H4-DH-20B Maintenance Compliance with the conditions for ope Helical gearbox H4

Flender/Flender Gear Units/Helical gearbox H4

Impact the Shaft Alignment report issued earlier this year from ABS indicates that larger ships, driven by the latest generation of very high- powered diesel engines, are particularly susceptible to alignment problems on the bearings supporting the propulsion shafting as well as the main engine bear- ings. Hull girder deflection is one of the major reasons for the increased number of propulsion shafting and the main engine bearing failures and damages that are being reported. Hull deflec-tions are quite pronounced on large ves- sels where discrepancy between the flexibility of the hull and the shafting results in high sensitivity in the align- ment dependent upon the vessel' load- ing condition. Responding to industry need, ABS has investigated the hull deflections effect on the shaft alignment, conducting measurements on large number of ves- sels and using the information to devel- op state of the art alignment optimiza- tion software. ABS has also released Guidance Notes on Propulsion Shafting Alignment to provide detailed informa- tion on propulsion shafting alignment design procedure and to improve the design review process and survey. ABS research indicates that the align- ment related damages are mostly attrib- utable to inadequate analysis and design of the alignment, inadequate construc- tion practices and lack of proper guid- ance. Ship hull structures have become more flexible with scantling optimization and with an increase in ship' length. As the powering requirements increased with the increase in the ship' size, shafting LIFE PRESERVER Environment friendly Hydrox Bio 6 is biodegradable and has low toxicity to marine life. As sterntube lubricant, Hydrox Bio 6 helps to keep your fleet on the move, providing effective lubrication even when signifi