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.