Single point anchor leg relaxation processing method

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...

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

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