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08223 Investigation and Repair of Corrosion of Hull Forgings in Collins Class Submarines

Picture for 08223 Investigation and Repair of Corrosion of Hull Forgings in Collins Class Submarines
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Product Number: 51300-08223-SG
ISBN: 08223 2008 CP
Author: P. Vince and G. Sloan
Publication Date: 2008
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The pressure hull of a submarine has many penetrations to allow for the ingress and egress of sea water, fuel, lube oil and air. For the Collins Class submarines, specifically designed steel hull forgings are installed in the hull to provide reinforcement for these penetrations. This paper presents a case study of corrosion and repair of the hull forgings. The original nickel plated design of the hull forgings suffered corrosion due to sea water attack and subsequent dissimilar metal coupling. The corrosion resulted in metal loss which introduced a risk of serious impact on the function of the forgings. Short-term repair of the forgings was implemented by way of localized weld repair and selective brush plating of nickel. Simultaneously, investigations into long term solutions were carried out.
The pressure hull of a submarine has many penetrations to allow for the ingress and egress of sea water, fuel, lube oil and air. For the Collins Class submarines, specifically designed steel hull forgings are installed in the hull to provide reinforcement for these penetrations. This paper presents a case study of corrosion and repair of the hull forgings. The original nickel plated design of the hull forgings suffered corrosion due to sea water attack and subsequent dissimilar metal coupling. The corrosion resulted in metal loss which introduced a risk of serious impact on the function of the forgings. Short-term repair of the forgings was implemented by way of localized weld repair and selective brush plating of nickel. Simultaneously, investigations into long term solutions were carried out.
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