ERECTION METHOD OF PIPELINES FROM METAL-PLASTIC PIPES Russian patent published in 2012 - IPC F16L13/02 

FIELD: machine building.

SUBSTANCE: temperature-indicating paint or a row of temperature-indicating stickers meant for colourful indication during heating of heat-affected zone above allowable temperature, for material of internal pipe lining, and temperature-indicating paint or a row of temperature-indicating stickers meant for colourful indication during heating of heat-affected zone above allowable temperature, for material of external pipe insulation, is applied in the form of strips to external metal surface of pipes along the perimetre above fastening zone of internal lining or above zone of the beginning of polymer coating and before the beginning of external insulation. Wireless temperature transmitters are fixed here too. Heat-removing compound is applied prior to welding to external metal surface of pipe in the form of strips, from edge of pipe to the first strip of temperature-indicating paint or to the first row of temperature-indicating stickers, and between strips of temperature-indicating paint or rows of temperature-indicating stickers along the perimetre in the area of butt weld. Temperature in welding zone is controlled as per the colour change of temperature-indicating paint or sticker and through wireless temperature transmitters. When allowable temperature is exceeded, welding machine is switched off manually or automatically by supplying the signal from wireless temperature transmitters.

EFFECT: possibility of preventing the pipe overheating in weld zone is provided.

2 dwg