Arc supplies tubular components for submarines
Arc Energy Resources has delivered 24 tubular components for the main circulating seawater system used to cool the nuclear reactors on two Astute-class submarines.
Eight 2m long centre tubes and sixteen 1.1m long end sections - all 430mm in diameter - are clad throughout the bore and in the complex sealing areas at each end.
Arc Energy recommended the use of ASTM A694 F65 forged steel as the base material and Nickel Copper alloy 400 (AWS A5.14 ERNiCU-7), noted for its resistance in chloride environments such as seawater, was selected as the welding consumable.
An overlay thickness of 5mm was applied to ensure that the surface of the deposit would meet the chemical requirements of the alloy.
Included in the 'source and supply' contract was the purchase of the carbon steel and the pre-machining of the components to ensure that sufficient material was deposited to achieve the tight tolerance specified for the final dimensions.
After cladding, final machining and NDT inspection, Arc's fabrication division produced and welded in place the location bosses, which enable the three sections of each assembly to be fitted together.
They then arranged for the external surfaces of the components to be coated with an aluminium spray.
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