Double Seal Systems

RANGE: ¾ - 12" / 16 - 320 mm

Pipe Purge Masters’ Silicone Double Seal Purging Systems are engineered for superior efficiency, reducing both inert gas consumption and purging time. These systems use high-quality silicone discs to create an airtight seal inside the pipe, ensuring a clean, controlled environment for precision welding.

The Gas Finger system is designed for small pipes and tubes from ¾ to 1.5 inches (16 to 38 mm). The Double Seal system is ideal for larger pipe diameters from ¾ to 12 inches (16 to 320 mm).

Whether used in workshop fabrication or field welding, the Double Seal range delivers consistent and cost-effective results every time.

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Product Advantages

Purge pipes fast with minimal gas usage

PPM also manufactures the silicone Double Seal purging system that has been designed to further reduce both inert gas use and purging time. This system uses silicon discs to form an airtight 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 ¾ – 1.5″ / 16 – 38 mm
The Double Seal system is made for pipes from ¾ – 12″ / 16 – 320 mm

Features and advantages

Extremely short purge times resulting in valuable cost savings
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 discs that prevent them tilting or falling over inside the pipe
Guaranteed gas tight seal
UV and temperature resistant up to 330ºC (626ºF) continuously or 450ºC (842ºF) 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
Fully interchangeable and individually exchangeable system, reducing cost of ownership

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 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 (626ºF) continuously or up to 450ºC (842ºF) for short periods. The gas is diffused into the chamber via the built-in centred diffuser and exits through the exhaust holes in the secondary twin disc unit.

This extremely short process of gas diffusion provides an equal gas flow and prevents any gas turbulence behind the weld, thereby minimising the risk of oxygen re-entering the welding chamber.

Besides the very short purging time, the double seal system also offers the possibility to cover various nominal pipe diameters by one pair of seals 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.

Specifications

Double seal kits – RECOMMENDED

Part No.	Description	Pipe I/D range	Weight
DSK16-165	Double Seal Kit – complete kit 16 – 165 mm i/d	0.62 – 6.49″ / 16 – 165 mm	24 lbs / 11.00 kg
DSK16-220	Double Seal Kit – complete kit 16 – 220 mm i/d	0.62 – 8.66″ / 16 – 220 mm	33 lbs / 15.00 kg
DSK16-320	Double Seal Kit – complete kit 16 – 320 mm i/d	0.62 – 12.59″ / 16 – 320 mm	42 lbs / 19.00 kg

Double seal gas fingers

Part No.	Description	Pipe I/D range	Weight
DSF16-19	Double Seal Gas Finger 16 – 19 mm i/d	0.62 – 0.74″ 16 – 19 mm	0.5 lbs / 0.20 kg
DSF19-24	Double Seal Gas Finger 19 – 24 mm i/d	0.74 – 0.94″ 19 – 24 mm	0.5 lbs / 0.20 kg
DSF24-29	Double Seal Gas Finger 24 – 29 mm i/d	0.94 – 1.14″ 24 – 29 mm	0.5 lbs / 0.20 kg
DSF29-34	Double Seal Gas Finger 29 – 34 mm i/d	1.14 – 1.33″ 29 – 34 mm	0.6 lbs / 0.30 kg
DSF34-38	Double Seal Gas Finger 34 – 38 mm i/d	1.33 – 1.49″ 34 – 38 mm	0.6 lbs / 0.30 kg

Double seal purge system

Part No.	Description	Pipe I/D range	Weight
DS16-19	Double Seal purge system – Flexible 16 – 19 mm i/d	0.62 – 0.74″ / 16 – 19 mm	1.5 lbs / 0.65 kg
DS19-24	Double Seal purge system – Flexible 19 – 24 mm i/d	0.74 – 0.94″ / 19 – 24 mm	1.5 lbs / 0.70 kg
DS24-29	Double Seal purge system – Flexible 24 – 29 mm i/d	0.94 – 1.14″ / 24 – 29 mm	1.5 lbs / 0.75 kg
DS29-34	Double Seal purge system – Flexible 29 – 34 mm i/d	1.14 – 1.33″/ 29 – 34 mm	1.5 lbs / 0.75 kg
DS34-38	Double Seal purge system – Flexible 34 – 38 mm i/d	1.33 – 1.49″ / 34 – 38 mm	1.5 lbs / 0.80 kg

DS38-43 to DS290-320 are supplied with rigid connector as standard
Optional flexible connectors are available as accessory in two lengths FC120 (4.7″/ 120 mm) / FC240 (9.4″ / 240 mm)

Part No.	Description	Pipe I/D range	Weight
DS38-43	Double Seal purge system – Rigid 38 – 43 mm i/d	1.49 – 1.69″ / 38 – 43 mm	1.5 lbs / 0.85 kg
DS43-48	Double Seal purge system – Rigid 43 – 48 mm i/d	1.69 – 1.88″ / 43 – 48 mm	2 lbs / 0.90 kg
DS47-53	Double Seal purge system – Rigid 47 – 53 mm i/d	1.85 – 2.08″ / 47 – 53 mm	2 lbs / 0.95 kg
DS52-58	Double Seal purge system – Rigid 52 – 58 mm i/d	2.04 – 2.28″ / 52 – 58 mm	2 lbs / 1.00 kg
DS64-72	Double Seal purge system – Rigid 64 – 72 mm i/d	2.51 – 2.83″ / 64 – 72 mm	2 lbs / 1.10 kg
DS78-86	Double Seal purge system – Rigid 78 – 86 mm i/d	3.07 – 3.38″ / 78 – 86 mm	3 lbs / 1.20 kg
DS90-101	Double Seal purge system – Rigid 90 – 101 mm i/d	3.54 – 3.97″ / 90 – 101 mm	3 lbs / 1.30 kg
DS100-112	Double Seal purge system – Rigid 100 – 112 mm i/d	3.93 – 4.40″ / 100 – 112 mm	3 lbs / 1.40 kg
DS120-130	Double Seal purge system – Rigid 120 – 130 mm i/d	4.72 – 5.11″ / 120 – 130 mm	3 lbs / 1.50 kg
DS124-138	Double Seal purge system – Rigid 124 – 138 mm i/d	4.88 – 5.43″ / 124 – 138 mm	3 lbs / 1.60 kg
DS144-155	Double Seal purge system – Rigid 144 – 155 mm i/d	5.66 – 6.10″ / 144 – 155 mm	4 lbs / 1.70 kg
DS150-165	Double Seal purge system – Rigid 150 – 165 mm i/d	5.90 – 6.49″ / 150 – 165 mm	4 lbs / 1.80 kg
DS197-206	Double Seal purge system – Rigid 197 – 206 mm i/d	7.75 – 8.11″ / 197 – 206 mm	4 lbs / 2.00 kg
DS209-220	Double Seal purge system – Rigid 209 – 220 mm i/d	8.22 – 8.66″ / 209 – 220 mm	5 lbs / 2.20 kg
DS246-257	Double Seal purge system – Rigid 246 – 257 mm i/d	9.68 – 10.11″ / 246 – 257 mm	5 lbs / 2.40 kg
DS260-280	Double Seal purge system – Rigid 260 – 280 mm i/d	10.23 – 11.02″ / 260 – 280 mm	5 lbs / 2.60 kg
DS290-320	Double Seal purge system – Rigid 290 – 320 mm i/d	11.41 – 12.59″ / 290 – 320 mm	6 lbs / 3.00 kg