Gaseal – gas line repair without destroying the pavement
Energy repair crews are increasingly cost conscious as they try to repair more leaks within budget and time restrictions. To facilitate this, Gaseal® allows repair with minimal destruction of the street.
Permabond Gaseal anaerobic sealant was introduced to allow repair by drilling through the top of the bell. Gaseal was then injected into the bell joint. This improved the process by eliminating the need to under mine (clear underneath) the pipe. The drawback with anaerobic sealant is that it only works on cast iron bell joints. Not on in line pin-hole leaks, couplings or fittings which are generally steel.
The encapsulation processes involves placing an encapsulation bag around the pipe and injecting the bag with urethane sealant.
The bags are not simple paper sacks they are high tech, durable, patented fabrics, with specific closure methods designed for the application process of choice. Originally, large trenches (3’ by 3’ or 4’ by 4’) were dug to expose the pipe and joints to allow repair. The crew would go into the hole and using hand tools attach the bag and inject the sealant.
Both cast iron bell joints and a variety of steel clamps, pipes and service connections can now be repaired through small holes with encapsulation.
Square 1’ by 1’ holes improved the time required as well as reduced the risk of injuries from men working underground. The sealing technology didn’t change but tools were developed to fix the bag and inject the sealant from the street. Over time pavement cracks from the corners of these squares may need some subsequent attention.
As surgeons began doing less invasive surgery on humans, utility crews were doing less invasive repair of pipeline.
If less invasive surgery was the buzzword of the 90’s minimally invasive surgery the buzzword of the 00’s.
So like the surgeons, the energy industry stepped it up another notch with cored hole repair. Although the hole is almost the same size, the shape is the key improvement. A service truck equipped with a special drill and vacuum cores into the pavement removing a perfect circle of pavement and underlayment. After the work is complete the plug is put back into the hole without weakening the surrounding pavement.
With the original repair process one leak could be filled per day. The cored hole process allows up to 4 leaks per day with a smaller crew and leaves the street intact.
For further help and advice, please contact Permabond.