Large diameter pipe purging

Care is necessary when welding large diameter pipework in stainless, duplex, chrome steels, nickel alloys and zirconium.
When welding such reactive materials, they need to be purged of oxygen before, during and after welding, which can cause a huge expense when they are of a large diameter.
Weld purging experts Huntingdon Fusion Techniques (HFT) innovative QuickPurge Systems, which are manufactured up to 88 inches (2,235mm), dramatically reduces the space that needs to be purged.
This reduces purging time dramatically, making huge savings in both time and gas costs.
Ron Sewell, chairman of HFT, said: “Using QuickPurge means there is no longer a need to fill complete pipes with an inert gas. The systems are so efficient they pay for themselves in the first couple of welds in gas savings alone, whatever the pipe size. QuickPurge is simply inserted into a tube or pipe, inflated within the pipe, restricting the area that is to be welded, reducing the oxygen level down to 100 parts per million (ppm) within minutes.”
QuickPurge has an additional gas input line, which means extra purge gas can be introduced for applications such as this, thereby achieving a much faster purge, down to the lowest oxygen levels, which is perfect for larger diameter pipes where quality welds are required.
The system is leading the way in the field of purging tube, pipe and pipeline joints over 6 inches diameter, where oxygen levels are required to be as low as 100 ppm or less.
Its design means that zero colour welds will be achieved and there will be no loss of corrosion resistance or loss of mechanical strength caused due to the presence of oxygen, nitrogen or hydrogen gas.
Using IntaCal combined with the integrated PurgeGate device makes it possible to safely inflate the dams with argon gas, for purging the space between the dams where the weld joint is located.
With PurgeGate, burst dams are prevented in the event of undue pressure increase or accidental flow increase of the purging gas.
design and manufactures the HotPurge® range for a higher and longer temperature exposure.

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