OPTIMIZATION AND TESTING OF STERN TUBE SEALING SYSTEMS

In order to extend the life cycle and increase the reliability of a sealing system, friction coefficient was selected as the goal of optimisation. Because thermal load and wear are the governing factors in the life cycle of a sealing system, minimisation of friction coefficient can reduce the wear and temperature of the contact surface between the seal ring and the sleeve. In addition, the sealing system is also affected by hydraulic pressure. In order to reduce the effect of the latter on seal performance, a design method for geometrical and constructional parameters of the seal ring and the support ring was developed. Test results for a sealing ring 355mm in diameter designed by the method described here are given. Several parameters were measured, including static deformation of sealing rings, contact width between the seal ring lip and the sleeve, friction moment, temperature of the contact surface between the seal ring and the sleeve, and the temperature, pressure and leakage estimation of the sealing medium.