The tandem based Argweld® PurgExtra™ Inflatable Pipe Purging System has been designed specially for the welding of high specification stainless steel, titanium and other reactive alloys.
Each system has 2 protected inflatable dams connected by an armoured heatproof spinal tube. Once ready to start purging, the system is inserted into the bore with one dam on either side of the weld joint. When the gas connection is made and opened, the dams inflate to form a seal, after which the pressure in the system opens the purge IntaCal®. The inert gas is then fed into the space between the dams expelling the air through the integral exhaust tubes.
All systems include RootGlo®, a centering band which glows in the dark for up to 20 hours after 10 minutes exposure to light and IntaCal®, a unique purge gas release system.
Each system can be fitted with PurgeGate® as an accessory. PurgeGate® is a revoluntary control mechanism for pressure and flow. With the use of PurgeGate®, the systems are guaranteed not to burst due to over pressurization.Welding can then be carried out with the inert gas ensuring a clean even penetration bead.
Use of Argweld® PurgEye® 100 IP65 Weld Purge Monitor® is highly recommended as it will show when the required level of purge has been achieved.
After the welding is complete the dams are deflated simply by disconnecting the purge gas feed and the device can be easily removed. This uniquely designed system means that only one gas connection is required for both dam inflation and weld purging.
The PurgExtra™ contains quick fit couplings complete with “o” ring for gas tight sealing and stainless steel collet to hold the tube mechanically tight. Now fitted with “Anti-release” circlip to prevent parts accidentally separating inside the pipe.