Is there much water? Check the pH?

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Plymouth Tube

 

[strider6]

it can cause erosion if the fluid velocity is high, you should look at API 14E and use the formula to calculate the max velocity to avoid erosion..

S

Corrosion Prevention & Corrosion Control

 

[TomEun]

In high velocity flow pattern (<erosion velocity), the anhydrous ammonia may not have a specific synergetic effect to accelerate the corrosion while amine or ammonium bisulfide has an accelerative effect of corrosion.

The most critical issue will be Stress Corrosion Cracking, not a severe metal loss if the design is under the general erosion velocity limitation.

References
- NACE Publication 24061
- MTI MS-6