D-Type Fenders vs. Square Fenders

D-Type Fenders vs. Square Fenders: Differences in Structure, Performance, and Application

1. Appearance Design
   • D-Type Fender: The shape is “D” shaped, with a semi-circular cross-section resembling the letter “D.” This design gives the outer side a large curved surface, which effectively disperses the impact force between the ship and the dock or between ships.
   • Square Fender: The shape is rectangular, with a square or near-square cross-section. The sharp right-angle corners result in a larger contact area between the fender and the dock or other ships.
2. Shock Absorption Performance
   • D-Type Fender: Due to its curved design, it can better absorb impact forces and reduce the force of the ship’s collision with the dock, offering superior shock absorption performance.
   • Square Fender: The right-angled edges make it more difficult to disperse pressure upon impact, potentially causing a stronger reaction force that could damage the ship, resulting in relatively poorer shock absorption performance.
3. Applicability
   • D-Type Fender: Suitable for environments where higher shock resistance is required, especially in situations where frequent collisions between ships and docks, or ships and other ships, occur. For example, it is commonly used in dockside berths and dry docks.
   • Square Fender: Due to its simple structure, it is widely used in general port docks and cargo ships, especially in cost-sensitive scenarios.
4. Cost
   • D-Type Fender: Due to its more complex design and higher material consumption, it has a higher production cost.
   • Square Fender: The manufacturing process is simple, making it more cost-effective.
5. Installation
   • D-Type Fender: Requires precise alignment during installation, particularly in terms of the angle and position when the ship is docked, making installation more complex.
   • Square Fender: With its simple structure, installation is relatively easier, and it has a broader range of applications.
6. Durability
   • D-Type Fender: Its design, which effectively absorbs impact, generally results in a longer service life.
   • Square Fender: Due to its relatively rigid structure, long-term use may lead to wear, making its durability somewhat inferior to that of D-type fenders.
7. Appearance and Aesthetics
   • D-Type Fender: Its smooth, streamlined shape tends to be more aesthetically pleasing.
   • Square Fender: Its rectangular shape is simple and unadorned, which might not have the same visual appeal as the D-type.

Summary:

• D-Type Fender: Suitable for scenarios requiring high impact absorption and durability, effectively disperses impact forces, has strong adaptability, but comes with higher costs and installation complexity.
• Square Fender: Ideal for cost-sensitive environments like general docks, with simpler manufacturing and installation, but weaker shock absorption and slightly lower durability compared to the D-type.