Industry News
Advantages and Disadvantages of Fender Types |
Author : Date : 10/19/2016 1:30:05 AM |
1. Hollow cylindrical (diametrically loaded) fenders a) Advantages: 1) economical; 2) easy to install or replace individual units; 3) may be mounted to give cover over a large vertical range. b) Disadvantages: 1) susceptible to damage by surging motion of vessel; 2) long length necessary to spread reactive force; 3) larger than other elastomeric units to absorb same energy. 2. Cylindrical floating (diametrically loaded) fenders a) Advantages: 1) economical; 2) one unit covers full tide range. b) Disadvantages: 1) susceptible to damage by surging motion of vessel; 2) no resistance to vessel surge; 3) can roll up face of berth unless restrained. 3. V-shaped fenders a) Advantages: 1) easy to install or replace individual units; 2) low reaction and high energy absorption with constant reaction over part of deflection range. b) Disadvantage: 1) only cover a small tidal range unless upper and lower rows of fenders provided. 4. Buckling column fenders a) Advantages: 1) easy to install or replace individual units; 2) low reaction and high energy absorption with constant reaction over part of the deflection range. b) Disadvantages: 1) has to be used with fender frame; 2) may require horizontal chains to resist longitudinal friction force. 5. Rectangular or square section solid strips and D bore fenders a) Advantage: 1) simple design, easy to install and replace. b) Disadvantages: 1) generally low energy capacity; 2) long length necessary to spread reactive force. 6. Fender piles a) Advantage: 1) if closely spaced they provide good protection for berths in large tidal ranges, especially where small vessels are to be accommodated. b) Disadvantages: 1) require suitable geotechnical conditions; 2) replacement of damaged piles in front of berth usually necessitates temporary restrictions on berth usage. 7. Floating pneumatic fenders a) Advantages: 1) large energy capacity; 2) low reactive force; 3) can adapt to curved hull surfaces and angled berthing; 4) full tidal range can be covered with single unit; 5) simple to install and remove; units can be moved from berth to berth as need arises. b) Disadvantages: 1) large diameter keeps vessel further from the cope than other types which leads to: i) greater first costs for container cranes, shiploaders and similar equipment; ii) heavier bogie loads for container cranes, shiploaders and similar equipment; iii) increased operation cycle times for container cranes, shiploaders and similar equipment; 2) require large beating area that may have to extend above general level of berth deck; 3) can roll up face of berth if not suitably restrained; 4) require secondary protection against tearing and puncturing by protrusions from ship’s hull. 8. Foam filled floating fenders a) Advantages: 1) large energy capacity; 2) low reactive force; 3) can adapt to curved hull surfaces and angled berthing; 4) full tidal range can be covered with a single unit; 5) simple to install and remove; units can be moved from berth to berth as the need arises; 6) will not sink immediately or collapse, if punctured. b) Disadvantages: 1) large diameter keeps vessels further from the cope than most other types; 2) require large bearing area that may have to extend above general level of berth deck; 3) can roll up face if not suitably restrained. 9. Fixed pneumatic fenders a) Advantages: 1) large energy capacity; 2) low reactive force; 3) little loss of efficiency with angled berthing and adapts to curved hull surface; 4) easy to install and replace; 5) several fenders may be coupled to common fender frame to give larger capacity unit. b) Disadvantages: 1) require a protective cap to reduce friction with ship’s hull; 2) can be torn or punctured by protrusions from ship’s hull. |
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