Single point anchor leg relaxation processing method

A treatment method, the technology of anchor legs, which is applied in the direction of warships, etc., can solve the problems of difficult control of construction progress, high cost of ships, and large impact, and achieve the effect of reducing release and tie-back work, reducing construction costs, and reducing construction risks

Inactive Publication Date: 2012-11-14
CHINA NAT OFFSHORE OIL CORP +3
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the selection of operating ship resources is relatively limited, the cost of ships is high, and this method is greatly affected by weather factors (generally, the combined wave height is 1.5m or below before lifting can be carried out), and the construction progress is difficult to control

Method used

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  • Single point anchor leg relaxation processing method
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  • Single point anchor leg relaxation processing method

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Embodiment Construction

[0032] The present invention adopts the following operation steps:

[0033] Step 1: At the offshore construction site—namely, several limit tugs are arranged around the floating production, storage and unloading tanker 3, and the heading of the offshore floating production, storage and unloading tanker 3 is controlled by the limit tugs;

[0034] Such as figure 1 As shown, at the offshore construction site—that is, several limit tugs are arranged around the floating production, storage and unloading oil tanker 3. In this embodiment, one main limit tug 1 and two auxiliary limit tugs 2 are arranged, and the limit tug The number and horsepower should be determined according to the size of the offshore floating production, storage and offloading tanker 3, and the tailing limit of the offshore floating production, storage and offloading tanker 3 by the limit tug is to limit the offshore floating production, storage and offloading tanker 3 in wind and waves. The rotation under the action ...

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Abstract

The invention relates to a single point anchor leg relaxation processing method which comprises the following operation steps: (1) arranging a plurality of limiting tugs at the periphery of a floating type producing, storing and unloading tanker, and controlling the heading of the marine floating type producing, storing and unloading tanker through the limiting tugs; (2) overtensioning the relaxed anchor leg; (3) cutting off the excess chain rings of a relaxed anchor chain section between two tensioning points; (4) arranging a safety belt between two ends of the anchor chain cut off; (5) connecting the anchor chain cut off by a diver; and (6) releasing a tensioner to make the anchor leg work normally. The single point anchor leg relaxation can be processed under the condition that the marine floating type producing, storing and unloading tanker is in service without stopping the marine floating type producing, storing and unloading tanker, thus a large amount of releasing and connecting work of the marine floating type producing, storing and unloading tanker is reduced. In addition, the construction cost is reduced greatly, and the work efficiency is improved. Furthermore, the construction risk can be reduced to a controllable range, and the orderly construction is guaranteed greatly.

Description

Technical field [0001] The invention relates to a mooring system, in particular to a method for treating slackness of a single-point anchor leg of an inner turret type single-point mooring system, and belongs to the field of offshore petroleum engineering. Background technique [0002] APL's STP (Submerged Turret Production) internal turret single point mooring system is a single point system widely used in offshore floating production storage and offloading tankers (FPSO). Affected by factors such as the installation error of the single-point mooring and years of use, individual anchor legs of the single-point system may slack, and the tension of the anchor leg is greatly reduced, and its tension will be transferred to other anchor legs. Take the 9-legged (divided into 3 clusters) single-point mooring system (STP) in the form of an internal turret as an example. The load of the other two anchor legs in the same cluster as the loose anchor legs will increase greatly and may excee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B63B21/00
Inventor 邓周荣刘义勇张人公苗春生王谦王火平刘书胜黄三平张印桐林守强宋春娜严国华高超黄佳瀚
Owner CHINA NAT OFFSHORE OIL CORP
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