Integrated construction process of FPSO methanol cabin flare tower base

Abstract

This invention discloses an integrated construction process for the methanol tank flare tower base of an FPSO, comprising the following steps: a) assembling the methanol tank section and the flare tower base; b) dividing the methanol tank module into sections with a reserved isolation space pattern; c) constructing and assembling each section using different methods: the flare tower base section is constructed using the plane above the section frame as the base surface, the upper methanol tank section is constructed using the deck as the base surface, and the lower methanol tank section is constructed using the bottom of the tank as the base surface. A primary assembly is performed on the flare tower base section and the upper methanol tank section, followed by a secondary assembly on the section brackets; d) the methanol tank module is sandblasted and painted; e) the complete methanol tank module is hoisted onto the ship and assembled using a floating crane. This invention, through the pre-defined isolation space pattern of section division, creates a prerequisite to avoid damage to the coating inside the methanol tank, while simultaneously solving the structural alignment problem through the primary assembly of the critical sections, the flare tower base and the upper methanol tank section.

Description

Technical Field

[0001] This invention relates to the field of methanol tank and flare tower base construction for Floating Production Storage and Offloading (FPSO) projects, and particularly to an integrated construction process for FPSO methanol tank and flare tower base. Background Technology

[0002] The methanol tank and flare tower are both key facilities on a Floating Production Storage and Offloading (FPSO) vessel. Methanol is an important cleaning agent in FPSO oil treatment, primarily used to remove waxes and foam from petroleum. The methanol tank is where methanol is stored, and its storage environment has extremely high requirements, requiring the steel surface pretreatment to meet Grade ISO8501-1 / Sa3 level, with water-soluble salt content <30 mg / m³. 2 (The most stringent PSPC requirement in shipbuilding is only surface pretreatment of Sa2.5 grade, with water-soluble salt content < 50 mg / m³) 2 The flare tower of a floating production storage and offloading (FPSO) unit is over 100 meters high, and its requirements for precision and welding quality are extremely strict. Any misalignment or welding defect could lead to catastrophic consequences. Avoiding damage to the coating inside the methanol tank and misalignment of the flare tower base is a problem that must be solved. Summary of the Invention

[0003] The purpose of this invention is to provide an integrated construction process for the FPSO methanol tank flare tower base.

[0004] The technical solution adopted by the present invention to achieve the above objectives is: an integrated construction process for the FPSO methanol tank flare tower base, comprising the following steps:

[0005] a. Assemble the methanol tank section and the flare tower base, with the flare tower base installed on the methanol tank section;

[0006] b. The methanol tank module is divided into sections with reserved isolation space. The shaded area is the methanol tank, the upper part of the methanol tank is the flare tower base, the part above the section seam mark of the methanol tank is the upper section of the methanol tank, and the part below the section seam mark is the lower section of the methanol tank.

[0007] c. Each section is constructed and assembled in different ways. The flare tower base is constructed on the plane above the section frame as the base surface, the upper section of the methanol tank is constructed on the deck as the base surface, and the lower section of the methanol tank is constructed on the bottom of the tank as the base surface. The flare tower base and the upper section of the methanol tank are assembled once, and then assembled a second time on the section bracket.

[0008] d. The methanol tank module is transported as a whole to the painting plant for sandblasting and painting;

[0009] e. Use a floating crane to hoist the complete methanol tank module onto the ship and assemble it.

[0010] In step b, an isolation zone of more than 500 mm is set around the methanol tank to block the influence of welding heat input on the coating inside the methanol tank.

[0011] In step c, the torch tower base is reverse-constructed on the plane above the segmented jig as the base surface. At the same time, a welding shrinkage compensation of 0.5mm is preset within the spacing of each longitudinal and transverse rib in the length and width directions of the ship to ensure the post-weld spacing value of the four aligned legs of the torch tower base.

[0012] This invention discloses an integrated construction process for the flare tower base of an FPSO methanol tank. By dividing the tank into sections with a pre-defined isolation space pattern, it creates a prerequisite for avoiding damage to the coating inside the methanol tank. The spacing of the flare tower base legs is ensured by using a dedicated section jig and pre-added welding compensation. At the same time, the structural alignment problem is solved by assembling the key sections of the flare tower base and the upper section of the methanol tank in one go. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall assembly of the flare tower base and methanol tank module in the integrated construction process of the FPSO methanol tank flare tower base of the present invention.

[0014] Figure 2 This is a schematic diagram of the segmented division of the reserved isolation space in the integrated construction process of the FPSO methanol tank flare tower base of the present invention.

[0015] Figure 3 This is a schematic diagram of the flare tower base segments and the upper section of the methanol tank in the integrated construction process of the methanol tank flare tower base of an FPSO according to the present invention.

[0016] Figure 4 This is a schematic diagram of the secondary assembly of the methanol tank module in the integrated construction process of the methanol tank flare tower base of an FPSO according to the present invention.

[0017] Figure 5 This is a schematic diagram of the hoisting and assembly of an integrated construction process for the FPSO methanol tank flare tower base according to the present invention. Implementation

[0018] like Figures 1 to 5As shown, the integrated construction process of the FPSO methanol tank flare tower base includes the following steps: a) Assemble the methanol tank section 2 and the flare tower base 1, with the flare tower base 1 installed on the methanol tank section 2; b) Divide the methanol tank module 8 into sections with reserved isolation space. The shaded area represents the methanol tank, and an isolation zone of more than 500mm is set around the methanol tank to block the influence of welding heat input on the coating inside the methanol tank. The upper part of the methanol tank is the flare tower base 1. The section seam mark 5 and above the methanol tank section seam mark 3 represents the upper section 3 of the methanol tank, and the section seam mark 5 and below the section seam mark 4 represents the lower section 4 of the methanol tank; c) Each section is constructed and assembled using different methods. The flare tower base 1 is constructed on the plane above the section jig 6 as the base surface, with its four legs as the positioning center. Assemble the corresponding structures, and simultaneously pre-set a 0.5mm welding shrinkage compensation within the spacing of each longitudinal and transverse rib in the length and width directions of the ship to ensure the post-weld spacing value of the four aligning legs of the flare tower base. The upper section 3 of the methanol tank is reverse-constructed with the deck as the base surface and the corresponding bulkhead structure is assembled. The lower section 4 of the methanol tank is forward-constructed with the bottom of the tank as the base surface and the corresponding bulkhead structure is assembled. The flare tower base 1 and the upper section 3 of the methanol tank are assembled once. After the first assembly, a second assembly is carried out on the section bracket 7. During this stage, the installation of all internal piping systems and outfitting components is completed. d. The methanol tank module 8 is transported as a whole to the painting workshop for sandblasting and painting. e. Using the floating crane 10 and the lifting sling 9, the complete methanol tank module 8 is lifted into the hull 11 of the conversion project and then assembled on the ship.

Claims

1. A method for integrated construction of the FPSO methanol tank flare tower base, characterized in that, Including the following step: a. Assemble the methanol tank section and the flare tower base, with the flare tower base installed on the methanol tank section; b. The methanol tank module is divided into sections with reserved isolation space. The upper part of the methanol tank is the flare tower base. The section above the section seam mark of the methanol tank is the upper section of the methanol tank, and the section below the section seam mark is the lower section of the methanol tank. An isolation zone of more than 500mm is set around the methanol tank to block the influence of welding heat input on the coating inside the methanol tank. c. Each section is constructed and assembled in different ways. The flare tower base is reverse-constructed with the plane above the section jig as the base surface, the upper section of the methanol tank is reverse-constructed with the deck as the base surface, and the lower section of the methanol tank is constructed with the bottom of the tank as the base surface. The flare tower base and the upper section of the methanol tank are assembled once, and then assembled a second time on the section bracket. The flare tower base is reverse-constructed with the plane above the section jig as the base surface. At the same time, a welding shrinkage compensation of 0.5mm is preset in the length and width directions of each longitudinal and transverse rib spacing to ensure the welding spacing value of the four aligned legs of the flare tower base. d. The methanol tank module is transported as a whole to the painting plant for sandblasting and painting; e. Use a floating crane to hoist the complete methanol tank module onto the ship and assemble it.

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