Embedded Methanol Bunker Layout for ULCC Cargo Capacity
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Solution Overview
Problem
The application of methanol fuel tanks in ultra-large crude oil carriers (ULCCs) faces challenges due to space occupancy, corrosive nature requiring expensive coatings, and unique compartment arrangements, which affect cargo tank capacity and construction complexity.
Innovation Solution
A method for installing embedded methanol fuel tanks in ULCCs involves a three-sided structural arrangement with a central methanol fuel tank surrounded by isolation tanks, utilizing existing bulkheads for double-walled protection, and optimizing transverse and longitudinal bulkheads to minimize internal components and reduce structural weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If methanol fuel tanks are installed in ULCCs, then green fuel capability is achieved, but cargo tank capacity is reduced
Solution Approach 1:
The methanol fuel tank is nested within the central cargo tank space by utilizing the three-compartment arrangement. The fuel tank is positioned in the middle compartment of the cargo tank, effectively using existing structural space that would otherwise be unused or partially used, thereby achieving green fuel capability while minimizing impact on cargo capacity
Solution Approach 2:
The patent utilizes the vertical dimension and three-dimensional space optimization by strategically positioning the methanol fuel tank in the central compartment. The tank is designed to fit within the available vertical and horizontal clearance, optimizing the use of three-dimensional space rather than simply adding external tanks that would occupy additional volume
2Quantity of substance
If methanol fuel tanks are installed on both sides, then fuel capacity is increased, but vessel tilt occurs
Solution Approach 1:
The patent deliberately adopts an asymmetric configuration by placing the methanol fuel tank only in the central compartment rather than symmetrically on both sides. This asymmetric placement achieves the required fuel capacity while maintaining vessel stability by avoiding the trim and list issues that would result from asymmetric fuel consumption in side-mounted tanks
3Reliability
If special coating is applied to methanol fuel tanks, then corrosion protection is achieved, but construction cost increases
Solution Approach 1:
The patent merges the methanol fuel tank structure with the existing cargo tank bulkheads and structural components. By using the original bulkheads of the central cargo tank and new bulkheads as shared structures, the design reduces the total surface area requiring special anti-corrosive coating, thereby lowering construction costs while maintaining adequate corrosion protection
Solution Approach 2:
The bulkheads serve multiple functions: they form the boundaries of the cargo tank, provide structural support, and serve as the outer shell of the methanol fuel tank. This multi-functionality reduces the need for additional components and minimizes the surface area requiring expensive special coating
4Strength
If multiple components are installed inside the tank, then structural strength is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple structural functions into existing bulkheads and tank walls. The original cargo tank bulkheads serve as both cargo boundaries and fuel tank boundaries, eliminating the need for separate internal support structures and reducing manufacturing complexity while maintaining structural strength
Data Source
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AI summary
A method for installing embedded methanol fuel tanks in ultra-large crude oil carrier is disclosed, wherein a plurality of rows of cargo holds are provided in a cargo hold area, a middle cargo hold is in the center of each row of cargo holds, a first transverse hold wall (1) is additionally provided in one of the middle cargo holds, and a methanol bunker is provided between the first transverse hold wall (1) and the transverse hold wall (10) of the middle cargo hold. The method comprises: determining the capacity C of the methanol bunker, determining the total length L1 and the width B1 of the methanol bunker for the first time, determining the number Ni of reinforced bulkhead spacings of the cargo hold occupied by the methanol bunker, determining relative positions of a newly added transverse hold wall (5) and a newly added longitudinal hold wall (6), and providing swash bulkheads (2) and cross braces (7) in side cargo holds on the two sides of the middle cargo hold where the methanol bunker is located. The method for providing an embedded methanol bunker in an ultra-large oil tanker can simplify the construction process, reduce the structural weight, reduce the number of members, shorten the construction period, and reduce the weight of an empty tanker.