BLOWDOWN METHOD OF GAS PIPELINE SECTION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2021 - IPC F16L55/26 F16L55/12 

FIELD: transport machine building.

SUBSTANCE: invention relates to major gas pipeline transport and is intended for removal of hydrocarbon gas from gas pipeline section in preparation for repair, connected with replacement of pipe sections or making frames. Method of releasing gas pipeline section from natural hydrocarbon gas and filling it with nitrogen in preparation for overhaul, as well as removal of nitrogen and filling of section with natural gas after completion of repair works consists in the fact that when natural gas is displaced to the adjacent section of the gas line to separate the volume filled with nitrogen from the volume filled with methane, a device is used—an elastic hollow sphere introduced through an additional nozzle, connected to gas pipeline by means of pressure tapping device, and when gas pipeline section is filled with natural gas reduction of its calorific value caused by nitrogen impurities is compensated by addition of propane vapor to gas line. Device for separation of natural gas and nitrogen volumes in gas pipeline cavity—elastic hollow sphere, has in its structure electric compressor, accumulator, acoustic radiator, inlet and outlet valves, differential pressure sensor, timer, relay, connecting wires, strong flexible shell. For its introduction into gas line and extraction from gas line there are no chambers of pistons start-up and intake.

EFFECT: method of blowing a section of a gas pipeline and a device for its implementation are proposed.

1 cl, 2 dwg