A method of constructing a mark iii type liquefied natural gas carrier

By dividing the MARK III liquefied natural gas carrier into bow and stern sections for separate fabrication and strength testing, and then assembling them using a small dry dock, the problems of long construction cycles and high costs were solved, achieving efficient resource utilization and a shorter construction cycle.

CN121224939BActive Publication Date: 2026-07-24DALIAN SHIPBUILDING INDUSTRY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DALIAN SHIPBUILDING INDUSTRY CO LTD
Filing Date
2025-09-29
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

The cargo containment system of the MARK III type liquefied natural gas carrier has a long construction period and is very difficult to construct, which occupies a lot of dock resources. Conventional construction methods result in insufficient or wasted dock length, which increases construction costs. In addition, the ballast tank strength test cannot be carried out in the dock, which affects construction efficiency.

Method used

The hull is divided into bow and stern sections, which are manufactured and painted separately. Then, a strength test is conducted under ballast water conditions in the ballast tanks. The sections are assembled using a small dock space, and a ballast tank strength test is conducted using a diagonal ballast water method to ensure structural strength. The cargo containment system is then constructed in the dock.

Benefits of technology

This approach enables the rational use of dock resources, shortens the construction cycle, reduces costs, improves construction efficiency, ensures the structural strength of the hull, and meets the construction requirements of the cargo containment system.

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Abstract

A construction method of a MARK III type liquefied natural gas transport ship, which utilizes a small dock or a free area of a dock, adopts a watertight structure design meeting structural strength, divides a MARK III type liquefied natural gas transport ship into two sections (to become a bow half section and a stern half section) by taking an isolated empty cabin between any cargo cabin as a boundary, adopts a floating butt joint mode to form a whole ship after completing a ballast cabin strength test, and carries out each process of a cargo containment system after butt joint. The whole ship is floated out of the dock after the main hull is formed and the shaft rudder system is constructed, and the remaining cargo containment system is constructed during a wharf mooring stage, so as to reduce an underwater construction period. The construction method utilizes a small dock or a free area of a dock to construct a liquefied natural gas transport ship, and makes a cargo containment system have a construction condition in advance, shortens a construction period of the whole ship, efficiently utilizes core resources of ship construction, reduces a total construction period of the ship, and reduces construction cost.
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