Device and method for installing deep sea submarine storage tank

Abstract

The invention discloses a device and a method for installing a deep sea submarine storage tank and belongs to the technical field of ocean engineering. The device and the method solve the problem of deep-sea installation of large submarine structures such as submarine storage tanks beyond joint capability of conventional floating crane lifting and rope capacity. The device for installing the deep sea submarine storage tank is composed of a lifting frame, a heaving compensator, a retractable winch, an oil supply ship and a packing fluid charging and discharging pipeline, the storage tank is filled with light liquids such as oil during installation on the sea, and the heaving compensator is used for reducing the additional inertia force caused by shaking of ships. By the aid of the device and the method, the problem that large facilities with dead loads exceeding kilotons can not be installed in the deep sea in the past is solved through reasonable combination of existing devices; the automatic balance between pressures inside and outside the tank is achieved through oil filling, and the structural design is easy to implement; and the heaving compensator is connected in series to conduct hoisting operations, so that the influence of environmental factors on devices such as floating cranes during installation of large underwater facilities can be reduced.

Description

technical field [0001] The invention belongs to the technical field of marine engineering, and relates to deep-sea installation technology for large-scale underwater structures such as seabed storage tanks. Background technique [0002] Limited by the lifting capacity and rope capacity of the floating crane, the maximum weight of a single unit installed on the deep seabed does not exceed several hundred tons at present, and there is no precedent for the installation of a huge structure with a self-weight of more than 1,000 tons in a sea area above 300m. Although the maximum lifting capacity of large-scale offshore floating cranes reaches tens of thousands of tons, the effective lifting range is usually similar to the height of the boom. Some operators temporarily modify the floating cranes to increase the rope capacity of the winch and reduce the number of ropes for deep-sea installation. pulleys, which also greatly reduces the maximum weight of the monoblock that can be ins...

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Problems solved by technology

[0004] Our company has already applied for a patent - deep water underwater oil storage oil production system (CN101672176) proposed that large underwater storage tanks should be installed inflatable, which has the advantages of low cost, large buoyancy, and larger counterweight; The problem is that as the water depth changes, the air in the tank is greatly compressed and needs to be continuously inflated. When the water depth is high, a large amount of compressed air consumes high energy and it is difficult to select the air supply pipeline and equipment. It is only suitable for use when the water depth is shallow.

[0005] At present, facilities such as floating cranes, heave compensators, oil tankers, and large winches are mature technologies, but there is no technology that has been optimized and combined and used for the installation of large submarine facilities

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