Hydraulic and earth engineering – Marine structure or fabrication thereof – Structure protection
Patent
1987-02-09
1989-05-16
Corbin, David H.
Hydraulic and earth engineering
Marine structure or fabrication thereof
Structure protection
405195, E02B 1700
Patent
active
048305405
ABSTRACT:
A method for constructing inspectable welded joints which are resistant to marine biofouling, and the welded joints formed thereby, are disclosed. The method comprises bonding a first coating of a substantially dielectric material to the welded joint and bonding a second coating of a marine growth-inhibiting material to the first coating. The first coating preferably is less ductile than the underlying welded joint. The second coating is electrically insulated from the underlying welded joint by the first coating and provides a source of a biocide which prevents the accumulation of marine biofouling encrustations. Fatigue cracks occurring in the welded joint propagate through the coatings and are readily visible on the outer surface of the second coating. Further, fatigue cracks in the welding joint may be detectable through the use of nondestructive testing techniques prior to the time when they are visible on the outer surface.
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Bell Keith A.
Corbin David H.
Exxon Production Research Company
Ricci John A.
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