Optimal design method for cathode protection system of drilling platform ballast water tank

A cathodic protection, drilling platform technology, applied in the field of marine engineering, to achieve the effect of reducing weight, improving operating capacity, and increasing variable load

Inactive Publication Date: 2011-05-04
DALIAN UNIV OF TECH
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Problems solved by technology

[0011] In order to solve the problems existing in the prior art, the purpose of the present invention is to provide a device that can solve the problem of "absorbing shielding effect" caused by piping systems and related equipment, and the problem of "shielding shielding effect" caused by complex structu

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  • Optimal design method for cathode protection system of drilling platform ballast water tank
  • Optimal design method for cathode protection system of drilling platform ballast water tank

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Embodiment Construction

[0025] The beneficial effects of the present invention will be further described below in conjunction with the accompanying drawings. The present invention calculates as follows taking the ballast water tank of certain in-service deepwater semi-submersible drilling platform as an example:

[0026] The basic parameters required by the design: the design life is 12 years, the protection area is 59228m2, the service marine environment parameters...etc.

[0027] When adopting the traditional method, referring to the DNV specification and combining the empirical formula provided by it, the anode layout scheme A is obtained:

[0028] Anode position: (omitted);

[0029] Total weight of anode: 36117.1kg;

[0030] Number of anodes: 1184 pieces.

[0031] However, when the method of the present invention is adopted, the setting of scheme A is calculated once, that is, without optimization, and the actual protection life of scheme A is only 10.81 years. The protection lifetime can be ...

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Abstract

The invention discloses an optimal design method for a cathode protection system of a drilling platform ballast water tank. Based on boundary element numerical value analog simulation calculation, the optimal design method comprises the following steps: carrying out geometric modeling to a target platform by computer modeling software, and determining numbering information, space coordinate information and other information of each unit and each node in a boundary element model; loading an anode control module to generate digitalized sacrificial anode information; carrying out numerical value simulation calculation by a boundary element algorithm; judging whether the calculation result conforms to polarization characteristics; and judging whether optimized conditions are satisfied nor not. In the method, numerical value calculation is carried out on the basis of the boundary element algorithm, continuous potential information of the structure surface can be obtained, and when the protection potential of any local structure can not satisfy the requirement, the anode is adjusted and calculated again until all protection potential at any position satisfies the requirement. Thus, the problems of 'adsorption-type shielding effect' and 'dodging-type shielding effect' are perfectly solved, and the service life of the platform is prolonged.

Description

technical field [0001] The invention relates to the anti-corrosion design technology of the ballast water tank of the deep-water semi-submersible drilling platform in the field of ocean engineering, in particular, a sacrificial anode for the ballast water tank of the deep-water semi-submersible drilling platform is optimized in quantity and reasonable in space Optimal design method for ballast water tank cathodic protection system of arranged drilling platform. Background technique [0002] The deep-water semi-submersible drilling platform operates in the open sea all the year round, and the corrosion of the structural steel plate will lead to a decrease in the structural reserve strength and reduce the safety of the operation. At the same time, the platform operates in the open sea, and the cost of docking and maintenance is relatively high. In order to reduce structural corrosion, it is necessary to carry out anti-corrosion design and optimize the platform as a whole. [...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 黄一
Owner DALIAN UNIV OF TECH
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