BS EN 12735-1:2020 pdf free.Copper and copper alloys一Seamless, round tubes for air conditioning and refrigeration.Tubes for piping systems. BS EN 12735-1 This document specifies the requirements, sampling, test methods and conditions of delivery for seamless round copper and copper alloy tubes used for refrigeration and air-conditioning piping systems (i.e. piping, connections and repairs).It is applicable to tubes with an outside...