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Material selection in DBNPA service environment

Material selection in DBNPA service environment

Material selection in DBNPA service environment

(OP)
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]

RE: Material selection in DBNPA service environment

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

RE: Material selection in DBNPA service environment

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

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