Material selection in DBNPA service environment

[tdhaberk]

We have some 316 check valves in DBNPA service that are getting eaten up. I don't know concentration. All I know is that it is running at ambient at a pressure of 100 psi. The customer is a chemical treating company. Here is a short snippet on DBNPA. Any thoughts would be much appreciated. Thanks in advance.

DBNPA or 2,2-dibromo-3-nitrilopropionamide is a quick-kill biocide that easily hydrolyzes under both acidic and alkaline conditions. It is preferred for its instability in water as it quickly kills and then quickly degrades to form a number of products, depending on the conditions, including ammonia, bromine ions, dibromoacetonitrile, and dibromoacetic acid.[2] DBNPA acts similar to the typical halogen biocides.
DBNPA is used in a wide variety of applications. Some examples are in papermaking as a preservative in paper coating and slurries. It is also used as slime control on papermachines, and as a biocide in hydraulic fracturing wells and in cooling water.[2]

 

[metengr]

Corroded or eroded or cavitation damage in the valve body??

 

[EdStainless]

Br will eat the heck out of 316.
I would replace them with "C" alloy checks (C276 or C22).
The combination of halides and high velocities will make this difficult.

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P.E. Metallurgy, Plymouth Tube