9 rue léon Blum Palaiseau
Palaiseau,  Essonne  91120

  • Booth: 2115

To respond to all our client needs, Cementys engineers have developed and implemented a line of durable sensors, suited for long-term monitoring of critical assets in Oil & Gas and LNG (optical fiber and vibrating wire technologies with 20 and 70 years feedback). To fully analyze the data gathered by sensors, we developed innovative survey methods, and created monitoring and maintenance software systems.

 Press Releases

  • Late 2018, Cementys engineering team finalized its first deepwater riser real-time monitoring project.

    The instrumentation operation took place in the Gulf of Mexico, on an existing Tendon Leg Platform (TLP), exposed to frequent Loop Current events.

    Vortex Induced Vibrations (VIV) of a riser in severe loop currents can decrease the riser fatigue life and thus may have significant cost impacts.

    VIV suppression devices are essential to minimize those events, eventhough VIV behavior presents one of the biggest simulation uncertainties facing the riser engineers.

    This shows that full scale monitoring is essential to improve our understanding of VIV response of risers equipped with VIV suppression devices.

    Cementys designed and set up a system to measure the strain variation of Top Tension Risers (TTRs), focusing on one of the regions where fatigue damage is expected to be greatest : the top of the riser, around 20 meters above sea level. The objective is to compare efficiency of the different currently installed VIV suppression devices and estimate the induced fatigue damage during a single Loop Current event.

    The system is based on the ExtensoVib vibrating wire strain sensors, allowing for accurate strain measurements, with a resolution below 0.1 microstrain.

    Each riser is equipped with six ExtensoVib extensometers with a 60° separation: 3 sensors for one monitoring system, 3 others for redundancy.

    Sensors are connected to two dynamic data loggers, making a high frequency measurement (20Hz) for high frequency riser oscillations.

    ExtensoVib risers are bonded directly on the riser metal surface, without the coating, to measure directly the surface strain, without drift or recalibration for a period of several years.

    Cementys has a remote access to check the incoming data. The real-time axial loads and bending moments are analyzed in correlation with loop current conditions to follow the fatigue damage accumulation.

    ExtensoVib sensors represent a cost-effective solution for riser monitoring projects.

  • Anticipating future energy challenges, Argentina asserts its will to increase its atomic energy industry. Argentina’s government has entrusted CNEA (Comisión Nacional de Energía Atómica) with the development of a new type of nuclear reactor, from low to medium electrical capacity, completely engineered and designed in Argentina.

    The project, called CAREM 25, began in early 2014 at the Atucha nuclear site in the province of Buenos Aires.


    CAREM 25 project

    This new generation reactor, of reduced dimensions, will produce 25 MW which corresponds to the power supply of a 100 000 inhabitants city.

    Cementys provides technical expertise to CNEA for the design and the implementation of a structural instrumentation and monitoring meeting the project’s requirements.

    For this CAREM 25, Cementys favored to set-up a “long-term” instrumentation based on robust and viable Vibrating Wire sensors. These technology based sensors have been installed on French and worldwide nuclear power plants for more than 40 years and their reliability is no longer to be demonstrated.


    MicroVib® Sensors

    In addition to so-called “traditional” sensors in the nuclear industry, CNEA has relied on Cementys’ fiber optic measurement technical expertise and know-how, to integrate optical fiber cable into several parts of the reactor’s slab and concrete walls.

    “For such an ambitious project that is the CAREM 25, we desired to ensure a traditional structural monitoring (Vibrating Wire sensors), and improve it with an advanced technology that is optical fiber distributed measurement in order to better understand the behavior of the structure”, commented Vincent LAMOUR, technical director and civil engineering expert at Cementys.

    Distributed measurement with optical fiber gives added-value data since temperature and strain perceived by the fiber optic cable is collected each meter over its entire length.

    Slab’s instrumentation was installed during summer 2016, and allowed to verify the good behavior of the concrete during its pouring in October 2016. Optical fiber measurements emphasize the same temperatures and strains as recorded by the Vibrating Wire sensors, and moreover, provide many additional measuring data.

    A dedicated web interface allows the CNEA Civil Engineering and Instrumentation engineers to visualize real time data from the various installed sensors.

    Cementys’ engineering teams will continue to contribute to the coming phases of the project with their expertise, until the site’s commissioning in the first half of 2019.

  • Pipeline leak detection is so important… Even though pipelines are still the safest way to transport oil and gas products, spills and leaks may occur. These incidents can have an important environmental impact, incur cleaning costs, and deteriorate the company’s image.

    Several technologies have been developed to monitor the pipelines to detect or prevent leaks (ultrasounds, flow monitoring, smart pigs…). Optical fiber recently brought a revolution to the sector: we can now have a distributed measurement all along the line using telecommunication fibers, giving us every foot the temperature, strain and vibrations of the pipe.

    Most optical leak detection systems today use Distributed Temperature Sensor (DTS) monitoring. When the product is at a different temperature than the exterior environment, a passive monitoring system will be able to rapidly detect leaks by looking for hot or cold spots along the line. This type of measurement has an extremely low false alarm level, especially if there is a big difference of temperature (LNG, heated oil, pressured gas with Joule Thomson effect…).

    But when the product is at the same temperature than the exterior environment, a passive DTS monitoring will not work. This is why Cementys developed an Active DTS monitoring system: in this case, we use a metallic cable to heat the line, in order to analyze both the temperature and the temperature variation. This real time analysis gives out the thermal capacity of the environment, directly linked to the presence of oil.

    For long lines, Cementys developed the Transient Monitoring System. To use an active DTS system, one will need power to heat the line (around 1W per meter). We can see that this solution is hard to implement for lines longer than a mile. Our Transient Monitoring System analyzes the temperature variations due to daily and seasonal changes. After a learning period, the system is capable to detect a change in behavior therefore a leak.

    Thanks to those technologies, Cementys can help you to monitor all of your lines.


  • Leak detection system by optical fiber sensors.
    Optical Fiber sensor Combine with Raman, Brillouin or Rayleigh measurements technologies is a monitoring system. With a Long Range, qualified cryogenic(-180°C) and high temperature (600°C), we could use fiber to detect leaks, stress/Temperature/Mouvement....

  • SensoLuxTMA® is an optical fiber sensor designed to continuously measure temperature, strain, acoustics or vibration over a range of more than 20miles, with one foot of precision. Built with 4 standard telecom fibers (2 ITU-G621 and 2 ITU-G652), it takes benefit of their low loss properties and intrinsic sensitivity to temperature (Raman Scattering), strain (Brillouin Scattering) and acoustics/vibrations (Rayleigh Scattering). As any optical fiber sensor, SensoLuxTMA® is totally immune against lightening or other electro-magnetic perturbation.

    This sensor is very suitable for monitoring or detection on large structures with restricted access:

    • Buried pipelines: leak detection, stress monitoring, pig tracking
    • LNG tanks: leak detection
    • Mooring lines: distributed stress and position
    • Tunnels: Fire detection, convergence measurement.
    • Dams and Dikes: Leak or landslide detection,
    • Water and oil pipes: temperature control, leak or crack detection,
    • Bridges, nuclear power plants: Structural Health Monitoring, Ageing control of
      pre-stressed structures.
  • Strain Gauges
    The mountable strain sensor Strainlux makes use of the internal strain sensitivity of the FBG. The FBG is fixed inside a ruggedised stainless steel housing between two anchoring points....

  • The StrainLux sensor is designed to locally measure the total deformations experienced by a stressed structural element. The measurement is based on Bragg grating optical fiber technology. The information transmission properties of the optical fiber enable remote StrainLux  sensors to operate several kilometers from the acquisition unit. In all electromagnetic environments (lightning, high-voltage cable, electromagnetic noise), they also have the advantage of being able to be multiplexed along the same fiber: 20 sensors (16 recommended) can be typically placed along the same path. a single cable of very small diameter (3 mm).

    This sensor is particularly aimed at durable structures and sensitive industrial installations in steel:

    • Carpentry and gantry cranes

    •                     Nuclear center

    • Shipbuilding

    • Bridges and viaducts made of metal

    • Pressurized tanks and caissons

    • Pipes, pipes and forced water pipes

    • Offshore Platforms

  • Load Cells
    Load cells use the property that some bodies have to be electrically polarized under the action of a mechanical stress and reciprocally to deform when an electric field is applied to them....

  • TassoVib settlement gage consists of 3 main parts reservoir, tube that liquid fills and VW pressure sensor kit. The reservoir is positioned at a stable location, the other at different locations. The transducer converts liquid pressure acting on the diaphragm into the frequency signal.

    The settlement gage is connected via a tube filled with liquid to a reservoir. As the transducer settles with the surrounding ground, the transducer senses the pressure of the fluid within the tube and measures the difference in the elevation between the reservoir and the settlement gage. The settlement is calculated by converting the change in pressure to millimeters or liquid head.

    The settlement gage utilizes special steels to minimize thermal zero shift. The VW settlement gage is equipped with a lightning protection device for protecting the pressure transducer from electrical shock and a temperature device for compensating for temperature variations.