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AssigneeAleksandr Georgievich Chuiko
InventorsAleksandr Georgievich Chuiko, Anastasia Aleksandrovna Chuyko
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A pipeline construction usable for internally insulating a welded joint between pipes with an internal protective coating. A device for internally insulating a welded pipeline joint includes a sealing assembly including a cylindrical housing and a coaxially-fastened cylindrical working member that radially expands upon generation of excess pressure in a cavity thereof. Inside the housing are a sealing compound feed assembly, a dosing device formed by a piston assembly for sealing compound components, and a pneumatic control assembly. In the dosing device, working cavities for each component are connected to the feed assembly. The elastic working member has a conduit connected to the feed assembly for feeding sealing compound into an annular gap in a welded joint region, and a conduit for pumping air out of the gap. The pneumatic control assembly controls dosing device and feed assembly functioning and generates excess air pressure in the working member cavity.
A device for internal isolation of a pipeline welded joint that comprises a sealing unit including a cylindrical casing and a coaxially mounted cylindrical elastic actuator designed to expand radially when excess pressure is created in a cavity of the coaxially mounted cylindrical elastic actuator, a compound feeding unit, a compound dosing unit and a pneumatic automation unit located in the casing, dosing unit operating cavities for each compound component are connected to the compound feeding unit, the coaxially mounted cylindrical elastic actuator has a channel for feeding the compound in an annular space in the area of the pipeline welded joint, the annular space being connected with the compound feeding unit and with a channel for gas evacuation from the annular space, the compound dosing unit comprises a cylindrical casing with a piston assembly installed in the compound dosing unit, which includes two pistons mounted hermetically in the cylindrical casing of the compound dosing unit, the pistons are connected by a rod installed hermetically inside an annular cavity separator mounted on the inside surface of the cylindrical casing of the compound dosing unit, a piston operating cavity is located between the first piston and the compound feeding unit, a rod operating cavity is located between the second piston and the annular cavity separator, a piston drive cavity is located between the second piston and the pneumatic automation unit, and a rod drive cavity is located between the annular cavity separator and the first piston, with the piston operating cavity and the rod operating cavity connected with the compound feeding unit and the piston drive cavity and the rod drive cavity connected with one another and the pneumatic automation unit, and the pneumatic automation unit is designed to control operation of the compound dosing unit and the compound feeding unit and to control creating excess air pressure in the cavity of the coaxially mounted cylindrical elastic actuator.
Dependencies are inferred from the claim text.