Nuclear installations require the highest standards of safety, reliability and qualification. Made in France and capable of being individually tested, Dilatoflex® elastomer expansion joints guarantee full traceability.
Expansion joints provide effective vibration damping, absorb thermal expansion and allow mechanical movement.
This helps protect piping systems and associated equipment from mechanical stress and premature failure.
The proven design, combined with strict quality control procedures, delivers reliable performance and a long service life under demanding operating conditions.
Dilatoflex® rubber expansion joints are used in the main cooling lines of nuclear power plants worldwide, including turbine and condenser systems.
Manufactured according to a strict quality plan and testing procedures, with the possibility of inspection by external auditors.
Proven design and carefully selected high-quality raw materials contribute to reliable performance and extended service life.
Analysis of technical specifications, in-depth knowledge of local standards and regulations, design verification, testing and comprehensive documentation.
Specially designed for condenser and turbine systems, Dilatoflex® expansion joints are available in lengths exceeding 40 meters. Our teams provide on-site assembly and offer regular maintenance inspections, ensuring reliable performance under the most demanding operating conditions.
This historical expertise and this constant level of requirement are concretized by a major historical recognition: our EDF UTO qualification, both for the supply of equipment and for the associated services. What this qualification guarantees to our partners:
By renewing its confidence in the Dilatoflex® range, the nuclear sector confirms that safety and sustainable performance remain our shared priority.
Continuing our ongoing quest for excellence and our absolute rigor in terms of safety for critical installations, we are proud to announce the launch of our ISO 19443 certification process.
More than just a certification, it represents a strategic lever that allows us to:
Strengthen our safety culture at all levels of the company.
Guarantee rigorous control of the supply chain and strict management of the risks of counterfeiting, fraud or anomaly.
Consolidate the trust of our customers and partners in the most demanding markets.
Our expertise in critical infrastructure is already well-established. By aligning our processes with ISO 19443 standards, we are taking a significant step forward. This approach reinforces our commitment to continuous improvement and solidifies our position as a trusted partner for large-scale projects.
Dilatoflex® provides you with tailor-made support throughout the life cycle of your projects.
See allCustomers and partners who trust us around the world.
Need technical assistance?
In a nuclear power plant, the service life of expansion joints depends entirely on their material and their location (primary, secondary, or auxiliary cooling circuits). They are systematically replaced preventively during outages. Under operating conditions conforming to nominal specifications, the estimated service life of special BPO-type joints (particularly turbine/condenser connections) is 15 to 20 years. Preventive replacement is scheduled during major overhauls or outages.
Yes, according to the project engineering specifications, these components fall within the framework of the rules for the design and production of mechanical equipment for nuclear islands (RCC-M), in particular for the traceability of materials (metal flanges in carbon steel or 304L/316L stainless steel) and the calculation of earthquake resistance.
Dilatoflex® has a specific “Nuclear” certification that is continuously audited. The products meet the quality assurance requirements required by major clients (EDF Qualification). ISO19443 certification is in preparation.
Expansion joints and long-length joints (e.g. types BPO / Dog-Bone, BC1, or type U) are mainly installed on:
Yes, for safety-classified circuits (for example, the emergency raw water circuit). The expansion joints must pass seismic qualification tests (shaking table tests or finite element calculations) to prove that they maintain their structural integrity and watertightness during and after a reference earthquake.
