Copper Nickel Blind Flanges are a type of flange used to seal the end of a piping system or a pressure vessel, effectively closing it off. They are constructed from copper-nickel alloys, which typically consist of varying percentages of copper and nickel along with trace amounts of other elements like iron and manganese.

Blind flanges are solid plates with no bore or center hole. They are bolted to the end of a pipe or fitting to block off the flow of a fluid or to create a seal in the system. These flanges are often used when future expansion or maintenance might be necessary, as they provide a closure point that can be easily removed for access or modifications.