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Method and Apparatus for Corrosion Allowance Mitigation

a technology of corrosion allowance and corrosion allowance, applied in the design of tanks, vessels, hull parts, etc., can solve the problems of increasing weight, stiffening, and structural elements such that they are no longer industry standard items, and achieve the effect of reducing the amount of structural materials

Inactive Publication Date: 2013-07-18
SEAHORSE EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a way to reduce the amount of steel required when designing offshore structures such as Tension Leg Platforms, semi-submersibles, drill ships, jack-up structures, crane barges, barges, and the like. This method can save money and reduce the weight of the structures.

Problems solved by technology

The material increase results in a weight increase and may lead to the dimensions of structural elements, e.g. stiffeners, being such that they are no longer industry standard (“off-the-shelf”) items.

Method used

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  • Method and Apparatus for Corrosion Allowance Mitigation
  • Method and Apparatus for Corrosion Allowance Mitigation
  • Method and Apparatus for Corrosion Allowance Mitigation

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Embodiment Construction

[0018]The invention may best be understood by reference to the exemplary embodiment(s) illustrated in the drawing figures.

[0019]An important advantage of the method of the invention is that hull structural weight can be reduced by mounting the stiffeners, bulkheads, girders, etc. on the dry side of the structural element as opposed to the wet side, where they are exposed to ballast water—typically, chemically-treated seawater. The design is such that the “dry” corrosion allowance can be applied to a large percentage of the steel comprising the ballast tank scantlings, rather than the much greater “wet” corrosion allowance.

[0020]Another advantage of the method is that the stiffeners and girders and many gussets may be absent from the ballast tank internal surfaces, where typically sophisticated and expensive corrosion resistant coatings must be applied. The method thus not only reduces the total surface area to be painted, but sharp corners, rat-holes, cutouts and other structural di...

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PUM

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Abstract

A design and construction method reduces the amount of structural material (e.g., steel) required when applying the corrosion allowance to the design of floating offshore structures. The (hull) structural elements involved are typically flat or curved panels where at least one side is wet, e.g.; inside a ballast tank or exposed to seawater. The method minimizes the area to which the largest corrosion allowance is applied. One principle of this method is to have a maximum of one wet side for each hull watertight plating element. The stiffening of this hull structural element is applied to the dry side, i.e., the side that requires the lesser amount of corrosion allowance. Practice of the method typically results in a hull design wherein ballast tanks do not share a common structural element with either another ballast tank or the hull external shell.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 587,024, filed on Jan. 16, 2012.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0002]Not ApplicableBACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]This invention relates to the design of tanks, vessels, hulls and the like. More particularly, it relates to braced steel structures having both wet and dry surfaces.[0005]2. Description of the Related Art Including Information Disclosed Under 37 CFR 1.97 and 1.98[0006]The corrosion allowance is the diminution of material (usually steel) allowable due to corrosion measured over a specific dimension of the element. This diminution may occur on internal surfaces or external surfaces. Structural engineers take particular care to apportion the corrosion allowance in accordance with the design intention, particularly in relation to piping, vessels and tanks. The corrosion allowance affords the ...

Claims

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Application Information

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IPC IPC(8): B63B43/06B63B35/44B63B19/12B63B29/20B63B9/00B63B3/16
CPCB63B43/06B63B9/00B63B3/16B63B19/12B63B29/20B63B11/04B63B3/14B63B3/20B63B3/56B63B11/00B63B35/44B63B1/107B63B71/00
Inventor LARGE, EDWARD SEANRIJKEN, ORIOL R.
Owner SEAHORSE EQUIP
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