Galvanized wire ropes are available for special applications requiring additional levels of corrosion protection that cannot be fully accomplished through the lubrication of the wire rope. Fiber synthetic or sisal, which is the weakest, strand the core is a wire strand, just like the other strands of the rope. Mependent wire rope iwrc this is a separate wire rope. Detection of broken wires in elevator wire ropes with. Normally, an elevator wire rope is composed of six, eight or nine strands with fc or iwrc as shown in the following pictures. Active redundancy is provided by the interaction between wires laid jointly to create a rope or the multiple arrangements of suspension ropes in elevator systems. Laboratory testing has shown that standard gustav wolf natural fiber core rope sold by draka elevator exhibits comparable elongation to commonly used brands of. The core serves as the foundation to hold the rope together. The ss450 316 stainless steel wire rope clips 43 4 certex provides usingthe rope slings, rope terminations and other tailormade assemblies that allow our customers to tackle their lifting challenges with confidence.
Pdf influences on lifetime of wire ropes in traction lifts. Basic field practices for installation of elevators and escalators by kermit kraus. The wire ropes of this company are used for all of these elevators. Along with the bethlehem elevator rope catalog, these bulletins will discuss, in further detail, those items and questions in which our customers are most interested. This article reports the condition monitoring of a steel wire rope from a hoisting elevator with broken wires as a result of corrosive environment and fatigue. The first bulletin is intended to help in the basic terminology of the product. Finite element analysis was conducted as a baseline to study guided wave propagation in wire ropes and plot dispersion curves. Module 10 final exam elevator preventive maintenance.
Suspension ropes, bigger in diameter than 16 mm 58 with 6 to 9 outer strands should have at least filler wire. Wire rope replacement criteria tech tip 2 t e c h t ip draka elevator 02 0112 2151 n. We stock large quantities of different varieties to be available for whatever type job you may have. Wire rope inspection iph recommends wire rope inspections every six months. Consult industry recommendations and asme standards before using. The use of elevator wire ropes rope services direct. Steel wire ropes in elevators 092015 pfeifer drako frequently asked questions about wire ropes in elevators why are wire ropes used in elevators.
Eye or eye splice a loop, with or without a thimble, formed at the end of a wire rope. Sheave hardness varies between elevator companies and sheave design, as well as with age of the equipment. Suspension ropes, bigger in diameter than 16 mm 58 with 6 to 9 outer strands should have at least filler wire strands because of better flexibility. The wire ropes unless properly protected against oxidation tend to corrode fast and result in fatigue failures. Some of the rope services direct ltds sturdy rope a safe alternative. At certex, every custom operation from cutting rope. A number of operations of the crane shall be carried out at ap proximately 10 % of the normal load to stabilize the wire rope. The wire rope coupling 240 can be attached at one end to the ubolt 252 via a locking dring 254 that is provided through one of the. End termination the treatment at the end or ends of a length of wire rope, usually made by forming an eye or. Our global team of experts can also help customize the properties to your specific requirements.
With over 35 years of experience in the industry, we have built a global reputation for providing highquality, innovative components essential to effective elevator operation. In hoist rope, as well as many compensating and governor rope. Wire rope coupling for elevator draka elevator products inc. Wire rope cores natural fiber is the most common core used in elevator ropes in north america. The quality of the steel wires used for elevator cores has a substantial impact on the service life of the rope. An additional benefit of the steel core is that these ropes will exhibit somewhat reduced stretch when compared with that of fiber core ropes. Meanwhile, steel cores low the elongation of elevator wire ropes under same loads compared with fiber core. Elevator ropes and accessories for north america prysmian.
As the elevator wire ropes will be regularly lifting heavy loads, with both the weight of the elevator and the multiple passengers that it must carry, it is important that it is strong and reliable. Williamsport, pa 17701 usa tel 5703265146 fax 5703274274. However, any warranty, expressed or implied as to quality, performance or fitness for use of wire. European and international elevator rope standards en 12385 part 5 2 also 4344 3 have coined the term rope grade to describe rope strength. A ubolt 252 can be attached to the elevator cabin 250. Bekaert elevator rope wire meets the standard en102642 specifications. Factors such as working environment, number of trips, maintenance program should be taken into account during these activities. Diameter range for bethlehem elevator rope, as manufactured diameter loaded rope unloaded rope inches inches inches. Ced can provide you with the highest quality elevator wire rope in the industry.
Prestretching some wire rope manufacturers promote prestretched rope at a premium price. Elevator hoist rope with steel core iwrc steel core elevator hoist ropes are used where additional strength is required without increasing the diameter of the wire rope. Steel core elevator hoist ropes are used where additional strength is required without increasing the diameter of the wire rope. Steel for elevator wire ropes is tailormade to achieve the highest levels of strength, ductility and endurance. User reference guide for elevator ropes pdf elevator books. Gauge, wire rope tension go nogo gauge, red, 10mm, 11mm, 12mm, mm, 16mm, 18mm, 19mm. Therefore the wires and the ropes are galvanized unless otherwise demanded. However, any warranty, expressed or implied as to quality, performance or. Our elevator ropes come with a bright selfcolored finish and a lubricant designed to enhance the traction process. Together with the other two articles in this series elevator world, may and june 2016, this brief history of elevator wire ropes serves, in many ways, as an outline of a more complex story. Not only does the solvent counteract the lubricant, the throwoff results in a dirty machine room and may harm the rotor or other electrical components. This information will also be useful in discussing future bulletins. Fishing rope larger outer wire diameter, superior quality of galvanization, and application of high quality of lubricant in manufacturing to check corrosion considerably, together.
Service life prediction of running steel wire ropes. Wire rope products will break if abused, misused or overused. Used for both lifting and stabilizing, bethlehem wire rope products are used in a wide variety of applications ranging from crane and elevator hoist ropes to bridge suspension and anchoring offshore platforms. For more information on wire rope stretch, contact draka elevator. Our extensive product inventory of over 7,000 components includes compensation, traveling and hoistway cables, wireway, wire rope and accessories, tools, maintenance and. The mechanical properties are important for the proper use in lifts and the ride quality. But first of all the wire ropes for all other suspension means as well have to. Elevator hoist rope benefits from periodic relubrication in use. What should you do if you found the brushes of a dc hoist motor to be 50% or less. In order to achieve slipfree operation in the elevator, they are given a relatively. In order to reduce friction, wire ropes are well lubricated the lubrication requirement is dependent on the application of the wire rope. Abnormally high temperatures, high traction, fast line speeds and small bending ratios dry out andor expel wire rope.
It defines the nominal tensile strengths of the outer and inner wires, and assigns the rope a defined minimum breaking strength. Standard 6 x 19 and 6 x 36 classification ropes 6 x 19 vs. If synthetic rope may be subjected to damage such as from welding or cutting operations, a csaapproved 38 diameter wire rope lifeline may be used, provided a csa approved rope grab that is matched to the wire rope is also used. Wire rope installation guide prysmian group denmark as. Fiber core 6x1 9 w arring ton, 6x25 filler 8x19 w arring ton, 8x19 seale, 8x21 filler, 8x25 filler diameter nominal weight nominal weight inches streng th, lbs. During regular use, the amount of lubricant decreases, heavily impacting the lifespan of the rope. Elevator ropes are made up of bright wires that are unprotected against corrosion. Elevator rope lubrication bleeds from the elevator hoist rope and is thrown off during operation. Traction steel elevator ropes provide the qualities needed for satisfactory elevator service. The increased specificity of the code was doubtless informed by the gradual accumulation of data on wire rope use during the 1930s and 1940s. However, in some highrise highspeed, most mrl and certain hydraulic applications, the use of steelreinforced natural fiber or full steel core iwrc ropes is becoming more common. Exposure to the sun may damage or weaken synthetic lifelines.
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