Product Overview
The DN600 PN16 Nuclear Grade Rubber Compensator is a mission-critical flexible connector designed for the primary and secondary cooling loops of nuclear power plants. In environments containing high-chloride seawater or chemically treated cooling water, standard stainless steels (like 316L) often face pitting risks. This unit utilizes S2205 Duplex Stainless Steel for both the flanges and the entire Control Rod system, offering double the mechanical strength and significantly higher corrosion resistance (PREN >34).
The EPDM carcass is engineered for long-term aging resistance under radiation exposure and thermal cycling, ensuring the PN16 (1.6 MPa) pressure integrity is maintained throughout the reactor’s service intervals.
Key Features
- S2205 Duplex Steel Mastery: Both flanges and limit rods are fabricated from S2205, providing immunity to stress corrosion cracking and localized pitting in marine-side nuclear cooling.
- Nuclear-Grade EPDM Carcass: Formulated for low-leachable sulfur and high resistance to heat and ozone, ensuring 10-15 years of reliable service in secondary circuits.
- Matched Material Control Rods: Using S2205 for rods and gussets prevents galvanic corrosion between components, ensuring the “fail-safe” limit system remains structurally sound.
- High-Frequency Vibration Isolation: Specifically designed to decouple the massive tremors of nuclear circulating pumps from the sensitive downstream instrumentation.
- Full Material Traceability: Manufactured to meet stringent nuclear QA/QC standards, including NDT testing and EN10204 3.1 certification.
Applications
- Nuclear Seawater Intake Systems: Handling raw seawater for main condenser cooling.
- Auxiliary Cooling Water (ACW): Vibration isolation for critical safety-related pump sets.
- Nuclear Desalination Units: Flexible links for high-concentration brine discharge.
- Containment Spray Systems: Reliable expansion compensation for emergency cooling lines.
FAQ
Q: Why is S2205 Duplex Steel specified for both flanges and control rods in nuclear-grade rubber expansion joints?
A: In nuclear safety-related piping, material consistency is non-negotiable. The use of S2205 (UNS S31803) across the entire metallic assembly provides three vital engineering advantages:
- Superior Pitting Resistance (PREN): S2205 has a Pitting Resistance Equivalent Number (PREN) exceeding 34, which is far superior to SS316L (PREN ~24). This ensures the flange faces and limit rods do not suffer from localized corrosion in high-chloride seawater environments.
- Galvanic Compatibility: By using identical S2205 material for all metallic parts, we eliminate the risk of bimetallic (galvanic) corrosion. This is critical in nuclear cooling loops where any metallic degradation can lead to system-wide contamination or mechanical failure.
- Enhanced Safety Factor: S2205 possesses nearly double the yield strength of austenitic stainless steels. In a DN600 PN16 system, the thrust forces can be immense; S2205 control rods provide a significantly higher safety margin against deformation during unexpected pressure surges or seismic events.
DN600 PN16 Nuclear Grade Rubber Compensator - EPDM Bellows with S2205 Duplex Steel Flanges & Matching Control Rods
High-performance DN600 PN16 rubber expansion joint for nuclear facilities. Features EPDM bellows with S2205 duplex steel flanges and matching control rods. Superior corrosion resistance for seawater cooling. Buy nuclear-certified quality.
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