Rehabilitation of groups (Francis type) 𝘏𝘌𝘙𝘔𝘐𝘓𝘓𝘖𝘕
Rehabilitation of groups (Francis types)
In 2021 and 2022, we intervened on the two groups (Francis types) of the Centrale
Hydroelectric power station in Hermillon, France. These operations were carried out in
the framework of the group rehabilitation by our client VOITH HYDRO.
Machining of the different elements of the tarpaulin (between 1 and 1.5mm)
- Winnowing and boring plan
- Top installation plane and reference bore
- Top sealing plane and bore
- Lower sealing plane
- Lower installation plane
- Return of diameters Ø4105mm and Ø4115mm
- Parallelism between machined planes: 0.05mm
- Bores: H8
- Surface Condition: Ra 3.2
Our intervention took place in several stages:
- Step 1: Analysis of the subject in our Design Office (feasibility, 3D modeling of the turbine, implementation of our machine in the 3D work environment).
- Step 2: Realization of pre-work checks (Laser Tracker) by our Surveyor department on site.
- Step 3: Installation of our machine on site and machining.
- Step 4: Realization of after-work checks (Laser Tracker) by an external company.
3D MODELLING
The machining to be carried out requires two positions for our machine (low position and high position).
PRE-WORK & MACHINE SETUP
The pre-work checks allowed us to determine the defects on site as well as the actual center of rotation of the turbine.
Installation of our machine in the turbine, adjustment with the assistance of our Surveyor and machining engineer.
Repeated operation for both machine positions.
OVERVIEW AFTER WORK
