Argweld® Single Ended Inflatable Purging Dams

Weld Purge Dams are single ended purge systems for closure welds, T piece joints, dome end connections, where a conventional Tandem Purge System cannot be used.



Single Ended Purge Dams are a low-cost alternative to plastic foam or cardboard dams. These isolating Inflatable Dams are manufactured from advanced low out-gassing rate materials. The single dams are ideal for applications of closing welds where retrieval is possible and other joints where a Tandem Pipe Purging System is not required. These simple to use, easy to insert Argweld® Inflatable Single Ended Weld Purge Dams c can be used in connection with other styles or sizes of dams elsewhere within the piping system.  

Single ended Purge dams are ideal for tight bends, T piece joints, dome end connections and so on, where a Tandem Weld Purge Bladder Inflatable System cannot be used. These Inflatable Weld Purge Dams provide an excellent grip in the pipe with an effective all-round seal. Each Dam has a weld purge gas inflation hose and an exhaust port for exiting purge gas. An additional hose for extra gas input is also provided, which is useful for higher speed purging and for weld cooling to reach interpass temperature specifications. This ensures a zero colour (non oxidised) weld. There is also an additional hose for a weld Purge Monitor and Gas Detection and Analyzing Instrument to be attached.

Quick, fast, very simple to use use. Available in Sizes from 6″ to 96″.

Argweld® Inflatable Single Ended Purge Dams are a manufactured to prevent common weld problems :

• Prevents Weld coking

• Prevents Oxidation

• Prevents Weld root contamination

• Prevents Weld cut-outs

• Prevents Loss of corrosion resistance

• Prevents other issues that might occur as a result of using plastic foam or other unsuitable materials that can release massive amounts of air, oxygen, hydrogen, carbon, gases and water into the weld zone during the welding process. The Argweld® Inflatable Single Ended Purge Dams are used, when it is not possible to use Argweld® PurgElite® or Argweld® QuickPurge® Tandem Style Weld Purge Systems or the old fashioned Purge Bladder Systems.

Apart from the benefits of having a metallurgically sound weld, the difficulties of cleaning an oxidised weld are eliminated, saving vast amounts of money in labour and material costs as well as the disposal costs where acids are concerned.

Advise your technicians against spending time fabricating dams made of foam, cardboard, adhesive tape, wood and so on. Like paper, these materials contain a high percentage of water and water is very undesirable to have in the presence of a weld. As these poor materials are warmed by the welding operation, they start to out-gas their water vapour, which starts to circulate around the weld joint and combine with the weld pool to cause porosity and oxidation.

Now there is no more reason to put your welds at risk by using apparently cheaper materials, use Argweld® Inflatable Single Ended Weld Purge Dams can be purchased instead!

Size Range 6 to 96″ (150 to 2440 mm)

Manufactured for pipe diameters from 6 to 96 inches (150 up to 2440 mm), these lightweight systems are easy to inflate using the purge gas.

Leak tightness

Once the Dam is inflated and seals all around the internal circumference of the pipe, the excess inert purge gas spills out and purges the space around the weld joint, which then pushes the air out into the open atmosphere.

Proper Use

Each Dam is equipped with a purge/inflation hose (black), an extra purge gas hose (blue) as well as a hose for connecting a Weld Purge Monitor®  Gas Detection and Analysing Instrument (red).

The blue hose is suitable for passing extra gas into the weld zone at any time to cool welds and meet interpass temperature specifications, or to provide extra inert gas in the event of titanium, zirconium or special stainless applications needing a guaranteed zero colour weld.

By producing bright shiny welds, there will be no porosity and there will be no loss of corrosion resistance caused by oxidation.

Argweld Single Ended Purge dams.