APPLICATION METHOD OF COATING TO INNER SURFACE OF PIPELINE Russian patent published in 2013 - IPC F16L55/165 F16L58/10 B29C63/36 

FIELD: machine building.

SUBSTANCE: folded flat tubular sleeve made from the material soaked with curable bonding agent and enclosed in a flexible polymer cover is introduced inside the pipeline by being turned out. Cap end of the sleeve is fixed and the sleeve is moved inside the pipeline, unfolded and pressed to inner surface of the pipeline due to water pressure on inner surface of the turned-out sleeve. At binding-up the tail end of the sleeve, a branch pipe is inserted into it so that inner cavity of the sleeve can be interconnected with external environment through the branch pipe hole. That hole is plugged prior to turning-out of the tail end of the sleeve and removed from the plug after complete unfolding and pressing of the sleeve to inner surface of the pipeline. The sleeve is cured with circulating hot water; at that, water is passed through the branch pipe hole.

EFFECT: reduction of the number and sizes of folds of the sleeve coating at turns of the pipeline; improvement of passage efficiency of those sections by the sleeve.

2 dwg