Steam NH3 threshold for Brass SCC?

[some1else]

I understand that it primarily occurs at pH>8.5, but is there a general ammonia content threshold below which season cracking is unlikely to occur in steam service? Thanks in advance.

 

[metengr]

I would be more concerned with ammonia grooving than SCC in steam service. Example - brass condenser tubes which are exposed to wet steam conditions on the OD and cooling water on the ID surface.

 

[blacksmith37]

I think it is usually a dangerous game to rely on temperature, pH, concentrations, etc, to prevent SCC; there is always an upset. That being said our refineries would use Admiralty in streams with H2S, it was some protection.