FIELD: oil and gas industry.
SUBSTANCE: lubricator contains a flange, preventer, sectional inner tube, sealing device and signalling device. Signalling device consists of a body with a rotable plug, upper sealing surface, lower sealing surface with annular groove where two sealing rings are installed. The body is equipped with injection unit for pressure test fluid. At that the unit is made as a pressure fitting and channel connecting the pressure fitting with annular groove in the area between two sealing rings.
EFFECT: simplification of lubricator design, reduction of its length and weight with possibility of on-line tightness inspection of connection between signalling device and preventer after replacement of the device.
1 dwg
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