Sea pipe distribution system and method of off-land pipeline with one or more fittings

Abstract

Marine pipelaying method and system for installing an offshore pipeline (1) that includes one or more accessories (10). The method includes the steps of providing a vessel (2), launching the pipeline (1) in a firing line from the vessel (2) in the direction of the seabed, engaging the pipeline (1) with a clamping device (5b) that is connected to the vessel (2) and adapted to support the weight of the previously launched pipeline (1), and moving the accessory (10) into the firing line to a position above the clamping device (5b). Then the accessory (10) is connected to the pipeline (1) above the clamping (5b) device while the pipeline (1) is held by the clamping device (5b) Follow that the accessory (10) and the launched pipeline (1) connected thereto and releasably secured to a controlled load hoisting device (5) and the weight of the accessory (10) and the launched pipeline (1) connected thereto are transferred from the clamping device (5b) to the controlled load hoisting device (5) while the accessory (10) and the launched pipeline (1) connected thereto remain in the firing line. Finally the clamping device (5b) is disengaged from the pipeline (1) and moved away from firing line. Then the accessory (10) and the launched pipeline (1) connected thereto are lowered along the firing line by the controlled load hoisting device (5).

Description

technical field [0001] The invention relates to the underwater arrangement of offshore pipelines. More specifically, the subject matter of the present invention relates to an offshore piping system and method for installing an offshore pipeline with one or more attachments. Background technique [0002] Subsea pipelines are mostly deployed on the ocean floor by being connected or welded on the deck of the ship, lowering the rear of the ship and then laying on the ocean floor. The offshore pipeline industry uses a variety of piping concepts. [0003] A generally known technique is called the S-arrangement technique. In the S-layout technique, sections of pipe are added to a pipeline that has previously been launched into the water in an assembly line, usually including one or more welding stations, that is deployed at or near the level of a pipe-laying vessel such as a lay barge. horizontal position. The pipeline is then bent over the stern by means of a ramp or guide fra...

AI Technical Summary

Problems solved by technology

[0011] These known techniques of inserting an accessory into or at one end of a pipeline while laying out an offshore pipeline are unsatisfactory

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