The TARL procedure is as follows:
- Launch a pig train into an isolated prepped distribution mains from an assembly fixed to an upstream fire hydrant or hot tap.
- The train contains a “compartment” of special viscous curing substances lodged between the pigs.
- The substances operating under pressure, penetrate leaky joints, fittings & service connections and plug the leaks.
- Pig train is extracted through a downstream fire hydrant.
- Substance hardens and leaks are permanently cured