Press

Large Diameter Pipework Fabrications

Posted by Michaela Reay

05-Dec-2018

huntingdonfusion.com


Large diameter pipework can cause several challenges, especially when those pipes are manufactured from stainless, duplex and chrome steels, titanium or zirconium. When welding such reactive materials, they need to be purged of oxygen before, during and after welding.

It is not cost effective to completely fill pipework with expensive inert gas, so weld purging experts Huntingdon Fusion Techniques developed QuickPurge® Systems to dramatically reduce the space that needs to be purged. 

Ron Sewell, Chairman for HFT® said: “Using QuickPurge® means there is no longer a need to fill complete pipework fabrications with an inert gas. These devices localise the gas purging to a space about 10” (250 mm) either side of the weld to reduce purging time dramatically, making huge savings in both purging time and gas costs.”

“They are so efficient that they pay for themselves in the first couple of welds in gas savings alone, whatever the pipe size. QuickPurge® is simply inserted into a pipe, inflated within, restricting the volume around the weld and removing the oxygen down to 30 ppm (parts per million) within minutes. For example, a 36” diameter stainless steel pipe can be purged ready for welding in under 32 minutes.”

Filling the tube with argon or purging with old-fashioned foam dams or other homemade devices will take many hours. Old-fashioned purge dams contain water vapour and air that outgas during the weld process causing oxidation that shows up as discolouration around the weld, which then needs to be cleaned with grinding tools, wire brushes, or chemical solutions causing an extra cost.

Some features of QuickPurge® Systems include: 

  • An additional gas input line, allowing extra purge gas to be introduced for extra high speed purging down to the lowest oxygen levels, which is perfect for larger diameter pipes where quality welds are required. This extra cold argon gas input is perfect for mitigating the extra heat produced by the Plasma / TIG process.
  • The advanced design of the QuickPurge® System means that oxygen levels as low as 30 parts per million (ppm) can be reached every time, allowing zero colour welds to be achieved with no loss of corrosion resistance.
  • IntaCal® combined with the integrated PurgeGate® device makes it possible to safely inflate the systems with argon gas, for sealing and then purging the space between the dams where the weld joint is located. With PurgeGate®, any risk of over inflation is due to pressure or flow increase is eliminated.
  • All Systems are manufactured as standard with a hose for connecting a Weld Purge Monitor®, which can read oxygen levels down to as low as 1 ppm 
  • Materials used in the manufacture of QuickPurge® are such that they are resistant to the higher weld temperatures present and they don't outgas, thus preventing weld contamination.

For pre-heated chrome steel and high strength stainless steel pipe joints, HFT® manufactures the HotPurge® Systems for a higher and longer temperature exposure.


Visit source site

huntingdonfusion.com

quickpurgehuntingdon fusionweld purgingpipe purginginflatable bladder

More items from michaelareay


Weld Purging Post Weld Heat Treated (PWHT) Pipework

Welding processes can weaken metals by imparting residual stresses into a material, leading to a reduction in corrosion resistance properties. Post Weld Heat Treatment (PWHT) is regularly used to retain the strength of a metal when welding certain materials including high strength stainless steel a ...

Michaela Reay


Posted 2 days agoPress > weld purgingpwht pipeworkhotpurge +1

Weld Purging: Replace Paper, Foam and other unsuitable Materials with Argweld® Weld Purge Dams

Weld Purging is essential when welding tubes and pipes made of reactive metals such as stainless steels, titanium and zirconium. Usually weld zones are confined with purge dams so that the use of argon purge gas is limited and waiting times are reduced. Homemade dams fabricated from paper, sponge ...

Michaela Reay


Posted 9 days agoPress > huntingdonhuntingdon fusionHFT +2

Oxidation Free Weld Beads with Weld Backing Tape™

Welders are often faced with challenges where high quality stainless steel, duplex and chrome steel welds are required, but where the use of purge gas is not always possible. One solution to this problem is the use of Argweld® Weld Backing Tape™ from Huntingdon Fusion Techniques HFT®. This high te ...

Michaela Reay


Posted 15 days agoPress > huntingdon fusionweld backing tapebacking tape +2

Fast, Reliable and Safe Stopping of Pipe Contents with Inflatable Rubber Plugs

Sealing, stopping and blocking pipes where oils, hydrocarbons and petrochemicals are present can cause major inconveniences with many normal stoppers not being able to handle such conditions. The Pipestoppers® Division at Huntingdon Fusion Techniques HFT® manufactures a Range of Inflatable Rubber ...

Michaela Reay


Posted 21 days agoPress > pipe stoppersinflatable pipe plugspipe blocking +1

Long Distance Weld Purge Monitoring

Often when welding lengths of tubes and pipework fabrications of 20 metres or more, measuring the purge gas might not always easy. Under these conditions, there is a risk of contamination of the gas exiting the weld zone, leaving the welders uncertain about their welds and welding procedure.  Weld ...

Michaela Reay


Posted 29 days agoPress > purgeyeweld purgingweld purge monitor +1
All posts from michaelareay