In 2019, Hydroremont IG Ltd. successfully performed an underwater operation to connect the gas production facilities of the Kaliakra-2 gas
field, located at a depth of 73 m, to the existing gas transmission infrastructure.
For this purpose, the following types of activities were performed:
Vessel mobilization (DSV) incl. accurate positioning above work area.
Decommissioning of existing hydraulic lines with diameter 1”.
Performing underwater inspections with a remote control device
(ROV), on the seabed intended for laying the tubular isometry
(tubular system with a complex spatial shape, composed of tubes with
nominal diameter - 10 ").
Laying on the seabed of new hydraulic lines, connecting hydraulic lines to existing underwater gas production facilities at the Kaliakra-2 gas field.
Preparation of existing gas production facilities for connection to
Lowering the tubular isometry.
Connection to the existing - gas production facility.
Demobilization of the vessel and work teams.
Purpose of the repair - restoration of the water tightness of the joints in the sections with watertight joints on a double channel for technical water supply. The repair was carried out with LECO materials of "Lestin & Co" Austria in conditions of constant operation of the hydraulic facility, given its importance. The joints were treated with LECO materials under conditions of continuous and strong water flow in the double channel. This shows the complexity of the task, which was performed very precisely and professionally. The site was completed in accordance with the rules for safety, control and quality of work in operational conditions of “Kozloduy NPP”.
Registered inspections of the platform - including diving inspection of the columns, cathodes, flanges, connections and the condition of the paint.
Operational maintenance of the underwater equipment of the platform and the gas fields.
Diving inspection of the connections between the three columns and the primer slab and measurement of the capping mass on the slab.
Inspection of the vertical part of the pipeline and the fixing brackets.
Thickness of horizontal pipeline and vertical pipeline, risers and production pipes.
Laying and removal of pipeline on the shore.
Replacement of a defective section.