A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
The basic hoist has two important characteristics to define it: Lifting medium and power type. The lifting medium is either wire rope, wrapped around a drum, or load-chain, raised by a pulley with a special profile to engage the chain. The power can be provided by different means. Common means are hydraulics, electrical and air driven motors. Both the wire rope hoist and chain hoist have been in common use since the 1800s, however mass production of an Electric Hoist did not start until the early 1900s and was first adapted by Germany. A hoist can be built as one integral-package unit, designed for cost-effective purchasing and moderate use, or it can be built as a built-up custom unit, designed for durability and performance. The built-up hoist will be much more expensive, but will also be easier to repair and more durable. Package units were once regarded as being designed for light to moderate usage, but since the 60s this has changed. Built-up units are designed for heavy to severe service, but over the years that market has decreased in size since the advent of the more durable packaged hoist. A machine shop or fabricating shop will use an integral-package hoist, while a Steel Mill or NASA would use a built-up unit to meet durability, performance, and repairability requirements. NASA has also seen a change in the use of package hoists. The NASA Astronaut training pool, for example, utilizes cranes with packaged hoists.
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Core attributes
Pneumatic rubber fenders have any advantages including:
*Easy and fast to deploy;
*Very low reaction and hull pressure;
*Performance adjustable by varying initial pressure;
*Suitable for areas with large or small tides;
*Maintains large clearances between hull and structure;
*Optional chain-tyre nets for heavy duty applications;
*Low maintenance.
Application
Pneumatic yokohama rubber fenders are suitable for many applications including:
*Tankers, Gas Carriers and Bulk Cargo Ships;
*Fast ferries and aluminum hulled vessels;
*Temporary of permanent installations;
*Rapid response and emergency fendering;
*As stand-off fenders to realign ships with shore facilities. Pneumatic Fender Technical Performance TableÂ
Specifications (mm)
At 60% compression;
initial pressure is 0.05MPaWeight of sphere
±10%
Diameter
Length
Energy Absorption
(KJ)Reaction Force
(KN)KG
200
500
Â
Â
Â
300
500
Â
Â
Â
500
1000
6
64
25
600
1200
10
86
35
700
1500
17
137
50
1000
1500
32
181
80
1000
2000
45
257
100
1200
2000
63
297
120
1350
2500
100
426
170
1500
3000
153
579
320
1700
3000
190
637
400
2000
3500
308
875
590
2500
4000
663
1380
1000
2500
5500
932
2010
1400
3000
5000
1050
2030
1800
3000
6000
1315
2488
2200
3300
6500
1814
3015
2700
3500
6000
2018
3286
2800
3500
6500
2325
3656
3200
3500
7000
2650
4018
3600
3600
7200
3180
4821
4320
Engine: No Engine
Engine Type: No Engine
Usage: for Ship
Certification: CCS
Trademark: Yutung
Transport Package: Nude Pack
Specification: As Per Your Requirement
Origin: China
HS Code: 8907900090
Pneumatic fenders, a kind of marine fender, also called yokohama rubber fender, is a leading anti-collision device for marine application in the world today. This compressed air rubber fender is used as a protective medium. Therefore, pneumatic rubber fenders serves as a protective medium against collision when ship-to-ship contact (STS) and ship-to-berthing (STB). Pneumatic fenders has the advantages of massive energy absorption with low unit surface pressure acted upon the ship. So penumatic fenders has become an ideal ship protection medium used extensively by large tankers, LPG vessels, ocean platforms, large docks, harbor and wharfs.