Zhenjiang Seagoing Vessel Anchorage launches maintenance dredging in 2026 with a total construction period of 125 days, to be completed by late November 2026. Zonal and time-phased construction is adopted; no works during the flood season. Non-construction vessels are prohibited from entering the construction zone. All passing ships shall slow down, keep safe distance and follow on-site commands.

This report analyzes the 2025 global tugboat delivery market using S&P Maritime Portal data covering 1,067 vessels. The market is dominated by standard tugboats, with engines led by Yanmar and Mitsubishi. Construction is concentrated in Southeast Asia, especially Indonesia. Most tugboats are in the 1000–2000KW power range, and the top shipyard is Karya Teknik Utama. The industry shows high regional concentration, specialization, and growing demand for eco-friendly tugboats.

This paper introduces ten typical faults occurring during the operation of trailing suction hopper dredgers, including blockages of drag head, suction pipe, mud pump and discharge pipeline, vessel tilt during discharging, mud door leakage, drag head steel cable breakage, sand pumping channel blockage, shore pipe blockage and sand overflow. Corresponding symptoms and on‑site troubleshooting measures are provided for each fault to support safe and efficient dredging construction.

In dredging construction, cutter suction dredgers often encounter various abnormal conditions that require shutdown for handling. Correct judgment and proper treatment can effectively reduce invalid downtime and improve the effective dredging time of construction vessels. This paper summarizes 9 common abnormal conditions of cutter suction dredgers, including suction port blockage, cutter head blockage by hard sticky clay, collision with underwater obstacles, unable to lift transverse mooring anchor, discharge pipeline blockage, dredge pump blockage, water pipeline burst, unable to lift steel piles, and unable to lift cutter bridge. For each abnormal condition, it analyzes the causes, identification methods, treatment measures and preventive strategies in detail, providing practical technical guidance for on-site construction operation and fault handling of cutter suction dredgers.

This paper systematically introduces the preparation of wear spare parts for cutter suction dredgers under different soil conditions, including silty soil, cohesive soil, sandy soil, gravelly soil and rocky soil. It clarifies the selection principles of dredge cutters and pump impellers, analyzes wear characteristics and replacement cycles of flow-passing components, and provides guidance for reasonable spare parts storage and construction efficiency improvement in dredging projects.

This paper systematically discusses the construction safety management of port and waterway engineering. It summarizes the technical specifications and management requirements of safety accident prevention, risk assessment, emergency plan, underwater and in-water operation management, construction electricity, piling, component installation, large construction ship operation, wind and typhoon prevention. A complete safety control system covering the whole construction process is formed to provide reference for on-site safety management and risk control of port and waterway engineering.

This guide provides comprehensive technical insights into cutter suction dredgers (CSD) and bucket ladder dredgers (BLD), two core equipment types in modern dredging engineering. It covers standardized Output Calculation formulas, key operational parameters, and detailed construction methods including spud positioning, lane-by-lane excavation, layered dredging, and barge transportation workflows. The documentation includes precise parameter tables for bucket chain speed, filling factors, and soil classification, alongside step-by-step construction flowcharts and compliance with international dredging standards. Ideal for dredging project managers, technical engineers, and maritime professionals, this resource serves as a practical reference for optimizing dredging efficiency, ensuring construction quality, and meeting project schedule requirements in marine and inland waterway projects.

This paper systematically explains the whole process and practical operation of marine engineers taking delivery of international secondhand ships, combined with the Norwegian Standard Form (NSF93). It includes pre‑delivery inspection, ship following, pre‑registration, on‑site handover, underwater survey, fuel and lube oil verification, document handover, dispute resolution and post‑delivery work, so as to help buyers avoid transaction risks and complete ship delivery smoothly.

This document specifies the standardized safety management procedures for cutter suction dredgers in offshore construction, covering vessel mobilization and demobilization, on-site construction control, equipment inspection, confined and hot work management, and hidden danger rectification. It clarifies requirements for navigation alerts, communication, certification, emergency plans, and operational discipline to prevent collisions, mechanical failures, suffocation, fire, and other hazards, ensuring safe and compliant dredging construction.

This paper analyzes seven typical accidents of offshore engineering vessels, including crane failure, sinking, suffocation, explosion, and collapse. It summarizes high-risk characteristics such as complex equipment, mixed personnel, environmental sensitivity, and frequent confined space operations. Ten safety measures and a four-level graded emergency management system are proposed to prevent disasters. The conclusion emphasizes strict corporate responsibility, standardized confined space operations, enhanced safety redundancy, and strict vessel inspection to fundamentally avoid casualties and major losses.

Abstract: This news announces the start of construction of a deep-water crane vessel designed by MARIC (708 Institute) with a cost exceeding 1.1 billion yuan (contract value 1.1488 billion yuan). The vessel is built by Shanghai Zhenhua Heavy Industries for Guangzhou Salvage Bureau, featuring 142-meter pile legs, 90-meter water-depth operation, 210-meter lifting height, and 1600-tonne leg-encircling crane. With full electric propulsion and DP2 dynamic positioning, it serves multi-purpose tasks including emergency salvage, offshore wind installation, platform maintenance and living support. The vessel will strengthen China’s offshore emergency response and marine engineering capacity.

This article systematically sorts out the full‑life cycle vessel system for offshore wind power projects, including survey vessels, transport barges, crane vessels, pile‑driving vessels, bottom‑sitting platforms, jack‑up installation vessels, floating installation vessels, cable laying vessels, and O&M vessels. It supplements key content including bottom‑sitting construction technology that originated from intertidal wind farms, domestic vessel parameters, completed wind farm lists, global landmark projects, and transport‑installation separation technology. The paper also summarizes industry trends such as deep‑water development, large‑scale turbines, grid parity, and high‑efficiency construction, as well as future directions including big data, intelligent management, and localization of core components. It provides a complete, non‑omitted overview of offshore wind construction equipment for engineering, investment, and operational reference.

This report analyzes China’s deck barge market from 2024 to 2025, focusing on the 5,000 DWT aft-steered deck barge with ramp — the most popular and liquid type. Newbuilding prices range RMB 28–41 million, while secondhand prices decline with age (RMB 5.8–24 million). Daily charter rates are RMB 21,000–27,000, with secondhand assets offering faster payback. Strong demand comes from domestic and overseas infrastructure, especially Southeast Asia. The market is booming with growing momentum toward larger tonnages and offshore wind specialized vessels.

This paper introduces the classification, structural characteristics, working principles, operation methods and safety requirements of self-unloading sand barges and self-suction self-unloading sand barges(3 in 1 dredger). The self-unloading sand barge can realize automatic unloading through gravity and conveying system without relying on shore cranes. The self-suction self-unloading sand barge integrates three functions of sand suction, transportation and unloading. This paper also clarifies the applicable scenarios, industry specifications and safety regulations of such vessels, which can provide reference for engineering design, construction operation and safety management.

This report analyzes the global grab dredger market with a focus on real market structure: large state-owned dredging companies pursue high-end, green, and intelligent technologies; private shipowners mainly replace old vessels with larger ones; emerging markets still rely on traditional and non-self-propelled dredgers. High-end, green, and intelligent trends apply only to top players, while upscaling and practicality represent the real mainstream.

This document outlines the classification, specifications, and technical features of dredging rubber hoses used in marine engineering. It details the functional differences between suction and discharge hoses, installation variations like floating and submerged hoses, and structural types including flanged and armored hoses. Key specifications cover diameters from DN150 to DN1300 and pressure ratings up to 2.5 MPa. The text emphasizes the composite reinforcement structure, combining soft spiral steel wire helix with high-strength fiber layers to ensure durability, flexibility, and resistance to abrasion and pressure in harsh dredging environments.

This paper systematically introduces the basic structure, classification, main equipment and construction technology of piling barges widely used in hydraulic engineering, bridges, wharves and offshore wind farms. It analyzes the technical characteristics of three typical offshore foundation types and the construction process of steel pipe pile sinking. The development trend of large-scale, multi-functional and environment-friendly piling barges is summarized. In addition, the performance and advantages of hydraulic piling hammers are compared with those of traditional diesel hammers, indicating that hydraulic hammers feature high energy transfer efficiency, low noise and environmental friendliness, making them the preferred equipment for large-scale pile foundation engineering.

This document introduces the standard bollard pull test for tugboats, including test purposes, preparation, procedures, data processing, key precautions and common errors for delivery, retrofit and classification certification.