SADE’s speciality sectors

SADE’s speciality sectors

SADE’s business lines follow a policy of sustainable development and constant research into constructive and environmentally friendly solutions.

Innovative solutions, maximum effectiveness

Drawing on its historic technologies, SADE is developing multi-disciplinary know-how. And with its expertise in speciality techniques that enhance its customer service provision, it is expanding its activities into a broad range of different areas.

Confined spaces

Interventions in confined spaces (sewers in use, pumping stations, valve chambers, telecoms operators’ rooms, water tower tanks) involve particular hazards such as suffocation, poisoning, explosion or falling.

To prevent such hazards, there must be strict compliance with rules and instructions.
SADE is active in this respect and implements additional procedures to improve staff protection.

  • SADE has employed in-house trainers specialised in instructing how to manage these risks;
  • specific equipment has been designed, such as a specially-equipped truck to ensure the maximum level of personal safety (extractor fans, self-rescue masks, cones and traffic signs, tripod hoist, winch with descent control, multipurpose gas detectors).

Works in difficult-to-access locations

Due to their height or difficult access, some works require the implementation of the innovative techniques that SADE has acquired in order to deal with all types of intervention. Whether in the building or public works sectors, in the field of industrial cleaning or safety, in the events industry or for monitoring/assessment, the rope access technicians adapt themselves to every environment: urban, industrial or rural. SADE’s teams, based in Western France, are accustomed to safely carrying out emergency interventions both at home and abroad.

Network diagnosis

SADE is expert in using many network diagnosis techniques to meet the requirements of operators who wish to check for quality or pinpoint an exact location: techniques include video inspection, detection methods and the AQUADIAG system.  

Video inspection

Carrried out with a specially adapted radio-controlled camera, video inspection of a network enables:

  • preventive or corrective verification of its state and operational condition,  
  • testing for defects or damage (corrosion, fractures, cracks, seepage, collapse, etc)
  • feasibility studies prior to rehabilitation works (lining, etc)
  • monitoring after installing new networks or after rehabilitation.

Provided with tailor-made resources, SADE can carry out video inspections of pipes over 25mm.






Leak detection

The treatment of leaks is an essential part of improving a network’s efficiency. It also prevents any accidental ground pollution where wastewater networks are concerned. For drinking water networks, the treatment of leaks can avoid any waste of resources or unwarranted excess water usage by the consumer.

For detecting and pinpointing leaks, SADE employs a number of technologies, including:

  • acoustic correlation, 
  • noise logs, 
  • tracer gas, 
  • etc.

SADE is able to carry out systematic search operations over an entire network to map the leaking areas and also to locate a particular leak very accurately.


For drinking water networks, the AQUADIG diagnostic tool helps to ensure that the state of the pipes is not degrading the quality of the water supply.
The AQUADIG operates with a mobile unit and provides a real mapping of the network’s clogged zones. Many parameters are measured, such as pH, dissolved oxygen, turbidity, manganese, etc.  

Network detection

Network detection resolves several problem areas:

  • it analyses a worksite’s environment in order to avoid the risk of damage to utility networks
  • it locates with great accuracy those networks where the mappings are non-existent or incomplete.  

The technologies employed by SADE permit the detection of buried elements made of HDPE, cast iron, steel, copper, ceramic, asbestos cement, PVC, etc. They can then provide precise cartography showing the various networks detected.  

Prior to any digging operations on its urban worksites, SADE carries out network detection with data transfer to map and marking-out on the ground. This methodology brings SADE very good results in terms of damage to utilities.


In addition to its expertise in tank lining and working with water-resistant concrete, SADE also specialises in sealing structures with geo-synthetic products or with the hydroclick® process. These solutions apply to landfill sites, basins, reservoirs and any other structure where isolation from the natural environment is made necessary as a protective precaution or because of regulations. They apply to both new works and those to be rehabilitated.

● Geo-synthetic materials

Areas of application and works concerned

For wastewater, rainwater, sludge, leach, bathing water or process water, their isolation from the natural environment as part of adaptive management is essential.
With its integrated Design Office and certified expertise in applying its geo-synthetic materials, SADE is able to respond to all sealing problems on the works concerned: 

  • waste storage centre, 
  • drinking water storage reservoir,
  • rainwater storage basin, storm basin or fire-fighting reservoir,
  • industrial water retention basin, 
  • wastewater and sludge treatment basin (reed bed process),  
  • swimming pools.


● Applications and materials 

The use of geo-synthetic materials for sealing purposes is suitable in certain circumstances for the following applications:  

  • passive barrier reinforcement 
  • controlled active sealing with anti-punching protection 
  • watertight cover blanket, floating or non floating
  • geocomposite draining 
  • ground maintenance with geosynthetic membrane (revegetation on slopes or not)

The range of available materials is extensive:

  • High density polyethylene (HDPE)
  • Polyvinyl chloride (PVC) 
  • Low density polyethylene (LDPE) 
  • Ethylene propylene diene monomer (EPDM)
  • Bentonite complexes  
  • Bituminous membranes 

SADE possesses all the expertise and certifications required for the study of sealing solutions using geosynthetic products and their implementation. 

● Hydroclick®


The tanks are essential components of drinking water systems which should not question the quality of the water supplied.

Among their maintenance operations, rehabilitation is without doubt the heaviest.


If SADE has mastered, for a long time, in conventional rehabilitation process, it has recently developped an innovative expertise with Hydroclick® process.

Hydroclick® allows in 4 simple steps to put, within the works, a second HDPE skin , whatever their configuration and without any preparation:

- Fixing of the profiles on the stucture to rehabilitate

- On site cutting and customizing HDPE plates of 4 mm thickness

- Clicking on the profile plates

- Welding the strips together for a perfect seal.

Fields of application 

- All architectural forms (walls, arches, floors ...) simple or complex

- All material holders

- Tanks, water towers, swimming pools ...

Cantilevered pipe laying

Cantilevered pipe laying assists the overcoming of certain natural obstacles (rivers, valleys, etc) by overhead crossings. This technology consists of following the line of the structures on the network layout: the ducts are then anchored under or alongside the structure (bridge, viaduct, etc.) in compliance with the authorisations and technical specifications of the structures’ owners or operators. Implementing this technology often requires the employment of personnel specialising in difficult-to-access works: SADE’s teams are specially trained for this type of intervention.

River crossings

Networks to be installed sometimes find that their route is barred by natural obstacles whose by-passing would have a serious impact on the project: pipeline length increase, additional equipment to be supplied, prolongation of delivery deadline. When an overhead crossing is not possible, several solutions can be considered: the implementation of trenchless technologies (pipe jacking with microtunnel boring machine or directional drilling) or by laying the pipes under water in a trench dug in the river bed. SADE’s teams are able to carry out these unusual works under very safe conditions.

Sea outfall and intake

SADE puts specific installations in place to limit environmental damage and protect marine life.

It is particularly specialised in installing outfall sewers in the sea.

For example, after sheet-piling with a vibratory driver, SADE constructs an apron then positions prefabricated culverts fitted at the end with an outlet valve to avoid the entry of sea water into the outfall sewer. 

The works reduces the environmental impact by seaward dispersal of the discharged water.

Heat recovery from wastewater networks: Energido

Wastewater, whether from dwellings or industrial sites, passes through treatment plants at a temperature of around 20°C. 

SADE carries out the necessary works (installation of heat exchanger, heat pumps, etc.) in close proximity to buildings to recover the heat present in wastewater coming from sewage treatment plants or directly in an effluent collection or transport network and makes it suitable for heating systems.

With this process, SADE is again involved in the field of sustainable development by facilitating the use of heat from a renewable energy source.

SADE - 23-25 av. du Docteur Lannelongue - CS 51450 - 75685 Paris Cedex 14