TAG The Double Seal System

Sizes: ¾ to 12” (16 to 320mm)

Purge pipes fast with minimal gas usage

TAG also manufactures The Silicone Double Seal purging system that has been designed to further reduce both inert gas use and purging time. These systems, use silicon discs to form an air tight seal, reducing purge times, and gas usage for maximum efficiency.

There are 2 styles of silicon double seal systems available:

The Gas Finger system is designed for small pipes and tubes from 16 to 38mm i/d

The Double Seal systems are made for pipes from 3/4 to 12" (16 to 320mm)


TAG The Double Seal System

Features and Advantages

  • Typical purge times of less than 2 minutes (e.g. an 8" Pipe will purge to below 0.01% Oxygen in less than 2 minutes)
  • High quality silicon sealing disks that prevent them tilting or falling over inside the pipe
  • Guaranteed gas tight seal
  • UV and temperature resistant up to 330ºC continuously or 450ºC for short periods
  • Suitable for purging pipes, elbows and fittings
  • The silicon seal units can be separated and used as a gas finger and pipe stopper respectively

How it works

The gas inlet and outlet are provided with twin sealing discs separated by a flexible, rigid or a spring-type tube. The design also guarantees that at least one disc will always remain tight to the pipe wall creating a 100% seal. The discs are UV and temperature-resistant up to 330ºC for up to one hour. The gas is diffused into the chamber via the built in sintered diffuser and exits through the exhaust holes in the secondary twin disc unit.
This process of gas diffusion provides an even flow of gas and prevents any gas turbulence behind the weld, thereby minimising the risk of oxygen in the welding chamber while, at the same time, achieving an extremely short purge time. These extremely short purge times result in valuable cost savings in gas and time.
Besides the very short purging time, the Silicon Seal System also offers the possibility to cover various nominal pipe diameters by one pair of baffles enabling highly economic use of the device.
The double seal system can be purchased individually or in kit form for a range of pipe diameters.

The Double Seal System Options

Sizes and Specification
DS16-19 Flex 16—19mm 100mm
DS19-24 Flex 19—24mm 100mm
DS24-29 Flex 24—29mm 100mm
DS29-34 Flex 29—34mm 100mm
DS34-38 Flex 34—38mm 100mm
DS38-43 Flexible and Rigid 38—43mm 120/60mm
DS43-48 Flexible and Rigid 43—48mm 120/60mm
DS47-53 Flexible and Rigid 47—53mm 120/60mm
DS52-58 Flexible and Rigid 52—58mm 120/60mm
DS64-72 Flexible and Rigid 64—72mm 120/60mm
DS78-86 Flexible and Rigid 78—86mm 120/60mm
DS90-101 Flexible and Rigid 90—101mm 150/100mm
DS100-112 Flexible and Rigid 100—112mm 150/100mm
DS120-130 Flexible and Rigid 120—130mm 150/100mm
DS124-138 Flexible and Rigid 124—138mm 150/100mm
DS144-155 Flexible and Rigid 144—155mm 150/100mm
DS150-165 Flexible and Rigid 150—165mm 150/100mm
DS197-206 Flexible and Rigid 197—206mm 150/100mm
DS209-220 Flexible and Rigid 209—220mm 150/100mm
DS246-257 Flexible and Rigid 246—257mm 150/100mm
DS260-280 Flexible and Rigid 260—280mm 150/100mm
DS290-320 Flexible and Rigid 290—320mm 150/100mm
DSK16-165 Complete Kit 16—165mm 120/60 150/100mm
DSK16-220 Complete Kit 16—220mm 120/60 150/100mm
DSK16-320 Complete Kit 16—320mm 120/60 150/100mm


Links here


Pipe Purging Equipment

prev next

Featured News


e-mail us some pictures of our equipment in use, and if we use them on the website, or in any of our literature we'll give you a £50 credit against your next order!!!

Featured News


The latest addition to TAG Pipe’s range - rapid fit up, pipe-welding alignment clamps, is the latest version of the ‘E-Z’ Fit Red. Boasting a range of 1" to 12" in just 3 clamps! The new ‘E-Z’ Fit Red can be used on stainless steel without any additional accessories, preventing contamination of the pipe during fit up.