Marine Lifting Equipment --- Types, Use, and Management of Marine Cranes

一、 Main Types and Characteristics of Marine Cranes

1. Deck Cranes

- Common Types: Electric-hydraulic and wire-rope luffing types, typically with a lifting capacity of 5-50 tons, covering the needs of most cargo and engineering vessels.

- Advantages: 360° rotation, small deck footprint, suitable for frequent loading and unloading operations.

2. Mast Crane

- Traditional structure, using a mast and rope combination for lifting, with a lifting capacity of up to 200 tons (such as on large semi-submersible vessels).

- Suitable for: Lifting heavy equipment, but with limited operational flexibility.

3. Hydraulic Knuckle Boom Crane

- Folding design, with a working radius of 3-30 meters, suitable for fishing vessels or supply vessels with limited space.

- Technical Highlights: Equipped with a torque limiter for enhanced safety. 4. Special Lifting Equipment

4. This includes container lifts (standard 20/40 foot adaptability) and deep-sea operation A-frames (supporting ROV retraction and deployment). These must be customized based on the vessel's capabilities. of 7% or more, or a localized reduction of 10% or more accompanied by corrosion.

二、 Equipment Selection and Usage Specifications

1. Key Selection Parameters

- Lifting capacity, working radius, and foundation strength (must meet vessel stability calculation requirements);

- Environmental adaptability: such as salt spray protection level and wind resistance level (≥12).

2. Operational Procedures

- Pre-operation Inspection: Wire rope wear ≤ 10%;

- Dynamic Test: No-load operation + 110% rated load test.

三、Safety Management and Maintenance Key Points

1. Risk Control

- Personnel Training: Certified personnel only;

- Emergency Plan: Emergency braking response time ≤ 2 seconds in the event of uncontrolled lifting.

2. Maintenance Cycle

- Daily Maintenance: Lubricate key components (once a week);

- Overhaul Cycle: Complete disassembly and inspection every 5 years.