The Eco-Purge solves what has become a significant cost impact to companies installing high purity electropolished and/or general purity large diameter tube/pipe. High usage of purified Argon gas for purging and wait times for Oxygen evacuation of tube I.D. consumes large amounts of gas. The Eco-Purge reduces > 90% in purge gas consumption, > 65% reduction in time for purging/welding, in-situ oxygen and I.D. pressure monitoring ensure consistent high quality color free welds.