Flowstopping

FOAMBAG™

FOAMBAG™ being filled with expanding resin foam

FOAMBAG™ being filled with expanding resin foam

Some four decades ago, we developed a low-cost flow stopping system called FOAMBAG™ based on the use of expanding resin foam. The effective yet simple technique works on all types of pipe material including cast iron, steel and PE. Extremely versatile, it can be used on vertical or tapering pipes, bends and non-standard diameters.

The major advantage of using FOAMBAG™ over conventional flow stopping bags is that far less pipe needs to be exposed resulting in considerably smaller excavations and reduced reinstatement costs. FOAMBAG™ has become an industry standard technique in the UK and has been used in many areas overseas including mainland Europe, the USA, Scandinavia and the Far East.

The technique works by inserting a semi-porous bag into the pipe to hold the foam in place as it expands. At full expansion, some of the foam seeps through the semi-porous material to adhere to the pipe wall.

Although developed for flow stopping natural gas pipes, FOAMBAG™ can also be used to seal pipes carrying other gases and fluids.

Benefits

  • Systems meet UK gas industry standard T/SP/E/59
  • Low cost, safe and easy to use
  • Well proven technique
  • Kits available for pipe diameters up to 10”
  • Ideal where space is limited—needs less pipe length exposed than conventional methods
  • Suitable for non-standard sizes, tapers, bends and vertical pipework

Specification Patent No. 2157390

Downloads & Video

Hot Tapping & FOAMBAG™ Demonstration

FOAMSTOP™

Pipe sealed using expanding resin foam

Pipe sealed using expanding resin foam

FOAMSTOP™ provides a ‘no gas’ method of flow stopping, for small diameter pipes of 3/4″ to 2”, running at low pressures.

Benefits

  • Systems meet UK gas industry standard T/SP/E/59
  • Low cost, safe and easy to use
  • Well proven technique
  • Kits available for pipe diameters up to 2”
  • Ideal where space is limited—needs less pipe length exposed than conventional methods
  • Suitable for non-standard sizes, tapers, bends and vertical pipework

Downloads & Video

FOAMSTOP™ - Demonstration

Live Stub End Abandonment

Diagram showing placement of foam during Stub End Abandonment

Diagram showing placement of foam during Stub End Abandonment

This technique is offered as a Contract Service for the final abandonment of short live short stub ends of gas mains, typically 2 to 20 metres in length. The technique was developed by Steve Vick International in collaboration with National Grid Gas as a means of avoiding unacceptable disruption caused by excavation, for example at busy road junctions.

Using our proven resin foam technology in conjunction with CCTV equipment, it is possible to excavate down to the stub end from a non-sensitive location. It can then be rendered gas free from the point where it meets the parent main to the cap end previously fitted, preventing further leakage problems.

Benefits

  • Enables short, live sections of unwanted main to be finally abandoned
  • Abandonment carried out remotely from a nearby ‘non-sensitive’ position
  • Ideal in locations in close proximity to petrol stations, hospitals etc, or other locations where disruption would be unacceptable
  • Entire section filled with foam to avoid possibility of future leakage
  • Trenchless technology – reduces excavation
  • Carried out by Steve Vick International’s Contract Service teams

Process meets GIS/TE/E1.9 Specification.

Downloads & Video

ENHANCED SEAL

This technique is used for the safe, remote, 100% abandonment of unwanted sections of gas main, including the last transition joint.

Enhanced SEAL was developed by Steve Vick International in conjunction with Northern Gas Networks.  It provides a safe and effective method of abandoning 100% of T1 gas mains under ‘live’ conditions, without removing the tee piece.

It is often impractical to disconnect a redundant main directly at the tee piece, where it is often located under a busy junction or is in a sensitive area where disruption caused by the work would be unacceptable.

Full abandonment of these short sections of main is important if leakage problems are to be avoided in the future.

Using advanced CCTV technology, accurate measurements of the pipe’s internal diameter can be recorded, including any tapers. This enables the Enhanced SEAL technique to fully abandon Tier 1 pipe at the last transition joint between the T2/3 and Tier 1 main.

Benefits

  • Abandonment carried out remotely from a nearby ‘non-sensitive’ position up to 60m away from the parent main
  • Safety is significantly improved by sealing the last transition joint between the T2/3 and T1 pipe, any risk of a gas leak is removed
  • Size of excavation is kept to a minimum, reducing impact on the environment
  • Cost savings are gained by reducing reinstatement, traffic management and time on-site
  • Less disruption to customers and the public by excavating in non-sensitive areas

Downloads & Video

Enhanced SEAL - Demonstration

Mini Purge Ejector

Mini Purge Ejector process

Mini Purge Ejector process

Our Mini Purge Ejector is designed as an alternative to the large purge ejectors which have been in use since the mid 1980s.

It works on the same Venturi principle but is lighter and easier to handle. Designed for use on mains from 3” to 12” in diameter, it ensures an efficient purge of gas mains to be abandoned.

Benefits:

  • Considerably smaller and lighter than traditional purge ejectors
  • Easy to handle by one operative
  • Takes up significantly less space in vehicles
  • Extension tubes may be added to achieve required, safe height above the trench
  • Effective in purging mains from 75mm to 300mm (3” to 12”) in diameter

Downloads & Video