This document establishes a complete, industry-compliant classification system for modern offshore engineering vessels and special operation ships. It defines six major categories with detailed features and applications for each vessel type, providing a unified technical reference for offshore construction, transportation, operation, and maintenance.

Floating crane, also known as crane vessel or floating crane, is a specialized marine engineering equipment that takes self-propelled or towed floating hull as the supporting and operating device, mainly used for offshore lifting, loading and unloading, marine engineering construction, salvage and other tasks. This document comprehensively elaborates on the basic definition, core components, standard classification (in accordance with GB/T 6974.7-2022), key mechanisms and components, structural design requirements, main functions and application scenarios of floating cranes, and lists major domestic crane vessels, as well as the development status at home and abroad, providing a complete and professional technical reference for relevant practitioners.

This paper systematically introduces the classification, structure, working principle, technical performance, productivity calculation, positioning and moving modes, as well as complete construction procedures and key points of grab dredgers. It summarizes the applicable scope of different grabs under various soil conditions, and clarifies the requirements of trenching, staging, layering and slope excavation. Meanwhile, the advantages and disadvantages of grab dredgers in port dredging, river regulation and waterway engineering are analyzed. The content can provide complete technical reference for construction organization, operation control and efficiency optimization of grab dredging projects.

This document systematically classifies mud barges used in dredging, port construction and waterway engineering, covering closed-bottom, bottom-dump, side-dump and split-hull types. It specifies relevant stability regulations, structural and mechanical technical requirements, and summarizes major operational risks including collision, grab impact, stability loss and mechanism failure. It also provides maintenance suggestions and current development trends of large-capacity self-propelled mud barges in domestic and overseas engineering applications.

This paper studies fault diagnosis and maintenance strategies for hydraulic motors used in engineering vessels under harsh marine conditions. An integrated diagnostic method combining pressure-flow characteristics, volumetric efficiency testing, oil monitoring and trend analysis is proposed. Effective maintenance and preventive measures are provided to improve reliability and service life.

This news introduces CRCC Piling No.1, the world’s tallest pile frame pile driving vessel, officially delivered in Nantong on March 31. The vessel sets three world records: 156-meter pile leader frame, 700-ton maximum pile weight, and over 70-meter operating water depth. It is China’s first large piling vessel equipped with a DP system, featuring centimeter-level positioning accuracy and unlimited navigation area. It applies two globally pioneering technologies: integrated DP + mooring positioning system and main cylinder closed-loop hydraulic energy recovery system. Fitted with a world’s largest 5000-ton opening-closing hydraulic cylinder and green emission systems, the vessel will support global offshore wind power, cross-sea bridge, and deep-sea engineering projects, starting with the Salvador Bridge in Brazil.

By the end of 2025, CCCC Dredging owns the world’s largest and most technologically advanced dredging fleet. In 2025, the company optimized its fleet structure by launching new high-end dredgers, phasing out old inefficient vessels, and improving operation efficiency. Key new equipment includes 35,000m³ large trailing suction hopper dredgers, the world’s largest fully electric detachable environmental cutter suction dredger, and intelligent eco-dredgers. Technological breakthroughs were made in alpine shield machines, domestic core components, and AI-assisted construction. CCCC Dredging will continue to lead the industry with large-scale, green, and intelligent development.

This article by Yanyang Marine—boasting 30+ years of second-hand vessel trading experience and rich export cases of dredgers, pile driving barges, crane barges, and offshore vessels—systematically explains the full handover process for second-hand vessel transactions. It covers core buyer and seller preparation, key details of MOA drafting and negotiation under Norwegian Saleform 2012, pre-delivery preparation, legal and physical handover requirements, and post-delivery procedures. It also highlights Yanyang Marine’s one-stop professional services to help dredging and marine engineering enterprises avoid risks and ensure smooth vessel transactions and exports.

This paper focuses on second-hand engineering vessels such as dredgers and floating cranes, explaining the definition, logic and core roles of the international ship sale compliance matrix. It lists six core compliance modules, points out domestic ship export compliance flaws, and highlights full-process compliance control for safe cross-border vessel transactions.

Huge Backhoe dredger with China’s first huge excavator XCMG XE5600 mining excavator is under construction, available for pre-sale. Modified for marine use, it offers 30m digging depth and 35m³ bucket capacity, CCS classed, to be delivered by end of 2026.

This paper provides an in-depth analysis of the core terms, classic power combinations and applicable scenarios of tugboat propulsion systems, elaborates on azimuth propulsion structures such as ASD/AZI/Z-Drive, sorts out the core performance indicators, supporting equipment and load control methods of tugboats, offers targeted selection suggestions and predicts the industry's decarbonization and intelligent development trends, serving as a professional reference for tugboat design, transformation and operation selection. 英文关键词

Modular small-middle size CSDs are and friendly transportable but have lower structural strength and seakeeping, suited for calm inland waters. Yanyang Marine' s Integrated-hull CSDs feature a rigid, one-piece structure with superior stability and ocean-going capability, ideal for harsh marine environments. This is a real small size Marine CSD which is real good solution for port(coastal) dredging.

This article specifies the complete after-sales service system for high-value exported engineering vessels including dredgers,motor hopper, pile drivers and floating cranes. Covering the whole process from contract signing to warranty management, it includes pre-delivery training, vessel transportation assistance, on-site commissioning, remote technical support, spare parts supply, on-site repair and software upgrading, aiming to ensure stable operation and minimize downtime for shipowners, complying with international and industry practices.

A new 3,200 m³ split hopper barge of Yanyang Marine has been successfully launched at the shipyard, with the official commissioning scheduled for June, available for immediately sales to international buyers.

Capital dredging refers to a one-time, large-scale dredging operation conducted to build or initially develop water infrastructure such as ports, navigation channels, wharves, and reclaimed land areas. Its purpose is to create new navigational conditions or water space, and it constitutes a core component of the engineering construction phase.

This document classifies dredging floating pipelines into three core types: integral self-buoyant pipes, steel pipes with external floats, and semi-submersible suspended pipes. It details their structure, features, applications, and selection rules, plus operational guidance for safe, targeted use in inland and offshore projects.

This article illustrates the construction advantages of backhoe dredgers through a 30,000-ton port terminal project. Targeting challenges posed by semi-consolidated cemented sand and reefs, the Hitachi EX5500 backhoe dredger achieves 3,600 cubic meters of daily dredging, completes 220,000 cubic meters in 60 days (halving the schedule), and boosts efficiency by over 3 times compared to traditional methods. It is suitable for projects with limited space and strict vibration requirements, with broad market prospects.

Based on Announcement No. 28 of 2017 issued by the Ministry of Commerce and the General Administration of Customs ,the export of dredgers(dredging vessels) from China is subject to export control and a licensing system. Dredgers meeting the controlled parameters must first obtain the "Export License for Dual-Use Items and Technologies" from the Ministry of Commerce, and then complete all subsequent compliance procedures with customs, classification societies, and maritime authorities before they can be legally exported.