Stub End Solutions

It is often impractical to excavate directly above a main or tee piece. This may be because the main is located under a busy junction or is in a sensitive area such as near a petrol station or where disruption caused by the work would be unacceptable.

The Steve Vick International Contract Service  offer a number of solutions to the problems associated with these challenging operations, using various remote methods.

Enhanced SEAL

Enhanced SEAL

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.

Downloads & Video

Enhanced SEAL - Demonstration

Stub End Abandonment (Remote FOAMBAG™)

Stub End Abandonment (Remote FOAMBAG™)

Stub End Abandonment (Remote FOAMBAG™)

For the secure and final abandonment on short stubs of live gas main, Live Gas Stub End Abandonment (or Remote FOAMBAG™) is a well proven technique deployed by the Steve Vick International Contract Service team.

The technique is remotely carried out from a safe location and is suitable for use on low pressure systems from 3”-12” diameter; typically employed on short ‘stub ends’ of two to 20 m in length.

CCTV equipment is used in combination with the SVI FOAMBAG™ technique to complete the sealing off operation.

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SEALBACK™

Live mains replacement using the SEALBACK™ technique

Live mains replacement using the SEALBACK™ technique

SEALBACK™ is a technique used by the Contract Services to remotely carry out live mains replacement. The technique is especially applicable for traffic sensitive locations.

P.E pipe is inserted from a remote location (3m-13m) into an old cast iron main. A SEALBACK™ nose cone is inserted into the end of the P.E pipe which in turn is inserted into the old cast iron main through a gland box.

Gas supplies to customers are uninterrupted while the operation takes place and the final gas seal is achieved through the introduction of Steve Vick International patented expanding foam into the annular space.

Advantages of using the SEALBACK™ technique include:

  • Reduced project costs
  • Reduced time customers are off gas
  • Reduced disruption to traffic

Downloads & Video

Pipe Inspection

CCTV camera system used for pipe inspection of PE and metallic mains

CCTV camera system used for pipe inspection of PE and metallic mains

Our Contract Service team carries out CCTV camera surveys on 3”-18” metallic pipe and 63mm-180mm P.E pipe. The CCTV systems are ‘live gas’ approved and enable accurate mapping of internal mains, quickly identifying any obstructions, poor pressure or leaks.

Mapping internal pipework can prevent unnecessary excavation, and ultimately reduce costs. The footage produced is in colour and the technology used is ‘auto uprighting’ to ensure a true image of the main is received.

Steve Vick International flowstopping techniques can be used to stop gas flow where needed or the camera can be inserted through a 2” BSP tapping using a Wask Tee Set.

 

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