Marine Wire Rope

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The Components Of Marine Wire Rope

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 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
Ship handling	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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