overhead crane wire rope lubricant quotation

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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.

Centraline Lubro-Tech Engineers Pvt Ltd offers an automatic Wire Rope Lubrication System. This unique system benefits end users and wire rope manufacturers with considerable cost and time savings in lubricating their wire ropes automatically. Manual lubrication of wire ropes via the drip, brush, spatula or rubber glove method has always been a difficult and time consuming maintenance task. Typically messy asphaltic or “blackjack” type products are employed which have coating abilities but very little lubrication or penetration properties. The Centraline wire rope lubricator provides fast and effective one pass lubrication of wire ropes from 5/16” (8 mm) to 2-5/8” (67 mm) in diameter at speeds up to 6670 feet (2,000 meters) per hour, it eliminates the slow and labour-intensive task of manual lubricant application, at the same time achieving more thorough results by forcing quality lubricant under high pressure right through to the core of the wire rope. The wire rope lubrication system package consists of: high strength collar; grease lube pump; air regulator with PG and air control valve; high pressure lube delivery hose and QDC; high pressure lubricant control valve; excess lubricant drain hose; retaining ratchet straps and shackles; carry strap for the collar; robust aluminium storage case; highly durable polyurethane seals (to be selected and ordered separately); aluminium scrapers (to be selected and ordered separately); wire rope cleaner (to be selected and ordered separately). Features and benefits: no more manual greasing; stops corrosion/protects ropes; penetrates to the wire rope core; less waste and mess; fast and efficient – at speeds up to 6670 feet (2,000 metres) per hour; high pressure – high pressure operates up to 6,000 PSI; and lubricates ropes from 5/16” (8 mm) to 2-5/8” (67 mm) in diameter.

Sheaves facilitate the smooth and safe operation of overhead crane hoists. Damaged sheaves can wear ropes prematurely and cause other dangerous hazards, such as binding wire rope. Konecranes technicians are trained to identify and correct problems with sheaves and other parts of hoisting equipment.

Sheaves carrying ropes which can be momentarily unloaded shall be provided with close-fitting guards or other suitable devices to guide the rope back into the groove when the load is applied again.

The sheaves in the bottom block shall be equipped with close-fitting guards that will prevent ropes from becoming fouled when the block is lying on the ground with ropes loose.

In using hoisting ropes, the crane manufacturer"s recommendation shall be followed. The rated load divided by the number of parts of rope shall not exceed 20 percent of the nominal breaking strength of the rope.

Rope clips attached with U-bolts shall have the U-bolts on the dead or short end of the rope. Spacing and number of all types of clips shall be in accordance with the clip manufacturer"s recommendation. Clips shall be drop-forged steel in all sizes manufactured commercially. When a newly installed rope has been in operation for an hour, all nuts on the clip bolts shall be retightened.

Wherever exposed to temperatures, at which fiber cores would be damaged, rope having an independent wirerope or wire-strand core, or other temperature-damage resistant core shall be used.

Replacement rope shall be the same size, grade, and construction as the original rope furnished by the crane manufacturer, unless otherwise recommended by a wire rope manufacturer due to actual working condition requirements.

Konecranes wire rope inspections can help crane users extend the life of hoist ropes. Ropes, sheaves and other reeving system components are inspected for compliance with crane standards, and to determine if they have flaws that could hinder safe operation. Contact us today to schedule an assessment.

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.

The manual lubrication of wire ropes via the drip, brush, spatula or rubber glove method has always been a difficult maintenance task. Typically employed are messy asphaltic or “blackjack” type products, which have coating abilities but very little lubrication or penetration properties.

The VIPER Mid MK II Wire Rope Lubricator provides fast and effective lubrication of wire ropes from 5/16 in (8mm) to 2–5/8 in (67mm) in diameter, at speeds up to 6,670 ft (2,000 m) per hour. It eliminates the slow and labor-intensive task of manual lubrication, at the same time achieving more thorough results by forcing quality lubricant under high pressure right through to the core of the wire rope.

The system consists of the lubricator Collar assembly, which houses the polyurethane seals to suit the specific size rope. The assembly is clamped around the rope and anchored to a fixed point. The rope is then pulled through the collar as the lubricant is applied with a high pressure grease pump, forcing lubricant between the strands to the center or the rope. The result is a fully lubricated wire rope with a smooth minimal film of lubricant on the outer strands.

The benefits over conventional drip and brush or spray systems are substantial. The Viper MK II Wire Rope Lubricator operates at a higher pressure than most other lubricator collars on the market; this combined with the robust construction guarantees fast, safe and effective wire rope lubrication.

For lubricating larger rope sizes 2 in (50mm) to 6 1/2 in (165mm), you will need the Viper Maxi MK II. Viper Mini MK II lubricates rope sizes 15/64 in (6mm) to 1 13/32 in (36mm.)Please contact us for more information about these solutions.

EN12385-2 Steel wire ropes – Safety – Definitions, designation and classification provides a detailed explanation of all the terms and abbreviations used when describing a wire rope and its components. Below are a few of the most common abbreviations;

Steel wire ropes are specified in terms of a Nominal Rope Diameter and when produced have a manufacturing diameter tolerance, this tolerance can vary depending upon customer requirements and specifications and is often dictated by the diameter of grooving within sheaves and drums in which the wire rope will be expected to operate. If no diameter tolerance is specified, the general diameter tolerance is, Nominal Diameter +0% to +5% as specified within various International Rope Standards (EN12385-4, API-9A, ISO 2408). However, please note other diameter tolerances may be applied to ‘small’ diameter ropes and ropes used for specific applications/industries e.g. Mining, Aerials, Elevators, etc.

When designing any rope operated equipment, designers should consider the relevant National and/or International Standards which refer to acceptable sheave and drum diameters based upon the application, industry, etc. The diameter of sheaves and drums together with the tension, are normally associated with overall service life of the rope and in ‘simple terms’ the larger the diameter the longer the service life, although consideration should also be given to the anticipated modes of rope deterioration which will also significantly affect the service life. Typically, the diameter of sheaves and drums for crane applications are 16 to 28 times the nominal rope diameter.

Wire ropes are generally subjected to a visual examination and specifically for crane ropes these is an International Standard ISO 4309 “Cranes – Wire ropes – Care and maintenance, inspection and discard” which provides guidance on the inspection of wire ropes and provide the discard criteria. The document also includes information on the Magnetic testing of roper in service / Non-Destructive Examination and how this can assist the competent person in combination with his visual examination, determine the overall condition of the rope. All wire ropes should be inspected on a routine basis by a competent person to ensure that they remain is a good condition whilst in service and removed from service before they become dangerous. However, this standard is used for offering guidance for ropes operating in other systems where no specific discard criteria are given for that application, industry or country in which the rope is operating.

Please note, wire ropes can cause death and/or serious injury if not correctly handles, operated and maintained to good condition and care should always be taken when work with or close to wire ropes.

A new rope can easily be damaged if the pulley wheel groove is too tight, this will in effect pinch the rope probably causing a wave (spiral) deformity in your new rope.

If left unchecked in a steel pulley, parallel, linear fatigue wire breaks will be found where the contact pressures have become too high, due to a pinch affect.

The Lang’s construction, due to the wires running across the axis of the rope is the same direction as the strand, provides a greater length of wire on the exterior surface of the rope and hence since there is an increased surface area there is an increased area of steel to wear away before a broken wire occurs, therefore offering greater wear resistance. Therefore, applications where the rope is operating over larger number of support rollers and/or sheaves, the Lang’s lay rope may be of benefit.

The direction of the wires within the Lang’s lay construction also reduces the level of mechanical damage and rope interference, which takes place between adjacent wraps of rope within the crossover zones during multi-layer spooling of wire rope.

It is important to state that, single layer strand and parallel laid, rope constructions, manufactured in Lang’s lay, MUST NOT be used with one end free to rotate. Since the wires and the strands as twisted in the same direction, if the rope is free to rotate the wires and the strands will untwist tighter and seriously affect the integrity and breaking strength of the rope.

Wire ropes may be considered as machines, each with approximately 200 to 300 individual wires, which move independently to each over whenever ropes operate around sheaves or spool on or off winch drums, therefore ensuring ropes are lubricated internally will minimise the level of friction between the individual wires and optimise the ropes bend fatigue performance. Lubricant internally and externally will protect the ropes from corrosion and this applies equally to both un-galvanised/bright ropes and galvanised rope. Although the zinc on the surface of the individual wires of a galvanised rope will protect the wires from corrosion, once the zinc has sacrificed itself (oxidised) to protect the steel, the wires are then susceptible to corrosion. The longer the zinc can be protected by the lubricant the longer the zinc remains to offer protection to the steel. However there are applications where internal or external lubricant on the rope may not be advisable, anywhere the lubricant could drop off the rope and contaminate products (paper, food, etc.) in the vicinity of the rope or where the lubricant on the exterior of the rope may be contaminated with debris in the atmosphere (grit, sand, etc.). In this application, it must be accepted that ‘dry’ ropes will have a significantly reduced service life.

Ropes may be lubricated in-service with either oil or grease, both products offering slightly different benefits. Oils may be applied from a portable spray unit and although the ropes may require being re-lubricated more frequently, since it is relatively easy and cleaning to apply, operators are more likely to re-lubricate the ropes in service. The thin oil may penetrate the rope and surface coat the exterior of the rope with a thin film of lubricant, which also allows for relatively easy routine visual inspection of the rope. Alternatively, rope may be lubricated with a soft bearing type grease; the grease may be applied using a suitable pressure greasing system (Masto, Viper, etc.) to ensure uniform coating of grease along the total length of the rope passing through the greasing system, although the level and colour of grease may make visual inspection difficult. It is important that any oil or grease used to lubricate ropes in service is compatible with the lubricant applied to the rope during manufacturing and Bridon-Bekaert offer a range of wire rope lubricants specially formulated to be suitable for most environments and operations, including ECO VGP 2013 compliant (Bio-degradable, Non-toxic & Non-accumulative) products.

For ropes operating above ambient temperature consideration must be given to the effects the operating temperature may have on the wire rope. For guidance, unless otherwise stated, the maximum operating temperatures are provided in the International Standards e.g. EN 12385-3. However searches of these standards by Bridon-Bekaert indicate that the quoted temperatures within the standards have remained constant for a significant period of time, having been developed when rope constructions and usage centred around common 6-stranded rope constructions. With the introduction of more complex rope constructions incorporating higher tensile grade wires, synthetic lubricants and polymers, Bridon-Bekaert’s experiences indicate that reconsideration of the maximum operating temperatures is required. For high performance ropes incorporating synthetic lubricants and polymers Bridon-Bekaert recommend a maximum operating temperature of 100 degrees C. Excessive bleed out of lubricant from the rope may occur depending upon the rope operating temperature and the type/composition of the lubricant and frequent re-lubrication may be required.

Certain applications (Heave compensation systems, etc.) can generate high operating temperatures and for these and any application or where ropes are stored above ambient temperature, Bridon-Bekaert would be please to discuss this subject further.

Also due the smoothness of the circumference of these rope designs, they reduce wear at the cross over contact points as the rope wraps over itself as it is wound onto the drum.

An Ordinary lay rope is where the individual wires in the outer strands are spun / twisted together in the opposite direction to the direction the outer strands are twisted around the core, which results in the individual wires running along the axis of the rope. A Lang’s lay rope is where the individual wires in the outer stands are twisted in the same direction as the outer strands are twisted around the core, which results in the individual wires running across the rope in the same direction as the strands.

It is important to state that a left hand lay rope and a right hand lay rope MUST never be joined together unless the jointing mechanism is prevented from rotating, otherwise the rope will be allowed to un-twist together, which may have a significant effect on the integrity of the ropes, and could result in failure of the rope. There are two particular situations/arrangements where a left hand and/or right hand rope combination may be considered beneficial;

To prevent rotation of load – Twin rope operating systems (Overhead hoists, Grabbing systems, Container handling cranes, etc.) are generally designed to utilise one left hand rope and one right hand lay rope. When lifting a load both ropes will be subjected to an axial load and will try to un-twist, but since the ropes have been spun in different directions during manufacture one rope will trying to un-twist in one direction whilst the other rope will try to un-twist in the opposite direction, the two ropes therefore acting against each other to prevent/minimise rotation of the load.

When spooling a rope – Tension is generally applied to ropes whilst they are being spooled on to a winch drum and this tension will try to rotate / untwist the rope and therefore it is preferable to have the rope rotating up against the previous wrap of rope to minimise ‘gapping’ between the adjacent wrap of rope particularly on the bottom layer. Therefore, to achieve this, depending if the rope is anchored on the left or right hand side of the drum or the rope is being spooled under-wound or over-wound will determine if, a left or right hand lay rope should be utilised.

Rotation Resistant ropes are normally used to lift or suspend a load without the load rotating (example, hoist ropes used on Offshore, Mobile and Tower cranes, etc.) and are constructed by spinning the inner part of the rope in one direction and the outer part of the rope in the opposite direction. When an axial load is then applied to the rope the inner part will try to untwist in one direction and the outer part will try to untwist in the opposite direction, with the two parts of the rope reacting against each other. Rotation Resistant ropes are normally of a multi-strand construction and constructed of 2-layers of strands with the inner layer spun in the opposite direction to the outer layer and of 3-layers of strands with the inner two layers spun in the opposite direction to the outer layer. Three and four stranded rope constructions may also be considered as rotation resistant, but having only three or four strands, the ropes do not exhibit such a smooth exterior profile and may prove to be more difficult to spool, particularly when multi-layer spooled.

Wire rope does not have a defined shelf-live, provided the rope has been stored and maintained to ensure that the rope has not been allowed to deteriorate. To ensure that ropes remain in good condition, it is considered good practice to ensure the ropes are stored off the ground in a well-ventilated environment, protected from the sun, rain, sand/grit/dirt, chemicals or any other forms of contamination. Depending upon the environment the lubricant on the rope will tend to migrate to the bottom of the reel and dry out during storage. It is therefore good practice to rotate reels to prevent the lubricant migrating out of the rope on to the floor and to re-lubricate the ropes during storage by simple spraying a thin oil on to the surface of the rope to prevent the steel wires from corroding and/or zinc coating on the wires from oxidising (white rust). Whilst wire ropes are in storage they should be routinely inspected to ensure they have not been accidentally damaged, that all identification and certification remains in place and that the ropes remain fit for use. Rope being taken from storage on a ‘first in – first out’ basis, to minimise the length of time in storage.

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What lubricant or oil do I use in Demag gearboxes? This is a frequent question we get from crane technicians and maintenance personnel alike. Find out why changing the lubricant at regular intervals is so important and Click here to download our Technicians Guide to Demag Oils & Lubricants.

Depending on the model, Demag uses a variety of different lubricants and oils that optimize the performance and life of gearboxes, chains, and wire rope. Some models use mineral oil with high pressure additives, some use gear grease, and others use specialized gear oils. Some of these lubricants are packaged specifically for Demag while others use lubricant products from brands like Whitmore, Kluber, and ESSO Spartan. Always make sure you use the correct oil and lubricant for the specific Demag product you are working on.

Looking for a quick guide on what lubricants and oils are used in Demag products? Click here to download the Technician’s Guide to Oils and Lubricants Used in Demag Gearboxes and Hoists.

It is important to maintain and protect your steel wire ropes, and for that we offer both Brilube lubricant and Verolube spray. Contact us for advice and guidance.