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• Reduce the volume close to the weld requiring purging
• Shield the weld root and eliminate oxidation
• Allow the welder to adjust the purge gas pressure against the weld root to achieve the desired weld profile on the internal bore
• Cut down on inert shielding gas required
• Help to reduce customers’ carbon foot print
• Allow customers to increase weld production rates
• Eliminate weld defects associated with purging
• Available for 8" to 80" pipes

Weldwide Solutions Limited recommends the use of inflatable Ring Purge dams when customers are welding schedule pipework and all other kinds of cylindrical vessels. Ring Purge systems repeatedly demonstrate fast pay back to customers, through gas savings and increased production rates with no weld failures attributed to gas shielding of the weld root.

Ring Purge dams can be pushed and pulled through pipe lengths without friction or resistance. Once positioned, the product is inflated with inert shielding gas to seal the dam ends and will then automatically release any excess gas to purge the inside of the pipe between the purge dams. The inflatable Ring Purge dam ends require a minimum amount of gas to seal inside the pipe and since the dams isolate a small volume inside the pipe, fabricators immediately begin to use less gas before it is safe to start welding and can demonstrate that they are achieving a lower carbon footprint.

Ring Purge systems are suitable for purging autogenous weld fit ups as well as scheduled pipework that requires a gap between two bevelled pipe ends.

Inflatable Ring Purge systems allow the fabricator to introduce a higher gas flow rate, if they have a wide gap between the pipes for the root pass, thus preventing the likelihood of oxygen and other atmospheric gases entering the purge environment before the root pass is completed. Gas filled Ring Purge dams ensure an air tight seal inside the tubular system so no contamination can occur to the weld during the hot pass and subsequent weld passes.

Ring Purge systems can be set up for X-ray inspection procedures, so the dams remain inflated once the root has been welded and while it is inspected for any inclusion, contamination or weld porosity.

Ring Purge dam ends are connected with a hollow sleeve. In case of wind gusts blowing through the pipe, the air will pass through the sleeve without disturbing the weld purge and without changing the position of the dams. Inspection cameras can be moved through the Ring Purge sleeve to inspect earlier welded joints, for example, whilst subsequent welding takes place.