COATING APPLICATION ON PIPELINE INNER SURFACE WITH HELP OF STEAM AS HEAT CARRIER Russian patent published in 2015 - IPC F16L55/165 F16L58/10 

FIELD: transport.

SUBSTANCE: proposed method comprises fitting of lining sleeve into the pipeline including reinforcing shell impregnated with binder and inner film shell that can be separated from said reinforcing shell after hardening. Said sleeve as-fitted in is inflated by air and filled with steam. It is held to binder hardening. Now, inner film shell is removed. Filing with steam is executed in two steps. At first step, steam overpressure inside the sleeve is smoothly increased to 0.4-0.6 of pressure P whereat said sleeve is held till binder hardening. Smooth pressure increase is performed for time interval T₁ = (2.0÷2.7)·L·D², where L is the length of pipeline under repair, m; D is pipeline ID, m. At second step, pressure inside the sleeve if increased to P for T₂ = (0.4÷0.8)·T₁. At holding the inflated sleeve to binder hardening, it is intermittently purged with steam for removal of produced condensate.

EFFECT: higher quality of coating.

5 cl, 2 dwg