What is the operational purpose of Active Heave Compensation (AHC) in deepwater Offshore Cranes?

When lowering equipment to the seabed (ranging from $500\text{m}$ to $3000+\text{m}$ depth), ocean wave motion causes the vessel to heave up and down, creating massive dynamic tension spikes and load swing:Real-Time Wave Tracking: Integrated Inertial Reference Units (MRUs) continuously measure vessel motion (heave, pitch, roll) in real time.Dynamic Winch Compensation: The AHC hydraulic or electric drive system automatically pays out or reels in the wire rope in milliseconds to counteract vessel movement, keeping the payload virtually stationary relative to the seabed and preventing dangerous seabed collisions or line snaps.

How do API Spec 2C and DNV-ST-0378 standards differ from standard land-based or marine crane regulations?

Offshore environments introduce severe dynamic forces that standard land crane codes (like FEM or CMAA) do not account for:Dynamic Coefficient Factors (Significant Wave Height): API 2C and DNV rules mandate calculations based on sea states ($H_s$), dynamic off-lead/side-lead angles, and vessel inclination during lifting.Extreme Fatigue & Redundancy Standards: Structural components, slewing bearings, and load-bearing welds undergo rigorous fatigue cycle modeling, non-destructive testing (NDT), and higher safety factors to prevent catastrophic structural failure at sea.

What are AOPS and MOPS safety systems, and why are they critical for offshore marine safety?

Overload events at sea can capsize vessels or snap crane booms within seconds. Modern offshore cranes incorporate two essential fail-safe overload systems: AOPS (Automatic Overload Protection System): Automatically triggers when dynamic loads exceed safe working limits during supply vessel unloading, paying out wire rope smoothly to prevent structural overloading without operator intervention. MOPS (Manual Overload Protection System): Allows the operator to manually disengage the winch brake during emergency entanglements (e.g., if a subsea load gets caught on the sea floor or a drifting barge).

How do I choose between a Lattice Boom, Box Boom, and Knuckle Boom Offshore Crane for my vessel?

Boom architecture dictates outreach, weight, and deck space optimization:Lattice Boom Pedestal Crane: Ideal for deepwater drilling rigs and heavy-lift wind installation vessels. Offers lightweight structural design, high lifting capacity, and superior wind resistance at long radii ($>60\text{m}$).Knuckle Boom Crane: Preferred for OSVs, subsea construction, and crowded FPSO decks. The articulated joint reduces load pendulum length, lowers the center of gravity, and folds compactly to save valuable deck area.Stiff Box Boom Crane: Perfect for general platform supply transfers and short-to-medium reach operations requiring robust, low-maintenance mechanical construction.

Offshore Crane

Marine deck crane in operation – heavy-duty offshore lifting for port and wharf

Telescopic boom crane for port operations – efficient wharf material lifting

Offshore crane lifting heavy cargo at sea – durable marine deck crane for ships

Knuckle telescopic boom crane for ship lifting – robust offshore marine equipmen

Authentication mark:

Capacity:2~20t (customizable)

Lifting Height:(customizable)

Voltage/Hertz:(customizable)

Brand Name: YUNTIAN

Place of Origin: Henan, China

Product manual

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Introduction

Technical Data (General Version)

Application

Features

PRODUCT INTRODUCTION

The Offshore Crane is a heavy-duty lifting solution engineered for harsh marine environments such as vessels, offshore platforms, and wind farms. Typically pedestal-mounted with a compact structure, it is designed to maximize available deck space. The series includes telescopic boom, knuckle boom, and various other configurations to safely and efficiently handle cargo, equipment, subsea operations, and platform supply. This model offers a lifting capacity of 2 to 20 tons, with fully customizable work duty class, lifting height, and other parameters to meet diverse vessel and offshore operational needs. The crane is certified to CCS, CE, ABS, and BV international standards, ensuring safe and reliable performance in demanding offshore conditions.

TECHNICAL DATA

Parameter	Specification
Lifting Capacity	2 - 20 t (customizable)
Safe Working Load (SWL)	2 – 1,400+ tonnes
Lifting Height	25 – 150 m
Slewing Angle	360° (continuous)
Design Temperature	-35℃ ~ +45℃
Control Mode	Cab/Wireless remote control
Max. Working Wind Speed	20 m/s
Max. Non-Working Wind Speed	55 m/s

APPLICATION

Marine Salvage and Wreck Removal

Subsea Engineering and Construction

Deep-Sea Mining and Oceanography

Offshore Wind Energy (Renewables)

Coastal Infrastructure and Civil Engineering

Offshore Oil & Gas Exploration

FEATURES

Heavy Cargo and Supply Transfer Facilitates the seamless movement of heavy equipment, containers, and essential supplies between offshore platforms, drilling rigs, and supply vessels (OSVs), ensuring uninterrupted offshore logistics.

Subsea Deployment and Recovery Specifically engineered to deploy and retrieve subsea hardware, such as ROVs (Remotely Operated Vehicles), manifolds, and wellhead components, often utilizing Active Heave Compensation (AHC) to neutralize wave motion.

Offshore Infrastructure Installation Provides the critical lifting capacity required for the assembly and installation of offshore wind turbines, oil rig jackets, and pipeline modules, supporting complex marine construction and engineering projects.

Safe Personnel Handling Features specialized "man-riding" capabilities and advanced safety redundancy systems to safely transport personnel between vessels and offshore installations via certified transfer baskets.

Operational Stability in High Sea States Designed with advanced anti-sway and robust slewing systems to maintain high precision and safety standards during lifting operations, even in extreme maritime climates and turbulent weather conditions.

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Our products are mainly exported to South America, Southeast Asia,Africa, Russia, Turkey, Middle East countries and so on.