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Marine Wire Rope

Steel Wire Rope For Marine Rigging

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The Components Of Marine Wire Rope

wire rope components 01

Marine wire rope consists of three essential components that contribute to its design and functionality:

Wire

Marine wires form individual strands within the wire rope. They are typically made from various metals such as steel, iron, stainless steel, monel, or bronze. The choice of marine wire material determines properties such as strength, wear resistance, fatigue resistance, corrosion resistance, and flexibility. Wires can be coated or have a bright, uncoated finish.

Strand

Multiple wires are twisted together to create strands within the wire rope. These strands are arranged in a helical pattern around the core of the rope. Strands made of larger diameter wires offer greater abrasion resistance, while strands made of smaller diameter wires provide enhanced flexibility.

Marine steel wire rope is available in several configurations, including 6 strands, 8 strands, 19 strands, 35 strands, and 37 strands. However, the most commonly employed configuration is the 6-strand wire rope, particularly prevalent in ship loading and unloading tasks. The 35-strand wire rope is considered of higher quality, albeit at a relatively higher cost.

Core

The core of a marine steel wire rope refers to the central part of the rope around which the strands are laid. 

Types Of Wire Rope Core

Wire rope cores can be classified into the following types:

FC - Fiber Core

A fiber core is made of natural or synthetic polypropylene fibers. Fiber cores offer higher elasticity compared to steel cores. However, they are more prone to crushing and are not recommended for use in high-temperature environments.

IWRC - Independent Wire Rope Core

An independent wire rope core consists of a separate wire rope within the center of the main wire rope. IWRC cores provide additional strength and support to the wire rope. They are suitable for applications where a fiber core may not offer sufficient support or in environments with high operating temperatures.

WSC - Wire Strand Core

A wire strand core refers to an individual strand within the wire rope acting as the core. This strand can be made of the same material as the outer strands or a different material to provide specific characteristics. WSC cores are utilized when a fiber core or IWRC is not required, and they offer a balance between strength and flexibility.

Fiber Core VS Steel Core Wire Rope

Fiber Core Wire Rope

  • Advantages: Fiber core wire rope offers high flexibility, good fatigue life, and a high strength-to-weight ratio, which can be beneficial in marine applications where flexibility and weight are important factors.

  • Applications: This marine grade ropes are commonly used in marine applications such as holding and closing grab crane ropes, rigging, lifeboat falls, and towing and luffing ropes.

  • Disadvantages: Fiber core wire ropes have lower crush resistance and lower strength compared to steel core wire ropes. They are not suitable for high-heat environments or areas with open flames.

Steel Core Wire Rope

  • Advantages: Steel core wire ropes provide high strength and crush resistance, making them suitable for heavy-duty marine applications. They offer durability and can withstand harsh conditions, including marine environments.

  • Applications: Steel core wire ropes are commonly used in mooring, cranes, marine industry operations, and transportation.

  • Disadvantages: Steel core wire ropes have lower flexibility and poor resistance to bending deformation, which can be a limitation in marine applications where flexibility and bending are required.

Wire Rope Construction

wire rope construction 1

Wire rope construction involves the arrangement of wires and layers within the rope. Different patterns are used to achieve specific characteristics and performance. Here are the descriptions of the wire rope construction patterns you mentioned:

  • Single Layer: This pattern is the most common and consists of a single-wire center surrounded by six wires of the same diameter. It forms a 7-wire strand.

  • Filler Wire: In this pattern, two layers of uniform-size wires are wrapped around a center. The inner layer has half the number of wires compared to the outer layer. Small filler wires are laid in the valleys of the inner layer, equal to the number of wires in the inner layer.

  • Seale: The Seale pattern consists of two layers of wires around a center, with equal wire counts in each layer. All wires within a layer have the same diameter, and the larger outer wires rest in the valleys between the smaller inner wires.

  • Warrington: In this pattern, two layers of wires are wrapped around a center. The inner layer consists of one diameter of wire, while the outer layer alternates between large and small diameters. The larger outer-layer wires rest in the valleys, while the smaller ones rest on the crowns of the inner layer.

  • Combination: A combination strand is constructed by using a combination of two or more of the patterns mentioned above. This allows for customization and tailoring of the wire rope’s properties to specific requirements.

Wire Rope Recommendations for Various Marine Applications

When it comes to various marine applications such as ship handling, rigging, tugs, cargo nets, floating timber, ships stretching masts and suspension bridges, wreck raising, and fishing trawls, it is crucial to select the appropriate wire ropes.

 

Marine Grade Wire Rope Specifications

Marine Application

Wire Rope Type

Wire Rope Model

Ship handling

Wire contact wire rope

6×24S 6×24W 6×19S 6×19W 6×25Fi 6×29Fi6×31Fi 6×36SW 6×37S

Point contact wire rope

6×19 6×37

Tugs, cargo nets, floating timber

Wire Rope

6×24 6×24S 6×24W6×37 6×31SW 6×36SW 6×37S

Ships stretch masts and suspension Bridges

Wire Rope

6×7+IWS 6×19+WS 6×19+IWR

Wreck raising

Wire Rope

6×37 6x37S 6x36Sw 6x41Sw 6x49SwS 6x31Sw8x19S 8x19W 8x31SW 8x36SW 8x41SW 8x49SWS

Fishing trawl

Wire Rope

6×24 6×24S 6×24W 6×19 6×19S 6×19W6×31SW 6×36SW 6×37 6×37S

Marine Wire Rope Size Chart

Nominal Diameter

Approx Weight

Min Breaking Load Of Wire Rope/KN

mm

Kg/100m

1670 Mpa

1770 Mpa

1870 Mpa

1960 Mpa

D

FC

IWR

FC

IWR

FC

IWR

FC

IWR

FC

IWR

5

8.65

10

12.3

13.3

13.1

14.1

13.8

14.9

14.5

15.6

7

17

19.6

24.1

26.1

25.6

27.7

27

29.2

28.3

30.6

15

77.9

90

111

120

118

127

124

134

130

141

26

234

270

333

360

353

382

373

403

391

423

38

500

578

711

769

754

815

797

861

835

903

46

732

846

1040

1130

1100

1190

1170

1260

1220

1320

58

1160

1350

1660

1790

1760

1900

1860

2010

1950

2100

66

1510

1740

2150

2320

2270

2460

2400

2600

2520

2720

78

2110

2430

3000

3240

3180

3440

3360

3630

3520

3800

90

2800

3240

3990

4320

4230

4570

4470

4830

4680

5060

110

4190

4840

5960

6450

6320

6830

6680

7220

7000

7570

120

4980

5760

7090

7670

7520

8130

7940

8590

8330

9000

Nominal Diameter

Approx. Weight

Min Breaking Load Of Wire Rope/KN

mm

kg/100m

1670 Mpa

1770 Mpa

1870 Mpa

1960 Mpa

D

FC

IWR

FC

IWR

FC

IWR

FC

IWR

FC

IWR

8

24.3

26.8

35.3

38.0

37.4

40.3

39.5

42.6

41.4

44.7

16

97.3

107

141

152

150

161

158

170

166

179

24

219

241

317

342

336

363

355

383

373

402

38

549

604

796

858

843

910

891

961

934

1008

46

804

884

1170

1260

1240

1330

1310

1410

1370

1480

54

1110

1220

1610

1730

1700

1840

1800

1940

1890

2030

60

1370

1500

1980

2140

2100

2270

2220

2400

2330

2510

74

2080

2290

3020

3260

3200

3450

3380

3650

3540

3820

85

2750

3020

3980

4300

4220

4550

4460

4810

4670

5040

100

3800

4180

5510

5950

5840

6300

6170

6660

6470

6980

110

4600

5060

6670

7190

7070

7620

7470

8060

7830

8440

120

5470

6020

7940

8560

8410

9070

8890

9590

9310

10000

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