METHOD OF GAS DISPLACEMENT FROM A SECTION OF GAS PIPELINE THAT IS BEING PUT TO REPAIR AND SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC F17D1/02 F17D3/08 

FIELD: repairs.

SUBSTANCE: group of inventions relates to the field of operation and repair of existing gas pipelines and can be used to displace gas from a section of an existing gas pipeline before putting it into repair. Piston sealer is stored in the operating gas pipeline through the launch chamber and by the pressure of the gas it is moved along the pipeline for the linear valve at the beginning of the section to be repaired, after which the latter is closed. Carry out the movement of the piston-sealer under the action of air pumped by a mobile air compressor unit, with a pressure value that provides the minimum allowable flow rate at the inlet to the gas pumping unit of the compressor station, located outside the area to be repaired. In the process of displacing the main gas, the differential pressure between the cavity of the piston-sealer and the pumped main gas in the gas pipeline is monitored. When the maximum permissible value of the pressure drop is reached, air is removed from the cavity of the piston-sealer of the media to the area of the section to be removed for repair, filled with air pumped by a mobile air compressor unit. System has also been proposed for displacing gas from a section of a trunk gas pipeline that is being repaired.

EFFECT: technical result consists in minimizing gas losses, preventing the possibility of the formation of an explosive gas-air mixture, and eliminating the ingress of impurities into the transported gas; also reduced the amount of additional equipment involved.

2 cl, 2 dwg