The expanded system in the large bore section of the tailshaft.


new system. Tis data is then analysed to determine the implications on the life of the tailshaſt and confirm that it is fit for purpose, or identify the need for repair or replacement. “Previous attempts to address the issue had


Extensive trials and testing during a


three-year development programme have demonstrated that defects can be accurately located, sized and categorised using this


not been successful, due to the significant challenges involved either in using external NDT inspection techniques or in deploying equipment through the centre of the tailshaſt,” Babcock Integrated Technology Project Manager Steve Cann explained. “Te solution our team has developed is right on the cusp of the technologically possible, in order to meet the considerable demands successfully.” Commenting on the use of the new


technique on HMS Trenchant, Babcock Submarine Operations Director Devonport,


Gavin Leckie, said: “Te technique allows the condition of a tailshaſt to be assessed in about a month. When you consider that removing and replacing a tailshaft normally takes in the order of 18 weeks and ‘burns’ over 9000 man hours, the cost and time benefit to this RAMP and future programmes is enormous.” Te new tailshaſt inspection technique


is now fully operational following full qualification last year. Ministry of Defence Maritime Equipment Services Head of Shaſting Jon Nicholson said: “We now have a robust, cost-effective alternative for the management of tailshaſt safety, with the potential to save considerable time and money during docking periods. Moreover, the ability to inspect and revalidate tailshaſts in-situ now means that inspections can be carried out on a three-yearly basis, at both Devonport and Faslane, with potential to provide added safety and submarine availability benefits.” WT


Warship Technology July/August 2010


23


Feature 3


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