变频器服役橡胶软管老化状态评估OA

The double-layer rubber hose used in the power unit of a nuclear pump frequency converter in a nuclear power plant has been in service for nine years under demineralized water environment at 30～47 ℃.An assessment was required to determine its suitability for continued service over an additional three-year period.In this paper,the thickness,Fourier infrared spectrum,Shore hardness and tensile properties of a in-service hose,spare hose and a new hose were tested.The results showed that the service hoses still had some performance margin,although their mechanical properties were gradually declining.The 120 hours accelerated aging test of the service hose was carried out at 175 ℃ to simulate the condition that the hose continues to service for 3 years at 47℃.The tensile elongation at break of the aged inner hose and the outer hose were both greater than 200％,and the tensile strength were both greater than 5.5 MPa,which indicated that the tensile properties of the silicone hose in service after accelerated aging still met the use requirements and had the performance margin to continue service for 3 years.