These systems will typically purge 36” pipe diameters to below 0.1% oxygen in less than 10 minutes and all smaller pipes,
Each Quick Purge system is covered with heat protective material on the inside, so that the high temperatures at close
proximity to the weld do not damage the devices. Three hoses are available, one for argon inflation and purge,
the second for auxilliary purge and the third for gas exhaust via a purge monitor.
The system is connected to an argon hose and inserted into the pipe to be welded.
Argweld® quick purge – pipe Purging Systems The spinal connection hose is shorter than with other devices, to keep the purged volume to a minimum. The majority of the volume between the two dams, is filled with a special heat resisting collar, to keep the purge time low. After positioning the system the argon source is opened, the dams inflated to size and the interspace purged. After a few seconds, the auxilliary purge line can be opened to ensure the fastest possible purge time. In trials these devices have performed many high speed welds under these conditions.
Typical installation of a standard inflatable purge system.
1 – The Argweld® Quick Purge Purging System is positioned using the pull tags.
3 – Once the Purging System is inflated and seals in the pipe, the pressure opens the purge valve (c), the air space is purged by the inert gas, displacing the air between the dams to the outside (d) via the exhausts. Until the oxygen level is low enough to begin welding.
4 – During welding the flow rate of inert gas should be maintained to purge any oxygen released by the increasing temperature.
5 – When the weld is completed and allowed to cool below oxidation temperature, the purge gas can be shut off, the system will deflate and then can be removed.
Another perfect pipe weld!