System for repairing joints in pipes laid underground

Details System for repairing joints in pipes laid underground System for repairing joints in pipes laid underground

1984-12-24

1986-04-29

Hoffman, James R.

Coating apparatus

Control means responsive to a randomly occurring sensed...

118105, 118215, B05C 1100, B05C 1102, B05C 100

Patent

active

045849633

ABSTRACT:
A system for repairing joints in pipes laid underground, such as gas pipes, in their buried state, from their inside, to ensure their sealing.
The system, in the process of pushing the resin used for repairing along the inside of the pipes by the pig, is to fill and seal the sealing material with the resin through gaps in numerous pipe joints inside of the pipes. In order to guarantee insertion of resin into gaps in the pipe joints (sealing material) whether or not the pipe joint has developed a leak, the system comprises a substitution pig, and a means whereby the pig pushes the resin placed ahead of it along the pipe, and further, a means whereby the filling amount of the resin does not change even if the amount of resin present in front of the pig differs between the early and later stages of the repairing operation, gaps in the pipe joints will be uniformly filled.

REFERENCES:
patent: 3394025 (1968-07-01), McCune
patent: 3753766 (1973-08-01), Brown et al.

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