Connection structure and fatigue control method of fpso upper module under motion constraints

A module connection and motion constraint technology, which is applied to ship components, floating buildings, transportation and packaging, etc., can solve the problems of upper module deformation or tearing, insignificant cushioning effect, and fatigue cracks at the connection, so as to overcome the connection strength Weak, simple design, less difficult to install

Active Publication Date: 2018-02-13
BOMESC OFFSHORE ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cushioning effect of this structure is not obvious, the connection strength is weak, and the fatigue resistance is insufficient. Under the high periodic action of waves, fatigue cracks are prone to occur at the connection, and deformation or tearing of the upper module occurs.

Method used

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  • Connection structure and fatigue control method of fpso upper module under motion constraints
  • Connection structure and fatigue control method of fpso upper module under motion constraints
  • Connection structure and fatigue control method of fpso upper module under motion constraints

Examples

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0014] The connection structure of the upper module of the floating production, storage and offloading unit under movement constraints as shown in the accompanying drawing includes a plurality of hollow rectangular lower legs 3, and each of the lower legs 3 is welded on the main deck of the hull , a plurality of disc springs 4 are arranged on the bottom wall of the cavity of each of the lower legs, and the plurality of disc springs 4 are matched with the cavity of the lower legs, and a plurality of hollow The rectangular upper legs 2 are respectively inserted into the cavities of the lower legs in one-to-one correspondence, and the bottom wall of the upper legs 2 is supported on the Belleville springs, the upper legs 2 and the lower legs Cavity clearance fit. There is an ear plate extending outward around the upper opening of the lower leg 3...

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Abstract

The invention discloses an upper module connection structure of an FPSO (Floating Production Storage And Offloading) under motion constraint and a fatigue control method. The method comprises the following steps: step 1: setting the maximum value of displacement change of the upper module connection structure collected by a displacement sensor to a maximum displacement threshold of the upper module connection structure; step 2, extracting the time that the upper module connection structure exceeds the maximum displacement threshold and accumulating the time, performing non-destructive testing on the upper module connection structure when the cumulative time exceeding the threshold measured by a control system is more than 500 hours, and maintenance is performed when the maximum crack length of the upper module connection structure reaches 50% of a critical crack length. BY using the structure and method, a hull and an upper module thereof are stabile under the action of waves and have fatigue resistance.

Description

technical field [0001] The invention relates to a connection structure of upper modules of a floating production, storage and unloading device and a fatigue control method thereof, in particular to a connection structure of an upper module of a floating production, storage and unloading device under motion constraints and a fatigue control method thereof. Background technique [0002] Floating production storage and offloading device, FPSO (Floating Production Storage and Offloading), can carry out preliminary processing and storage of crude oil, and is called "offshore oil factory". FPSO is a comprehensive large-scale offshore oil production base that separates oil and gas from the extracted oil, treats oily sewage, power generation, heat supply, storage and transportation of crude oil products, and integrates personnel residence and production command system. In order to ensure the continuous production of the oilfield, FPSO cannot be docked for maintenance during its serv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B35/44B63B9/00
CPCB63B35/44B63B71/00B63B2035/4473
Inventor 丰军华王京风
Owner BOMESC OFFSHORE ENG CO LTD
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