Archives des Actuality - Page 2 of 2

Revin Hydroelectric Power Plant, France

Rehabilitation of Group G4 (Francis type)

In mid-2023, we worked on the G4 Group (Francis type) of the Revin Hydroelectric Power Plant in France for our customer EDF.

GOAL
TOLERANCES REQUESTED
ACHIEVEMENT

Recovery of different turbine elements
Return of the scope Ø2820 H7 on the wear part and change to diameter Ø2816 H7 after reloading
Return of the scope Ø2875 H7 on the wear part side and change to diameter Ø2872 H7 after reloading
Surface straightening perpendicular to span Ø2875 (1 to 3mm)
Counter-drilling and tapping of 12 M16 holes for fixing the wear part

Cylindricity of diameters Ø2816 and Ø2872: 0.4 mm
Coaxiality / Concentricity of diameters Ø2816 and Ø2872: 0.4 mm
Perpendicularity of upright surface to diameter: 0.2 mm
Straightened surface flatness: 0.3 mm
Depth of drilling / tapping: 0.5 mm
Surface condition: Ra 1.6 minimum

Our intervention took place in several stages:

Step 1: Analysis of the subject in our Design Office (feasibility, 3D modeling of the turbine and the wear part, implementation of our machines in the 3D work environment for the different operations).
Step 2: Carrying out pre-work checks (Laser Tracker) by an external company.
Step 3: Installation of our machines on site and machining.
Step 4: Realization of after-work checks (Laser Tracker) by an external company.

3D MODELLING

3D modeling of the different elements according to the original plans provided by the customer.

MACHINE SETUP & MACHINING

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Apr 18 2023

Rehabilitation of a group (Francis type) 𝘊𝘖𝘖

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Coo-Trois-Ponts Hydroelectric Power Station, Belgium

Rehabilitation of a Group (Francis type)

During the year 2023, we intervened on one of the groups (Francis type) of the Hydroelectric Plant of Coo-Trois-Ponts, in Belgium. These operations were carried out as part of a group rehabilitation project by our customer VOITH HYDRO.

GOAL
ACHIEVEMENT

Machining of the following at the spiral sheet:
Ø2286 (+1; +2) at 219 mm height (material removal: 12.7 mm)
Ø2365 H7 on a height of 30 mm (material removal: 36.3 mm)
Ø2444 H7 on a height of 110 mm (material removal: 2.8 mm)
Ø2485 H7 on a height of 141 mm (material removal: 10.5 mm)
Surfacing from diameter Ø4572 to diameter Ø4660 and creating a groove Ø4603 after reloading
Surfacing flange cylindrical door and creation of throat
Surfacing frame holder vacuum cleaner

Our intervention took place in several stages:

Step 1: Analysis of the subject in our Design Office (feasibility, 3D modeling of the spiral cover, the cylindrical door and the vacuum cleaner door frame, implementation of our machines in the 3D work environment for the different operations).
Step 2: Carrying out pre-work checks (Laser Tracker) by an external company.
Step 3: Installation of our machines on site and machining.
Step 4: Realization of after-work checks (Laser Tracker) by an external company.

3D MODELLING

The valve environment is 3D modeled in accordance with the customer’s original plans

MACHINE SETUP & MACHINING

OVERVIEW AFTER WORK

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Apr 11 2023

Turbine machining (Kaplan type) 𝘖𝘛𝘛𝘔𝘈𝘙𝘚𝘏𝘌𝘐𝘔

PrevPreviewRehabilitation of groups (Francis type) 𝘏𝘌𝘙𝘔𝘐𝘓𝘓𝘖𝘕

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Ottmarsheim Hydroelectric Power Plant, France

Recovery of different turbine elements

During 2023, we worked on the G1 Group (Kaplan type) of the Ottmarsheim Hydroelectric Power Station, in France, for our customer VOITH HYDRO.

GOAL
TOLERANCES REQUESTED
ACHIEVEMENT

Recovery of different turbine elements Flange and Ø6050 H7 of the foundation ring Surfacing of the upper face of the lower ring (Ø6900 to Ø8700) then machining of the face and diameter Ø6900 Undercoating of headgear (Ø6900 to Ø8700) Addition of modifications on the 48 sealing pots (drilling-tapping, facing)

Horizontality and flatness of machined planes: 0.02 mm/m Bores: H7 Floor depth: 0.1 mm
Surface Condition: Ra 6.3

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 machines in the 3D work environment for the different operations).
Step 2: Carrying out pre-work checks (Laser Tracker) by an external company.
Step 3: Installation of our machines on site and machining.
Step 4: Realization of after-work checks (Laser Tracker) by an external company.

3D MODELLING

The planing and boring operations to be carried out require two positions for our first machine (low position and high position) as well as several configurations.

The additional modifications for sealing the 48 guide pots require different machines and assemblies (boring machine for the screeds and magnetic drill for the tapping-holes).

PRE-WORK & MACHINE SETUP

Our machine was installed in the turbine and adjusted with the help of the Laser Tracker

OVERVIEW AFTER WORK

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Sep 18 2022

Rehabilitation of groups (Francis type) 𝘏𝘌𝘙𝘔𝘐𝘓𝘓𝘖𝘕

PrevPreviewTurbine Francis 𝘎𝘌𝘕𝘐𝘚𝘚𝘐𝘈𝘛

NextTurbine machining (Kaplan type) 𝘖𝘛𝘛𝘔𝘈𝘙𝘚𝘏𝘌𝘐𝘔Next

Hermillon Hydroelectric Power Plant, France

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.

GOAL
TOLERANCES REQUESTED
ACHIEVEMENT

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

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NextTurbine machining (Kaplan type) 𝘖𝘛𝘛𝘔𝘈𝘙𝘚𝘏𝘌𝘐𝘔Next

Sep 18 2019

Turbine Francis 𝘎𝘌𝘕𝘐𝘚𝘚𝘐𝘈𝘛

PrevPreviewTurbine Francis 𝘎𝘜𝘙𝘐 𝘝𝘌𝘕𝘌𝘡𝘜𝘌𝘓𝘈

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GENISSIAT (France)

Installing and modifying stainless steel shielding

During a turbine maintenance, when the Francis wheel was dismantled by ALSTOM HYDRO, the customer noticed an extremely large cavitation with in some places a total piercing of the shield.

To ensure the optimum restart of the installation within the planned time frame, ALSTOM HYDRO contacted TACQUET INDUSTRIES in order to carry out a feasibility study and complete the work within the given time frame.

Service provided in emergency

Expertise and feasibility study
Definition of means
Assembly of a specific machine
Machining of the cavity area
Diameter ø 4m075, Height: 200
Machining thickness 8 mm
Tolerance 0.15 mm

In collaboration with ALSTOM HYDRO, TACQUET INDUSTRIES installed and remanufactured a stainless steel shield with an accuracy of 0.1.

PrevPreviewTurbine Francis 𝘎𝘜𝘙𝘐 𝘝𝘌𝘕𝘌𝘡𝘜𝘌𝘓𝘈

NextRehabilitation of groups (Francis type) 𝘏𝘌𝘙𝘔𝘐𝘓𝘓𝘖𝘕Next

Sep 18 2015

Turbine Francis 𝘎𝘜𝘙𝘐 𝘝𝘌𝘕𝘌𝘡𝘜𝘌𝘓𝘈

PrevPreviewTurbine Pelton 𝘓’𝘈𝘙𝘎𝘌𝘕𝘛𝘐𝘌𝘙𝘌

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GURI Vénézuela

MACHINING TURBINES Type Francis

The GURI dam, located in central Venezuela near PUERTA ORDAZ is the third largest dam in the world and has 16 turbines. The Venezuelan government has decided to rehabilitate all the site’s installations in two phases, the first of which was entrusted to ALSTOM HYDRO. This rehabilitation concerns 8 groups out of a total of 16. Previously, the maintenance operations carried out at the GURI site had required the dismantling of damaged parts, their transport around the world to multiple workshops, their return to Venezuela and finally, the reassembly of the parts on site. All these operations involved very long response times.

In order to increase the efficiency of intervention, ALSTOM HYDRO has studied an innovative approach by proposing to carry out all services directly on the GURI site with portable machining equipment.

ALSTOM HYDRO, after study, entrusted TACQUET INDUSTRIE with the design and construction of two portable towers capable of machining up to 8.5 metres in diameter.

Summary of the intervention by TACQUET INDUSTRIE.

Design and construction of two portable towers with a diameter of 8.5 meters,
Development of special equipment,
Training of personnel working on the GURI site,
Participation in machining operations,
Machining of fixed parts in the well,
Machining of disassembled parts.

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Sep 18 2007

Turbine Pelton 𝘓’𝘈𝘙𝘎𝘌𝘕𝘛𝘐𝘌𝘙𝘌

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NextTurbine Francis 𝘎𝘜𝘙𝘐 𝘝𝘌𝘕𝘌𝘡𝘜𝘌𝘓𝘈Next

L'ARGENTIERE France

PELTON TURBINE MACHINING

As part of its rehabilitation programme for the French Hydro Power Plants, EDF has defined a number of priority sites including the LES CLAUX Dam.

After studying the EDF specifications, TACQUET INDUSTRIES has developed a procedure for the realization of on-site machining in compliance with the defined standards. This procedure was adopted and approved by EDF.

Summary of the intervention by TACQUET INDUSTRIE.

Two diameter concentric bore 1382 mm,
Surfacing of the two parallel faces from diameter 1382 to diameter 1560,
Tolerance: 5/100 th.

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NextTurbine Francis 𝘎𝘜𝘙𝘐 𝘝𝘌𝘕𝘌𝘡𝘜𝘌𝘓𝘈Next

Sep 18 2006

Rehabilitation of hydraulic plant 𝘒𝘈𝘜𝘕𝘈𝘚 𝘓𝘐𝘛𝘏𝘜𝘈𝘕𝘐𝘈

NextTurbine Pelton 𝘓’𝘈𝘙𝘎𝘌𝘕𝘛𝘐𝘌𝘙𝘌Next

KAUNAS Lithuania

MACHINING TURBINES Type Kaplan

At the request of the Lithuanian Government, ALSTOM HYDRO carried out a rehabilitation project on the KAUNAS Hydroelectric Plant with the objective of increasing the performance of the four turbines.

For this purpose, ALSTOM HYDRO has selected TACQUET INDUSTRIES among the three companies in the world able to perform on-site machining operations. These operations were usually carried out in a heavy workshop.

TACQUET INDUSTRIES carried out the feasibility study, designed a specific machine unique in the world to execute various works on hydroelectric sites and achieved all the machining operations on the turbines.