Static Investigation of Sterntube Oil Seal Ring Deformation Under the Influence of Pressure

Horinouchi Mitsuo, Yanome Senzou

doi:10.5988/jime1966.3.44

Out of the troubles on sterntube oil seal devices, the most critical problem is the cracks on the seal ring found in many seal devices. The phenomenon of these cracks can be divided into two categories, i. e. (1) numerous hair cracks on lip face, and (2) circumferential long cracks on bend parts of seal ring. Among the various conceivable causes of these cracks, it is considered that, particularly on large ships, one of the most important factor is the large deformation and stress concentration of the seal rings under the high pressure. At balast condition, the seal rings are subject to the large differential pressure created by the oil head tank and draught, and this pressure generally exceed 0.5 kg/cm²G in case of 50, 000 DWT and larger ships.<BR>This paper deals with the results of hydrostatic test conducted on the existing 670 type seal ring, in order to investigate the actual behavior of seal rings under the pressure.<BR>The results show that, the mode of deformation of bellow part, when they are kept free of restriction, is considerably different from when they are restricted for axial movement by support ring. And the bellow part is bended sharply at the fastening edge of casing and support rings. The seal lip is pressed down on to the liner and contacts in full width of lip face at the pressure of 1 kg/cm²G. When the back pressure is given, the seal ring leaks at the pressure of 1.1 mAq. High pressure test shows that, mechanical strength of a new seal ring of the existing type is sufficient and it can withstand comparably high pressure without burst.

Static Investigation of Sterntube Oil Seal Ring Deformation Under the Influence of Pressure

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