Fibre Rope Catalogue - Bridon

Technical InformationRope installation and handling equipmentFull guidelines for rope installation and operation areavailable on request from Bridon.Capstans and WinchesRopes used on single drum or split drum winches shouldbe installed under tension and the initial layers should be aclose tight fit between the flanges to prevent burying intothe lower layers. A minimum of eight wraps of rope shouldbe maintained on the drum at all times.Care should be exercised to avoid surging while thecapstan or winch head is rotating. Excessive surging orslipage causes localised over heating which can melt orfuse synthetic fibres with resulting loss of strength.Where possible the working or bearing position of a ropeshould be moved frequently to spread wear. The "furry"look of a well used synthetic fibre rope is not necessarily anindication of weakness. In fact the "furry" or hairy surfacecan serve to protect the rope.Winch/Reel CapacitydBASharp BendsSharp bends around any piece of equipment should beavoided. Where a static rope passes around any surfacewith a deflection of 10 degrees or more then the diameterof the surface should be a minimum of three times the ropediameter. Any sharp bend in a rope under load willsubstsntially decrease its strength and may causepremature damage or failure.Eye SplicesThe length of an eye in a rope should be a minimum of threetimes, and prefereably five times, the diameter of the itemaround which it is to be passed. This will ensure that the anglebetween the two legs of the eye will not cause a tearing actionat the throat of the eye. For instance if the eye of a mooring lineis passing around a 600mm diameter bollard then the eyeshould be a minimum of 1.8 metres and preferably 3 metres.Retiring RopesApart from rejecting your rope when obviously damaged,it is wise to establish lifetimes of your rope within theparameters of the use for which it was selected. This willallow you to retire your rope on a regular scheduled basis,provided of course, that your conditions of usage remainunchanged. Remember to re-establish your discard criteriaif changing rope type, rope material or rope breaking load.Safety of life and property is the prime consideration. If indoubt ask Bridon for recommendations.Quality & ServiceQA/CertificationRope Length (metres) = (A+B)xAxCxπx10 6Where A, B, C are in metres and d is millimetresPulleys and SheavesThe ratio between rope diameter and sheave diameter iscritical to the safe usage of a rope. As a general guide aratio of 8:1 minimum should be used for 8-strand, 12-strand and Braidline (Double Braid) ropes and 12:1minimum should be used for Superline ropes. The grooveof the pulley should be "U" shaped and the groove width10% greater than the rope diameter. The depth of thegroove should be approximately half the rope diameter.C"V" shaped grooves should not be used as they tend topinch and damage the rope by increasing friction andcrushing the fibres. Sheave surfaces should be smooth andfree from burs. Sheaves should be maintained regularly sothat they are free to rotate at all times.d 2Bridon operate a strict quality system accredited to BS ENISO 9001 approval by Bureau Veritas Quality International.In addition, recognised classification bodies such asLloyds, ABS, BV and DNV can also certify products andsystems. For offshore applications, ropes can bemanufactured and certified in accordance with OCIMFguidelines where applicable.Design ServicesFor specific jobs and applications our Research andDevelopment department has extensive laboratoryfacilities and is available to design products tailored toindividual requirements. Bridon can also offer advice andhelp in specifying ancillary equipment and developingoperating procedures.After Sales & Rigging ServicesBridon International Services are able to offer a fulltechnical and rigging after sales service utilising our owndedicated trained personnel and approveddistributors/stockists giving world wide coverage. Bridonsupply a wide spectrum of services whether yourrequirements are onshore or offshore including thecapability of offering emergency rigging, rope training andrigging courses, rope installation, visual inspection anddestructive testing ensuring that our customers obtainmaximum performance from our products.26 BRIDON Fibre