FIELD: machine building.
SUBSTANCE: procedure for bleeding sections of gas pipelines in multi-line systems of gas mains refers to pipeline transport of gas and can be implemented in bleeding sections of pipelines in multi-line systems of gas main where parallel lines are tied with bridges in places of shut-off devices arrangement before preventive inspections or recovery works. The procedure for bleeding sections of gas pipelines in multi-line systems of gas mains consists in shut-off the bleeding section of one of the lines of the gas pipeline at its input by means of shut-off devices, in directing gas through the bridges between the lines to bypass of the bleeding section via parallel lines of the gas pipeline, in disconnection of the bleeding section at its output from the parallel lines of the gas pipeline by means of shut-off devices in the bridges, and in disconnection of all further located sections of the line containing the bleeding section along all path from the bleeding section to the nearest gas-transfer station in the direction of gas transport from the parallel lines. Thus, the bleeding section and adjacent sections disconnected from the parallel lines and located further in the direction of gas transport are connected with an input collector of the supercharger of the gas-transfer station, the nearest and the first in the direction of gas transport. Further, with the shut-off device one of the lines of the gas pipeline is shut-off at the output from and behind the gas transfer station, the first in the direction of gas transport from the bleeding line. By means of the shut-off devices in the bridges this line is disconnected from parallel lines of the gas pipeline along the whole path to the gas transfer station, the next and second in the direction of gas transport from the bleeding section. At the output this line of the gas pipeline is connected with the input collector of the gas transfer station, the second one in the direction of gas transport from the bleeding section. By means of the shut-off devices a regular supercharger of the first gas transfer station is disconnected from the rest regular supercharges and its input is connected with an outlet section of the line of the gas pipeline containing the bleeding section and the adjacent sections further in the direction of gas transport. The output of this supercharger disconnected from others is connected with the input section of the line of the gas pipeline disconnected from parallel lines between the first and the second gas transfer stations. The disconnected regular supercharger pumps gas out the line of the gas pipeline containing the bleeding section and further adjacent sections disconnected from parallel lines into the line of the gas pipeline disconnected from parallel lines between the first and the second gas transfer stations within the range of operating characteristics of the supercharger and its drive. According to the procedure the bleeding section is shut-off by means of the shut-off device at its output and left gas is evacuated from it. Also, on this regular supercharger a replaceable flow part is changed to the replaceable flow part of higher degree of pressure boost before the bleeding section at its output is shut-off and disconnected from the rest regular superchargers by means of shut-off devices of the regular supercharger of the first gas transfer station and before connection of its input with the output section of the line of the gas pipeline containing the bleeding section and sections adjacent further in the direction of gas transport and also, before connection of this, disconnected from others, supercharger with the inlet section of the line of the gas pipeline disconnected from the parallel lines between the first and second gas transfer stations.
EFFECT: raised efficiency of bleeding sections of gas pipelines, maximal implementation of regular equipment, reduced or eliminated demand for additional equipment.
4 cl, 7 dwg
