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Wire Rope Rigging Series

  • DAWSON/OEM

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Wire Rope Rigging Series
- Dawson Group Ltd. - China Manufacturer, Supplier, Factory

Wire Rope Sling Rigging Series - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
Wire Rope Rigging Series - Dawson Group Ltd. - China Manufacturer, Supplier, Factory       Wire Rope Rigging Series - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Wire rope sling is a kind of special rigging, its main components is wire rope, which is under deep processing and integrated with various connecting parts according to the requirements of lifting. It features in high load, good wear resistance, high tensile strength, long service life and accurate length etc. In addition, it requires not too much for environment. The processing methods for wire rope sling include: endless preparation, pouring, pressing and splice etc.
 
So far, the wire rope sling is widely applied in harbor, power, steel & iron, petroleum. Shipbuilding, aviation and aerospace etc. Dawson can provide wire rope sling of various specification with the diameter between 6mm and 360mm. Meanwhile, it can, according to the demand of the customers, design and produce the wire rope slings adaptable to various lifting environment and requirements in the shortest time. In addition, it can provide crane-dedicated wire ropes, non-rotating multi-strand wire ropes and series of bright work wire ropes and galvanized point-contact series wire ropes.
 
Wire Rope Sling By Pressing and Splice
 
Pressing for wire rope sling is an advanced manufacturing process for wire rope. As one of the most popular sling in the word, the pressed wire rope is of beautiful appearance, high accuracy, and high connection strength, the approximate efficacy index of its joint form is 20% higher than that of the spliced wire rope. Our pressed rope shackle is made of premium wire rope, conforming to GB6946-93 standard and obtained CCS ship inspection certification.
 
Sling Aluminum Sleeve - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Sling aluminum sleeve
Sling aluminum sleeve is made of seamless aluminum sleeve by the unique techniques of Dawson through special processing for the inside of the aluminum alloy sleeve. Using such sling aluminum sleeve of pressed wire rope sling produced through the unique processing can improve the quality of pressed wire rope products, even higher than the national standard. Due to its cheaper price and high cost effectiveness, pressed aluminum alloy wire rope sling is most widely applied in wire rope pressing field.
 
Sling Copper Sleeve - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
 
Sling copper sleeve
Acid resistant, alkali-resistant, salt-resistant and high-humidity-resistant, sling copper sleeve is applicable to strongly corrosion conditions such as deep sea.
 
Sling Steel Sleeve - Dawson Group Ltd. - China Manufacturer, Supplier, Factory

Sling steel sleeve
Sling steel sleeve is suit-able for the lifting job where the joint is under wear abrasion and under extrusion.

Label of Eligible ProductsSling Steel Sleeve - Dawson Group Ltd. - China Manufacturer, Supplier, Factory PA-Z Heavy Ring Sling Head - Dawson Group Ltd. - China Manufacturer, Supplier, Factory PA-T Common Ring Sling Head - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Label of eligible products PA-Z heavy ring sling head PA-T common ring sling head
Breaking Force Test Result - Dawson Group Ltd. - China Manufacturer, Supplier, Factory PA Press Sling Head - Dawson Group Ltd. - China Manufacturer, Supplier, Factory AS Splice Sling Head - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Breaking force test result
PA press sling head AS splice sling head
 
Wire Rope - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Wire Rope - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Wire Rope - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Wire Rope - Dawson Group Ltd. - China Manufacturer, Supplier, Factory




  Wire Rope Sling Application
Hitches
1. Vertical- The Vertical, or straight, attachment is simply using a sling to connect a lifting hook or other device to a load. Full rated load of the sling may be used, but never exceeded. A tagline should be used on such a lift to prevent rotation, which can damage the sling. A wire rope sling with a hand-tucked splice can unlay and fail if the sling is allowed to rotate.
2. Choker- Choker Hitch configurations reduce the rated capacity of a sling by 20 to 25 percent. If a load is hanging free, the normal choke angle is approximately 135°. When the choke angle is less than 120°, an adjustment in the choker rated capacity must be made(see illustration below). Extreme care should be taken to determine the choke angel as accurately as possible. As indicated in the table below, the decrease in rated capacity is dramatic.

   

Hitches - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
 
   Choker Hitch
RATED CAPACITY ADJUSTIMENT
Choke  IWRC and Fiber Core Rope
Angle       Percent of
(Degrees)    Choker Rated Capacity
Over 120        100
  90-120          87
  60-89            74
  30-59            62
Up to 29         49

Hitches - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
 
Angle Adjustment
Rated capacity adjustment for slings in choker hitch when angle is less than 120°. Choke angles greater than 135° are unstable and should not be used.
 
3. Basket- Basket hitched distribute a load equally between the two legs of a sling, within limitations imposed by the angles at which legs are rigged to the load(see discussion of sling angles).
Basket Hitch
CAPACITY ADJUSTMENT
    Angle                      Percent of Single Leg
(Degrees)                          Capacity
       90                                     200
       60                                     170
       45                                     140
       30                                     100

Basket Hitch - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
 
Angle
A basket hitch has twice the capacity of a sling leg only if legs of sling are vertical, and only if D/d ratio is 25:1 and it is vertical. D/d>25:1 per ANSI B30.9.

 

WARNING: Do not use, or allow the use of the products in this catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.

 

Reeving
Revving through connections to load increases load on connections fitting by as much as twice.
Do not reeve.

 

Reeving - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Triple and Quad Leg Slings
Triple leg slings have 50% more capacity than double leg only if the center of gravity is in center of connection points and the legs are adjusted properly(equal share of the load)
Quad leg slings offer improved stability but do not provide increased lifting capacity.

 

Triple and Quad Leg Slings - Dawson Group Ltd. - China Manufacturer, Supplier, Factory

 

Center of Gravity(COG)
The location of the center of gravity to the pick points is an important consideration.

 

Center of Gravity(COG) - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
COG and Sling Loading
When lifting vertically, the load will be shared equally if the center of gravity is spaced equally between the pick points, as in the first illustration at right. If the weight of the load is 10,000 lbs., then each sling will have a load of 5,000 lbs. and each shackle and eyebolt will also have a load of 5,000 lbs.
When the center of gravity is not equally spaced between the pick points, as in the second illustration, the slings and fittings will not carry an equal share of the load. The sling connected to the pick point closest to the center of gravity will carry the greatest share of the load. Sling 2 is closest to COG. It will have the greatest share of load.
Sling 2 = 10,000 × 8 /(8+2)= 8,000
Sling 1 = 10,000 × 2 /(8+2)= 2,000

 

COG and Sling Loading - Dawson Group Ltd. - China Manufacturer, Supplier, Factory

 

WARNING: Do not use, or allow the use of the products in the catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.

   

Sling Angle
Sling angle (also called angle of loading) is the angle measured between a horizontal plane and the sling leg or body. This angle is very important and can have a dramatic effect on the rated capacity of the sling (see illustration below) . As illustrated at right, when this angle decreases, the load on each leg increases. This principle applies whether one sling is used to pull at an angle, in a basket hitch, or for multilegged bridge slings. Sling angles of less than 30° shall not be used.

Angles and Load
Angles and Load - Dawson Group Ltd. - China Manufacturer, Supplier, Factory Sling Angles - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
Angles and Stress
How do you carry two buckets of water? These illustrations typify the stresses imposed on slings when the legs are attached to the load at various angles.

 

Sling Angles - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter

 

             Load Angle Factor
Sling Angle                   Load Angle
Degrees(A°)                 Factor =L/H
   90                              1.00
   60                             1.155
   50                             1.305
   45                             1.414
   30                             2.00
 LOAD ON EACH LEG OF SLING=
(Load/2)×LOAD ANGLE FACTOR
ANSI B30.9 recommends against the use of a horizontal sling angle smaller than 30°.
Sling Angles - Dawson Group Ltd. - China Manufacturer, Supplier, Factory       Sling Angles - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
WARNING: Do not use, or allow the use of the products in the catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.

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Factory of Wire Rope Rigging Series - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Package of Wire Rope Rigging Series - Dawson Group Ltd. - China Manufacturer, Supplier, Factory

 

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