overhead crane wire rope lubricant factory

Wire rope forms an important part of many machines and structures. It is comprised of continuous wire strands wound around a central core. There are many kinds of wire rope designed for different applications. Most of them are steel wires made into strands wound with each other. The core can be made of steel, rope or even plastics.

Wire ropes (cables) are identified by several parameters including size, grade of steel used, whether or not it is preformed, by its lay, the number of strands and the number of wires in each strand.

A typical strand and wire designation is 6x19. This denotes a rope made up of six strands with 19 wires in each strand. Different strand sizes and arrangements allow for varying degrees of rope flexibility and resistance to crushing and abrasion. Small wires are better suited to being bent sharply over small sheaves (pulleys). Large outer wires are preferred when the cable will be rubbed or dragged through abrasives.

There are three types of cores. An independent wire rope core (IWRC) is normally a 6x7 wire rope with a 1x7 wire strand core resulting in a 7x7 wire rope. IWRCs have a higher tensile and bending breaking strength than a fiber core rope and a high resistance to crushing and deformation.

A wire strand core (WSC) rope has a single wire strand as its core instead of a multistrand wire rope core. WSC ropes are high strength and are mostly used as static or standing ropes.

Wire ropes also have fiber cores. Fiber core ropes were traditionally made with sisal rope, but may also use plastic materials. The fiber core ropes have less strength than steel core ropes. Fiber core ropes are quite flexible and are used in many overhead crane applications.

The lay of a wire rope is the direction that the wire strands and the strands in the cable twist. There are four common lays: right lay, left lay, regular lay and lang lay. In a right lay rope the strands twist to the right as it winds away from the observer. A left lay twists to the left. A regular lay rope has the wires in the strands twisted in the opposite direction from the strands of the cable. In a lang lay rope, the twist of the strands and the wires in the strands are both twisted the same way. Lang lay ropes are said to have better fatigue resistance due to the flatter exposure of the wires.

Wire ropes are made mostly from high carbon steel for strength, versatility, resilience and availability and for cost consideration. Wire ropes can be uncoated or galvanized. Several grades of steel are used and are described in Table 1.

Steel cable wire is stiff and springy. In nonpreformed rope construction, broken or cut wires will straighten and stick out of the rope as a burr, posing a safety hazard. A preformed cable is made of wires that are shaped so that they lie naturally in their position in the strand, preventing the wires from protruding and potentially causing injury. Preformed wire ropes also have better fatigue resistance than nonpreformed ropes and are ideal for working over small sheaves and around sharp angles.

Lubricating wire ropes is a difficult proposition, regardless of the construction and composition. Ropes with fiber cores are somewhat easier to lubricate than those made exclusively from steel materials. For this reason, it is important to carefully consider the issue of field relubrication when selecting rope for an application.

There are two types of wire rope lubricants, penetrating and coating. Penetrating lubricants contain a petroleum solvent that carries the lubricant into the core of the wire rope then evaporates, leaving behind a heavy lubricating film to protect and lubricate each strand (Figure 2). Coating lubricants penetrate slightly, sealing the outside of the cable from moisture and reducing wear and fretting corrosion from contact with external bodies.

Both types of wire rope lubricants are used. But because most wire ropes fail from the inside, it is important to make sure that the center core receives sufficient lubricant. A combination approach in which a penetrating lubricant is used to saturate the core, followed with a coating to seal and protect the outer surface, is recommended. Wire rope lubricants can be petrolatum, asphaltic, grease, petroleum oils or vegetable oil-based (Figure 3).

Petrolatum compounds, with the proper additives, provide excellent corrosion and water resistance. In addition, petrolatum compounds are translucent, allowing the technician to perform visible inspection. Petrolatum lubricants can drip off at higher temperatures but maintain their consistency well under cold temperature conditions.

Various types of greases are used for wire rope lubrication. These are the coating types that penetrate partially but usually do not saturate the rope core. Common grease thickeners include sodium, lithium, lithium complex and aluminum complex soaps. Greases used for this application generally have a soft semifluid consistency. They coat and achieve partial penetration if applied with pressure lubricators.

Petroleum and vegetable oils penetrate best and are the easiest to apply because proper additive design of these penetrating types gives them excellent wear and corrosion resistance. The fluid property of oil type lubricants helps to wash the rope to remove abrasive external contaminants.

Wire ropes are lubricated during the manufacturing process. If the rope has a fiber core center, the fiber will be lubricated with a mineral oil or petrolatum type lubricant. The core will absorb the lubricant and function as a reservoir for prolonged lubrication while in service.

If the rope has a steel core, the lubricant (both oil and grease type) is pumped in a stream just ahead of the die that twists the wires into a strand. This allows complete coverage of all wires.

After the cable is put into service, relubrication is required due to loss of the original lubricant from loading, bending and stretching of the cable. The fiber core cables dry out over time due to heat from evaporation, and often absorb moisture. Field relubrication is necessary to minimize corrosion, protect and preserve the rope core and wires, and thus extend the service life of the wire rope.

If a cable is dirty or has accumulated layers of hardened lubricant or other contaminants, it must be cleaned with a wire brush and petroleum solvent, compressed air or steam cleaner before relubrication. The wire rope must then be dried and lubricated immediately to prevent rusting. Field lubricants can be applied by spray, brush, dip, drip or pressure boot. Lubricants are best applied at a drum or sheave where the rope strands have a tendency to separate slightly due to bending to facilitate maximum penetration to the core. If a pressure boot application is used, the lubricant is applied to the rope under slight tension in a straight condition. Excessive lubricant application should be avoided to prevent safety hazards.

Some key performance attributes to look for in a wire rope lubricant are wear resistance and corrosion prevention. Some useful performance benchmarks include high four-ball EP test values, such as a weld point (ASTM D2783) of above 350 kg and a load wear index of above 50. For corrosion protection, look for wire rope lubricants with salt spray (ASTM B117) resistance values above 60 hours and humidity cabinet (ASTM D1748) values of more than 60 days. Most manufacturers provide this type of data on product data sheets.

Cable life cycle and performance are influenced by several factors, including type of operation, care and environment. Cables can be damaged by worn sheaves, improper winding and splicing practices, and improper storage. High stress loading, shock loading, jerking heavy loads or rapid acceleration or deceleration (speed of the cable stopping and starting) will accelerate the wear rate.

Corrosion can cause shortened rope life due to metal loss, pitting and stress risers from pitting. If a machine is to be shut down for an extended period, the cables should be removed, cleaned, lubricated and properly stored. In service, corrosion and oxidation are caused by fumes, acids, salt brines, sulfur, gases, salt air, humidity and are accelerated by elevated temperatures. Proper and adequate lubricant application in the field can reduce corrosive attack of the cable.

Abrasive wear occurs on the inside and outside of wire ropes. Individual strands inside the rope move and rub against one another during normal operation, creating internal two-body abrasive wear. The outside of the cable accumulates dirt and contaminants from sheaves and drums. This causes three-body abrasive wear, which erodes the outer wires and strands. Abrasive wear usually reduces rope diameter and can result in core failure and internal wire breakage. Penetrating wire rope lubricants reduce abrasive wear inside the rope and also wash off the external surfaces to remove contaminants and dirt.

Many types of machines and structures use wire ropes, including draglines, cranes, elevators, shovels, drilling rigs, suspension bridges and cable-stayed towers. Each application has specific needs for the type and size of wire rope required. All wire ropes, regardless of the application, will perform at a higher level, last longer and provide greater user benefits when properly maintained.

Lubrication Engineers, Inc. has found through years of field experience, that longer wire rope life can be obtained through the use of penetrating lubricants, either alone or when used in conjunction with a coating lubricant. Practical experience at a South African mine suggests that life cycles may be doubled with this approach. At one mine site, the replacement rate for four 44-mm ropes was extended from an average 18.5 months to 43 months. At another mine, life cycles of four 43-mm x 2073 meter ropes were extended from an average 8 months to 12 months.

In another study involving 5-ton and 10-ton overhead cranes in the United States that used 3/8-inch and 5/8-inch diameter ropes, the average life of the ropes was doubled. The authors attribute this increased performance to the ability of the penetrating lubricant to displace water and contaminants while replacing them with oil, which reduces the wear and corrosion occurring throughout the rope. A good spray with penetrating wire rope lubricant effectively acts as an oil change for wire ropes.

In these examples, the savings in wire rope replacement costs (downtime, labor and capital costs) were substantial and dwarfed the cost of the lubricants. Companies who have realized the importance of proper wire rope lubrication have gained a huge advantage over those who purchase the lowest priced lubricant, or no lubricant at all, while replacing ropes on a much more frequent basis.

Proper lubrication of your wire rope, chain and cable can safely extend its operational life regardless of application. Cranes, elevators, shovels, drilling rigs, suspension bridges and draglines are some of the many applications that use wire rope, chain or cable to perform work such as pulling, dragging or hoisting. These applications often are exposed to harsh environmental conditions, including extreme weather. Lubrication Engineers can help your wire rope, chain and cable last longer and operate safely by implementing a lubricant reliability program and recommending the right lubricants for the job.

Most wire ropes are lubricated during the manufacturing process, but this lubricant will not last the entire life of the rope. When looking for a lubricant to relubricate your wire rope, choose one that contains no acids or alkalis, possesses the adhesive strength to stay on the rope, can penetrate between wires and strands, has high fluid film strength, resists oxidation and remains pliable. It is important to remember that most wire ropes fail from the inside out. Corroded rope can be a safety hazard, as there is no way to determine its remaining strength and life. Proper lubrication will help prevent deterioration of wire rope due to rust and corrosion.

Because most wire ropes fail from the inside, it is critical to ensure the center core receives sufficient lubricant. LE recommends a combined regimen in which a penetrating lubricant is used to saturate the core, followed by a coating lubricant to seal and protect the outer surface. LE offers several penetrating and coating type wire rope lubricants to suit your specific needs.

Penetrating lubricants contain an evaporative solvent that facilitates migration of the lubricant into the core of the wire rope, then evaporates, leaving behind a heavy lubricating film that protects and lubricates each strand.

Wirelife Almasol Coating Grease (451-453) is a soft, semifluid calcium-based grease designed to coat wire rope as well as moving chain and cable parts to ensure long life and smooth, quiet operation. Its tacky, water-resistant characteristics enable it to adhere strongly to rapidly moving parts, seal out damaging moisture, protect against premature wear and shield metal against corrosive attack.

Typical Applications: Wire rope, chain links, pins, bushings, cable sheave bushings, cables, open and closed silent and roller chains, and small, slow-turning gearboxes that require a semifluid lubricant

Wirelife Almasol Coating Lubricant (2002) is a fluid wire rope lubricant that provides a tough outer coating to seal and protect against fretting corrosion, wear and rust – even under extreme load and moisture. It seals and protects better than any product available. When used in conjunction with Wirelife Monolec Penetrating Lubricant, maximum protection and wear reduction is achieved.

Typical Applications: Mining and construction applications such as standing and running lines, draglines, cranes and derricks; marine applications such as cranes, hoists and drilling rigs; as a rust preventative for any metal in harsh environments and for metal parts in long-term storage.

Wirelife Almasol Syn Coating Lubricant (2022) is an extremely tacky, nonasphaltic synthetic lubricant with exceptionally high film strength. Perfect for extreme environments and conditions, it is the ultimate outer surface protector for wire rope and cable and comes from the same advanced technology that LE developed to protect large open gears in the mining and quarry industries. It derives its high load-carrying capacity from its synergistic blend of an extreme pressure additive and Almasol, LE’s exclusive wear-reducing additive.

Typical Applications: Mining and construction applications such as standing and running lines, draglines, cranes and derricks; marine applications such as cranes, hoists and drilling rigs.

Wirelife Monolec Penetrating Lubricant (2001) has excellent corrosion resistance and high load-carrying (EP) properties. It penetrates to the core of wire ropes, whether they are running or stationary. It is also excellent as a penetrating lubricant for chains of all sizes and works well in a variety of other industrial applications. When used in conjunction with Wirelife Almasol Coating Lubricant, maximum protection and wear reduction is achieved.

It contains a petroleum solvent to enhance its ability to penetrate. The solvent evaporates, leaving behind a film of heavy-bodied lubricant that protects and lubricates each strand and resists leakage from the wire rope core. Available in bulk sizes or in an aerosol version.

Typical Applications: All stationary or moving wire ropes or cables under heavy loads; chains of all sizes; mining and construction applications such as standing and running lines, draglines, cranes and derricks; marine applications such as cranes, hoists and drilling rigs; any other application that requires excellent rust protection for steel parts.

Designed for marine environments and other applications where environmental concerns require the use of a very low toxicity wire rope and chain lubricant, LE’s Wirelife Low Tox Penetrating Lubricant (2011) has excellent load-carrying capability and provides outstanding protection against rust, while having the lowest possible toxic effect on the environment.

Earthwise EAL Wire Rope Grease (3353) is recommended for use in applications on or near the waterways. It is an EAL and meets the specifications required by the EPA’s Vessel General Permit (VGP). It is readily biodegradable, exhibits minimal aquatic toxicity and will not accumulate in the cells of fish and other aquatic life forms. It is a soft, semifluid formulation designed to coat wire rope as well as moving chain and cable parts to ensure long life and smooth, quiet operation. Its semi-tacky, water-resistant characteristics enable it to adhere to the application and seal out damaging moisture and protect against rust formation.

Typical Applications: Applications near or around waterways including: Wire rope; chain links, pins and bushings; cable sheave bushings, bearings and strands; open and closed silent and roller chains. Ideal for use in automatic lubrication systems.

LE is happy to offer industrial lubricant and reliability recommendations for a variety of applications, and to provide product-specific data on all of our items to help you make the right decision. To learn more about our wire rope lubricants, wire rope lubricators as well as our other enhanced lubricants and lubricant reliability products, please

Crosby’s Vitalife®products are the preferred wire rope lubricants in the industry because of their ability to penetrate into wire rope and displace water and contaminants, thus reducing wear and corrosion throughout the rope.Available in a variety of container sizes.

Whitmore’s Wire Rope Lubricant products also coat these strands to prevent friction and wear. This results in longer wire rope life, less downtime for rope changes and more production.

Whitmore’s Wire Rope Lubricant is easily pumpable at temperatures down to -25°F (-35°C). Its nondrying film remains flexible in the most extreme weather conditions, which eliminates flaking and peeling.Whitmore’s Wire Rope Lubricant can be used to lubricate all sizes of wire rope, as well as chains, leaf springs and other applications where penetrating oil is needed. It may be applied by hand or automatic lube system.

Wire ropes are integral components for many buildings, machines, and structures. This material is comprised of contiguous wire strands that are wrapped around a centralized core. It is important to lubricate wire ropes in order to limit friction and prevent corrosion.

There are two main types of wire rope lubricants: penetrating and coating. A penetrating lubricant contains a solvent that transports the lubricant into the core of the wire. Once on the core, it evaporates and leaves behind a heavy, lubricating film that is capable of protecting each strand. A coating lubricant penetrates the wire slightly, and protects the outside of the cable from moisture, wear, fretting and corrosion.

Both of these lubrications are used on wire ropes, but since most failures come from the inside of the wire rope, it is most important to thoroughly saturate the core with lubrication.

Most lubricators are a made up of a mixture between petroleum and other compounds. The petroleum provides excellent corrosion and water resistance, which helps to extend the life of the wire. In addition to petroleum lubricants, grease and vegetable oils are also uses to coat the wires. These mixtures penetrate the core and are easily applied. Most cables are lubricated before they are used, but it is important to re-lubricated wires habitually.

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In order to fully understand the importance of the regular application for wire rope lubrication during the working life of stranded or full locked coil hoisting ropes, it is first necessary to analyze the functionof any such lubricant.

a) Each wire in any wire rope construction must remain as free as possible from adjacent wires so it can move to accommodate its allocated share of the varying rope tension it has to endure. This is especially important when the rope is performing at high speed and/or under the high wire contactstresses encountered during hoisting. Rope design is intended to minimize inter wire frictional contact but only by good lubricating practices can this effect be fully accomplished.

b) The majority of hoist ropes utilized in shafts are subject to corrosion from one cause or another. Shaft water containing a high salt content, chemical fumes, and upcast shafts producing condensation, are among the more notable causes. Regardless of the cause, it is essential toguard against or retard the certainty of corrosive attack on the steel. Experience has shown that the application of galvanized wire is only partially successful because the finish soon wears off.Therefore, it is clear that in-service lubricants must possess the following qualities:

It should be pointed out that in the case of full locked coil and many plastic enhanced hoisting ropes, in-service lubricant is confined solely to the outside wire. This is because the inner rope is already sealed off with adequate lubrication.

3) Strand displacement, loose wires, and rope waving, leading to loss of cross section stability. Additionally, the correct lubricant is of key importance during rope manufacture. Through a German study (see chart below), it is proven that the proper lay-up lubricant can have a great effect on rope life.

There are several critical components of an overhead crane, but the wire rope is probably at the top of the list. Should the rope break due to wear or corrosion, a load can be lost, resulting in serious damage and possibly injury or death to workers. That is why paying close attention to the wire rope in your care is critical to preventing a possible catastrophe. Cleaning and lubricating wire rope will reduce wear and halt corrosion, and below is a step-by-step guide to this important procedure:

1. Position the bridge and wire drum—Begin by moving the bridge of the crane to a safe location where you can easily access the wire rope without interference from other machinery. In addition, be sure the location you choose for cleaning is isolated from areas where moisture sensitivity is problematic. Finally, you will want to have adequate lighting so that rust or other problems are easily visible during the cleaning process.

2. Unspool the wire rope—Once you have chosen a good location for cleaning and lubrication, lower the hoist to the ground and be sure it is safely secured to prevent it from twisting or thrashing as the rope unspools. Slowly unspool the rope and lay it into flat coils on the floor of your work space. Keep unspooling the wire rope until you are unable to safely remove any more rope from the drum.

3. Brush the wire rope to eliminate exterior corrosion—After the wire rope is on the ground in coils, begin at the end closest to the hoist and start brushing the wire rope vigorously to remove any rust deposits or ingrained debris trapped in between wire strands. Remove as much rust as possible with the brush, but don"t use any other tools to scrape at the rust; this will prevent possible damage to the smaller strands.

4. Degrease the wire rope—Once you have removed all signs of rust and other surface debris from the rope, spray it down with an industrial-quality degreasing agent to cut away old lubricants and any stubborn debris that might still be trapped inside the strands. Soak the wire rope well with the degreaser, and allow a few minutes for the degreaser to get between strands.

5. Rinse the wire rope—After the wire rope has soaked in degreasing agent for a short period of time, spray it with a pressure washer to remove the degreaser from the strands. Be sure to move the high-pressure spray around the circumference of the rope in order to penetrate and remove the degreasing agent from all sides.

6. Remove the water from the wire rope—When the wire rope has been rinsed thoroughly, you will need to move quickly to dry up all moisture in the strands to prevent rusting. To dry the rope, apply a strong burst of compressed air along the length of the rope. Be sure to wear eye goggles while blasting the rope with air; this will protect your eyes from possible debris blown out of the strands. Keep applying air until all visible moisture is gone.

7.Lubricate the wire rope—The process of lubricating the wire rope actually involves using two separate lubricants: penetrating and coating lubricants. Each type has its own purpose, as explained below. Here is what you should know about each and how to apply them to the rope:

Penetrating lubricants—Much of the wear and tear placed upon the smaller wire strands of the wire rope occurs on the interior of the rope, as the individual strands slide past each other during the unspooling, spooling, and twisting of the rope. To keep this type of wear minimal, you will need to apply some type of penetrating lubricant to the exterior of the rope and allow it to soak deep into the strands. Penetrating lubricants are lightweight and usually consist of petroleum-based or vegetable-based oils. The simplest way to apply penetrating lubricants is to use a sprayer, but be sure to apply a consistent coat all across the wire rope to ensure it doesn"t evaporate before penetrating.

Coating lubricants—For the exterior of wire rope, it is best to use a thicker lubricant that will resist removal from the strands by moisture, usage, or evaporation. These coating lubricants, which often consist of a variety of grease types, are applied by brush, rag, or dipping into the material. Be sure to apply your coating lubricant last to allow the penetrating lubricant to work its way into the core area of the wire rope.

To learn more about taking care of an overhead crane"s wire rope or any of its other parts, contact a professional from a company like American Equipment Inc.

Do your wire ropes, cables and draglines become rusted, corroded or frayed? You can protect your wire rope and cable from high stress loading, shock loading, jerking and heavy loads with LE"s full line of penetrating and coating wire rope lubricants. Whether you want lubricant to penetrate to the core or to coat and seal, LE has a full range of protective lubricant solutions, including wire rope lubricant applicators to reduce labor costs and ensure safe, reliable operation.

New Extended Warranty: Documented use of LE452, LE453 Wirelife™ Almasol Wire Rope Lubricant or Earthwise™ EAL Wire Rope Lubricant will double the Viper warranty period to 24 months.

A competent person must begin a visual inspection prior to each shift the equipment is used, which must be completed before or during that shift. The inspection must consist of observation of wire ropes (running and standing) that are likely to be in use during the shift for apparent deficiencies, including those listed in paragraph (a)(2) of this section. Untwisting (opening) of wire rope or booming down is not required as part of this inspection.

Significant distortion of the wire rope structure such as kinking, crushing, unstranding, birdcaging, signs of core failure or steel core protrusion between the outer strands.

In running wire ropes: Six randomly distributed broken wires in one rope lay or three broken wires in one strand in one rope lay, where a rope lay is the length along the rope in which one strand makes a complete revolution around the rope.

In rotation resistant ropes: Two randomly distributed broken wires in six rope diameters or four randomly distributed broken wires in 30 rope diameters.

In pendants or standing wire ropes: More than two broken wires in one rope lay located in rope beyond end connections and/or more than one broken wire in a rope lay located at an end connection.

If a deficiency in Category I (see paragraph (a)(2)(i) of this section) is identified, an immediate determination must be made by the competent person as to whether the deficiency constitutes a safety hazard. If the deficiency is determined to constitute a safety hazard, operations involving use of the wire rope in question must be prohibited until:

If the deficiency is localized, the problem is corrected by severing the wire rope in two; the undamaged portion may continue to be used. Joining lengths of wire rope by splicing is prohibited. If a rope is shortened under this paragraph, the employer must ensure that the drum will still have two wraps of wire when the load and/or boom is in its lowest position.

If a deficiency in Category II (see paragraph (a)(2)(ii) of this section) is identified, operations involving use of the wire rope in question must be prohibited until:

The employer complies with the wire rope manufacturer"s established criterion for removal from service or a different criterion that the wire rope manufacturer has approved in writing for that specific wire rope (see § 1926.1417),

If the deficiency is localized, the problem is corrected by severing the wire rope in two; the undamaged portion may continue to be used. Joining lengths of wire rope by splicing is prohibited. If a rope is shortened under this paragraph, the employer must ensure that the drum will still have two wraps of wire when the load and/or boom is in its lowest position.

If the deficiency (other than power line contact) is localized, the problem is corrected by severing the wire rope in two; the undamaged portion may continue to be used. Joining lengths of wire rope by splicing is prohibited. Repair of wire rope that contacted an energized power line is also prohibited. If a rope is shortened under this paragraph, the employer must ensure that the drum will still have two wraps of wire when the load and/or boom is in its lowest position.

Where a wire rope is required to be removed from service under this section, either the equipment (as a whole) or the hoist with that wire rope must be tagged-out, in accordance with § 1926.1417(f)(1), until the wire rope is repaired or replaced.

Wire ropes on equipment must not be used until an inspection under this paragraph demonstrates that no corrective action under paragraph (a)(4) of this section is required.

At least every 12 months, wire ropes in use on equipment must be inspected by a qualified person in accordance with paragraph (a) of this section (shift inspection).

The inspection must be complete and thorough, covering the surface of the entire length of the wire ropes, with particular attention given to all of the following:

Exception: In the event an inspection under paragraph (c)(2) of this section is not feasible due to existing set-up and configuration of the equipment (such as where an assist crane is needed) or due to site conditions (such as a dense urban setting), such inspections must be conducted as soon as it becomes feasible, but no longer than an additional 6 months for running ropes and, for standing ropes, at the time of disassembly.

If the deficiency is localized, the problem is corrected by severing the wire rope in two; the undamaged portion may continue to be used. Joining lengths of wire rope by splicing is prohibited. If a rope is shortened under this paragraph, the employer must ensure that the drum will still have two wraps of wire when the load and/or boom is in its lowest position.

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There is a continuous wear of sideways of tracks and drum collar failures in overhead cranes due to the problem of alignments. These areas remain neglected due to the non-availability of proper lubricant. We offer Chemilube Molybond 300 as a complete and proven solution for this problem.