To assure that all ambient air has been removed from the pipeline prior to brazing, what shall be used to verify the effectiveness of the purge?

To assure that all ambient air has been removed from the pipeline prior to brazing, the use of an oxygen analyzer is crucial. This device measures the concentration of oxygen in the purged environment. Since oxygen is a key component of ambient air, having a method to detect its presence allows the installer to confirm that sufficient purging has taken place to avoid oxidation during the brazing process.

When brazing, any residual oxygen can lead to the formation of oxides, which can affect the quality of the joint and potentially lead to failure. By monitoring the levels of oxygen with the analyzer, installers can ensure that the atmosphere inside the pipeline is predominantly inert, typically achieved using an inert gas like nitrogen.

Other choices do not provide the necessary information to confirm the effectiveness of the purge concerning the oxidation risk. For example, an air analyzer might assess overall air quality but does not target the specific concern of oxygen content as it relates to brazing. Nitrogen analyzers focus on measuring nitrogen levels, which, while important for the process, do not directly assess oxygen levels. A breathalyzer, on the other hand, is unrelated to the industrial process and serves a completely different purpose.