Material selection: condenser tubes for ammonia refrigeration For ammonia (NH3) refrigerating systems using shell-and-tube condensers, which tube material is appropriate considering compatibility and corrosion? Choose the correct material.

Concept/ApproachAnhydrous ammonia is incompatible with copper and copper alloys (e.g., brass), which can suffer corrosion/stress corrosion cracking in ammonia service.

ThereforeSteel tubes are used for condensers/evaporators in ammonia systems.