Restricting the volume when welding large stainless steel tube and pipes can save time and costs. Previously, welders have spent many hours waiting for oxygen levels to be low enough to start welding. Huntingdon Fusion Techniques HFT® have designed and developed QuickPurge® Systems to reduce the space that needs to be purged, for pipes up to 88 in. (2235 mm).
Ron Sewell, Chairman for HFT said: “The deflated QuickPurge System is placed inside the pipe and inflated. RootGlo® luminescent positioning strip illuminates the joint position ensuring that the System is positioned in the pipe correctly. The QuickPurge is then inflated and connected to a Weld Purge Monitor® to measure the exact oxygen level throughout the welding cycle.”
“A 1400 mm (55 in.) System can be purged down to 100 ppm ready for welding in just 55 min.”
QuickPurge has an additional gas input line, which means extra purge gas can be introduced for applications such as this, thereby achieving a faster purge, down to the lowest oxygen levels, which is suitable for larger diameter pipes where quality welds are required.
High speed pipe purging system QuickPurge is designed for the field of purging tube, pipe and pipeline joints over 150 mm (6 in.) diameter, where oxygen levels are required to be as low as 100 ppm or less.
Huntingdon Fusion Techniques, HFT’s design of the QuickPurge System means that zero colour welds can be achieved, with no loss of corrosion resistance caused by oxidation.
Using IntaCal® combined with the integrated PurgeGate® device makes it possible to safely inflate the dams with inert 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.
Materials used in the manufacture of QuickPurge are resistant to the higher weld temperatures present and they do not outgas, preventing weld contamination. For pre-heated chrome steel and high strength stainless steel pipe joints, HFT design and manufactures the HotPurge® range for a higher and longer temperature exposure.
Read the article online at: https://www.worldpipelines.com/product-news/25122019/huntingdon-fusion-techniques-introduce-purging-systems-for-pipes/