On May 13, the third docking batch of the year arrived at Jiangnan Shipyard’s No. 3 Dock, featuring the undocking of two complete vessels and the floating of one complete vessel and one semi-vessel.
For this docking batch, the construction team strengthened the衔接 of various departments and processes, fully reserving construction cycles for the new 1600-ton gantry crane. Through management improvement and technological progress, a smooth undocking was ensured within 42 days, laying the foundation for the successful completion of the annual production target of eight docking batches.
The 8th vessel (H2715) of the 99,000 m³ VLEC series built by Jiangnan Shipyard for Southwest Shipping Company was undocked as a complete vessel. The construction team adhered to equal emphasis on quality and progress, strictly implemented safety control measures, and ensured the high-quality and efficient launch of the vessel with hardcore intelligent manufacturing capabilities. Under the efficient推进 of the “33-rhythm” construction mode, the vessel completed the painting of all ballast tanks, achieving installation integrity of the three engine room mega-blocks from the platform block stage, forming a stable rhythm for rapid engine room formation and outfitting-to-painting transition, ensuring the smooth progress of subsequent dock mooring tests; cargo tank epoxy was cleared, painting of 90A, 90B, 90C outer walls was completed, all scaffolding was removed, providing support for subsequent dock construction phase work; engine room area painting was completed, engine room power grid was energized, acceptance of forward conventional piping systems was completed, liquid cargo piping splicing was finished, and operations in various areas were completed simultaneously, laying a solid foundation for subsequent dock commissioning.
The 14,000 TEU single-fuel container ship built by Jiangnan Shipyard for Bocom International Shipping Company was undocked as a complete vessel. Before undocking, the vessel achieved the “331” target, i.e., “three clearances” (erection clearance, box test clearance, and painting clearance), “three network connections” (piping network connection, power grid connection, and information network connection), and on the basis of the generator being ready for testing, completed the removal of scaffolding in areas including the generator room; completed full-ship simulated box testing and simulated container stacking lashing experiments, ensuring the smooth and efficient progress of subsequent dock phase construction and commissioning.
The two vessels floated simultaneously were the 175,000 m³ LNG carrier H2716 built by Jiangnan Shipyard for Shandong Marine Energy Group as a complete vessel, and the 15,000 TEU methanol dual-fuel container ship semi-vessel built for CMA CGM.
Facing the交叉作业 conflict between the construction of the new gantry crane anchoring structure and shipbuilding, the construction team and the gantry crane project team, through overall coordination and staggered scheduling; seizing the window period to resolve conflict risks; and employing three major methods including process control and target achievement, supplemented by refined whole-process management and technological breakthroughs, achieved multiple key construction indicators and solved the交叉作业难题.
Among them, the H2716 vessel, as the first-of-its-type carrier, had numerous construction highlights before floating:
Construction Method 2.0 implemented: Based on the mature construction experience of Method 1.0, the construction team took the lead in realizing the innovative practice of Method 2.0, and conducted a pressure test for 1.5M construction in the dock, laying a solid foundation for the subsequent annual construction of eight batches of LNG carriers, helping the company maintain its leading position in the LNG carrier construction field.
Floating rhythm record-breaking: Line pulling and optical alignment completed within 20 days of docking; line pulling, optical alignment, and main engine hoisting completed within 7 days; hoisting of containment system pump towers for 4 tanks completed before floating.
Significant efficiency improvement results in multiple areas: The cable laying rate for the entire ship steadily increased; the first complete installation of single-wall pipe mega-blocks in the superstructure was achieved; the first insulation construction for the main pipe rack of the liquid cargo system was completed; the first dual-inspection test of the main screen wall was completed, with the process precision and quality control of the entire ship’s containment system construction reaching internationally leading levels.
The 15,000 TEU methanol dual-fuel container ship, as the last vessel in the series, continued the floating status of the previous vessel; main engine and shafting hoisting were completed; the integrity work status of the engine room and cargo hold compartments was further improved, contributing to the high-quality undocking of the next batch.
