Spunalloys supports many of the world’s navies with the provision of propulsion shaft liners/sleeves on both surface and subsurface platforms.
Naval tail shaft liners (sleeves) are critical components that protect the propeller shaft from unnecessary wear corrosion. Aft liners (sleeves) are typically long, heavy items requiring a large melt capacity and associated machining capabilities. They are regularly supplied finish machined, requiring all of Spunalloys’ experience, skill and infrastructure.
Our large melting capacity and extended horizontal casting platform enables naval shaft liners to be supplied up to 5000mm in length in various corrosion resistant alloys, such as copper nickel, gunmetal, tin and phosphor bronze, nickel aluminium bronze, monel and Inconel. Spunalloys’ in-house machining capabilities allow ‘liners’ to be supplied either proof or finish machined.
Finish machining generally involves the bore [including water injection scrolls] with a proofed outside diameter to allow for ‘sixing’ when fitted to the ship shaft. Spunalloys developed unique and proprietorial solutions to meet the stringent acceptance criteria demanded for naval shaft liners. Spunalloys carries approvals for many major 1st and 2nd tier organisations, including UK MOD Approval to manufacture DEF STAN 02-830 (LG4) shaft liners, inspected in accordance with DEF STAN 02-304 part 1. Our experience and manufacturing capabilities allow us to support many of the world’s naval forces, including USA/NAVSEA.