Offshore hoisting method for large-scale valve on vertical pipe of floating production storage and offloading device

Abstract

The invention discloses an offshore hoisting method for a large-scale valve on a vertical pipe of a floating production storage and offloading device. The offshore hoisting method adopts the followingsteps that 1, a gantry crane is installed on a trolley crane; 2, a bent pipe is hoisted and fixed; 3, a temporary storage platform of a large-scale valve body is fixed; 4, the gantry crane is moved to a position above the large-scale valve; 5, the large-scale valve body is hoisted; 6, the large-scale valve body is hoisted to the temporary storage platform; 7, the gantry crane is moved to a position above the large-scale valve body; 8, the large-scale valve body is hoisted to above a production position; 9, the large-scale valve body is hoisted downwards; 10, the valve body is installed; 11, the bent pipe is moved to the production position for installation; and 12, all hoisting equipment is disassembled, and the field is restored. According to the offshore hoisting method, the problem ofoffshore hoisting of the large-scale valve on the vertical pipe of the offshore floating production storage and offloading device is solved, moreover, the problems that in the case of the large-scalevalve on the vertical pipe of the offshore floating production storage and offloading device, the maintenance cost is relatively high, and the construction period is relatively long are solved; and the offshore hoisting efficiency and safety of the large-scale valve are improved.

Description

technical field [0001] The invention relates to a hoisting method, in particular to an offshore hoisting method for a large valve on a standpipe of an offshore floating production, storage and offloading (FPSO) unit. It belongs to the field of marine petrochemical industry. Background technique [0002] Currently, when lifting the riser of an offshore floating production storage and offloading unit (FPSO), replacing the rotating flange or repairing the valve, the valve body needs to be disassembled and hoisted. Since the offshore floating production storage and offloading unit (FPSO) has huge oil and natural gas production capacity, and its natural gas transportation pipeline is generally large in size and high in pressure level, therefore, the riser of the offshore floating production storage and offloading unit The size and weight of the valve are also relatively large. Taking a 20-inch 2500-pound valve as an example, its total weight reaches 43.5 tons, and the valve weig...

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Problems solved by technology

[0003] The main purpose of the present invention is to overcome the above-mentioned shortcomings existing in the prior art, and to provide an improved offshore hoisting method for large valves on the standpipe of floating production, storage and offloading devices, which is not affected by the offshore environment, and not only solves the problem of The problem of offshore hoisting of large valves on the standpipe of the floating production, storage and offloading device, and the problem of high maintenance costs and long construction period for large valves on the riser of the floating production, storage and offloading device have been solved, greatly Improved offshore lifting efficiency and safety of large valves on FPSO risers

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