Tacquet-Industries

Rehabilitation of a turbine COO

REHABILITATION OF A TURBINE

A final intervention to finish the year 2024, machining of group 2 of the magnificent Coo Trois-Ponts power plant.

Rehabilitation for a future overpower:
1st step machining of the labyrinth with different bores (about 2500mm diameter) and surface to be realized.
2nd stage machining of the holes at the level of the spiral tarpaulin. (5500mm diameter)

PRE-WORK & MACHINE SETUP

Installation of our machine in the turbine and adjustment with the help of the Laser Tracker

Control and adjustment of the G1 rotor shaft.

Labyrinth Inspection and Adjustment


As part of a technical on-site intervention, a complete metrology inspection was carried out on the fixed parts of unit G1, followed by an adjustment and finishing phase. The operation took place over several days and involved various stages of measurement, machining, and final validation.

The process began with an initial dimensional survey to assess the condition of the component prior to intervention. A machine adjustment phase was then implemented to ensure precise surface preparation before cladding. This was followed by finishing machining operations and a final inspection after surface treatment, all performed in a controlled industrial environment.

Each stage was accompanied by rigorous tracking of geometric references, using a reference system adapted to the functional orientation of the part. A laser tracker measurement system was used to ensure the required precision at every step of the process.

In parallel, a final dimensional inspection was carried out on the entire G1 unit, including checks on critical geometries, assessment of angular positions of drilled holes, and overall validation after machining. All scheduled measurements were completed in accordance with the control plan requirements.

This operation is part of a broader effort to restore technical compliance and secure the mechanical components of the plant, ensuring their optimal integration within the overall system.

Intervention of 20 December 2024

Control the DIM and GEO wheels, Francis.

Geometric and Dimensional Inspection of a Francis Runner

As part of a specialized metrology operation, a comprehensive geometric and dimensional inspection was carried out on a Francis runner, a key component of a hydraulic turbine.

The purpose of this intervention was to verify the conformity of the runner’s surfaces and blades, ensuring adherence to manufacturing tolerances and overall uniformity. These criteria are critical to guarantee hydraulic performance, durability, and optimal balancing during operation.

To meet these requirements, high-precision measuring tools were deployed on-site, including a laser tracker, enabling full coverage of the component’s complex geometry.

Measurements focused on several aspects: blade profile and thickness, geometry of the support surfaces, angular distribution, and analysis of overall shape deviations. All data was compiled into a dedicated report designed to assist technical teams in validating, monitoring, or adjusting the component as needed.

This type of inspection helps secure the assembly or recommissioning phases by providing a reliable and documented database of the runner’s actual condition.

Intervention of 18 December 2024

Rotor shaft machining

Rotor Shaft Machining

As part of a project conducted at a hydroelectric site, an intervention was carried out on the rotor shaft of a generating unit. The objective was to restore a functional surface through a series of coordinated operations, including machining, material build-up, and finishing.

The operation followed several key stages:

  • Initial machining of the affected bearing surface, to prepare it for corrective treatment.

  • Copper build-up, performed by the client, to locally restore material on the functional zone.

  • Final finishing machining, to achieve the required dimensions and tolerances, with precision adapted to the interface specifications.

The operations were performed using an orbital machining system mounted on a dedicated support, with alignment carried out using a laser tracker to ensure precise positioning relative to the shaft axis. The entire intervention took place in a secured environment, with specific arrangements to ensure equipment stability and operator safety.

This type of service illustrates our ability to carry out geometric rehabilitation operations under real-world conditions, meeting high technical standards and contributing to the reliability of critical hydromechanical components.

December 2024