Wednesday, 28 May 2014 00:44

World's Largest Inflatable Pipe Weld Purging System

Weld Butts in Pipe Diameters up to 80” diameter can now be purged using the Argweld® QuickPurge®II Inflatable Pipe and Pipeline Weld Purging Systems.

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QuickPurge®II Pipe Weld Purging Systems have been designed to dramatically reduce weld purging times and deliver bright shiny oxide free welds irrespective of the size and the volume of the pipe.

A central  collar between the two inflatable dams reduces the volume  to be purged to a small annulus.

Around the centre of the collar is a piece  of ‘RootGlo®’ illuminating strip that  allows operators to see the centre of the purging system. RootGlo®  holds its illuminating charge for 24 hours after which it can be recharged simply by exposing it to daylight for ten minutes.

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The PurgeGate®  accessory is fitted to all QuickPurge®II Systems. PurgeGate®  is a special device  that prevents the purge gas  input pressure to the Inflatable Pipe Weld Purging System from rising above 7.5 psi.

Even in the event that the gas pressure rises suddenly to 50 psi by error, only 7.5 psi can be allowed through  to the inflatable dams so they are unlikely to burst due to over inflation.

Another new development from the HFT development team is the IntaCal®specially developed purge  valve  that does not need setting like previous systems.

So inert gas is fed into the PurgeGate® system which then passes through at 7.5 psi or less to the IntaCal® valve which allows inflation of the first dam, after which inflation of the second dam takes place before surplus purge gas is passed into the purge void to eliminate air from the trapped cavity.

Using a Weld Purge  Monitor®, engineers can ascertain exactly when the amount of oxygen has been reduced to an adequate level for their applications.

Because of the low vapour pressure materials that have been selected for QuickPurge®II, it is possible with these System to reach an oxygen level of better than 10 ppm to ensure that bright shiny welds are created.

Even  with this significantly  reduced annulus having  been designed, QuickPurge®II Systems are manufactured in sizes of 6” (150 mm) diameter and upwards to 96” (2440 mm).

Additional Info

Further information can be obtained from HFT®at www

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