Care in Use<\/p>\n
Storage<\/strong> Coiling<\/strong> Braided ropes can have excessive twist imparted into them by incorrect handling.\u00a0 Ideally these ropes should be \u201chanked\u201d in a figure of 8 fashion avoids putting twist in and will ensure free running when deployed.<\/p>\n If supplied on a reel, this must be allowed to rotate freely on a central pin so that the rope may be drawn off from the top layer.\u00a0 Never take the rope from a reel lying on its side unless placed onto a turntable. The profile of the groove in a sheave should support the entire rope.\u00a0 Normally a semicircle of 10% greater diameter than that of the rope is appropriate.\u00a0 \u2018V\u2019 groove sheaves should be avoided since they compress the rope and have points of local friction reducing the life of the rope.\u00a0 Sheaves should be maintained so that they rotate freely in use.<\/p>\n Winches and capstans<\/strong> When using ropes on winches or capstans the friction between the rope and the barrel is vitally important since this will determine the amount of slip and the number of turns needed.\u00a0 This friction is dependent on the rope material and construction as well as the surface finish in contact with the rope.\u00a0 Since the rope\u2019s geometry will change depending on load the friction can also change slightly.<\/p>\n Chemicals<\/strong> Heat<\/strong> Friction generated heat<\/strong> Ultra-Violet Radiation<\/strong> Abrasion<\/strong> Abrasion can also be caused by the ingress of particles into the rope.\u00a0 Conditions where a rope will come into contact with sand, dirt, grit and other abrasive particles should be avoided.\u00a0 Damage caused by this type of abrasion may not be visible on the outside of a rope yet the strength may be severely reduced.<\/p>\n <\/p>\n <\/a>Terminations<\/p>\n <\/p>\n <\/a>Inspection and Retirement<\/p>\n It is important that a rope is regularly inspected to ensure that it is undamaged and is still fit for service.\u00a0 The entire length of rope should be examined.\u00a0 The following are some of the points that should be checked.\u00a0 The degree to which any of the following may be allowed before the rope is retired will be dependant on the assumptions made when the rope and safety factors were determined.<\/p>\n No rope will last forever and it is important to ensure that if there are any risks if a rope fails then it should be retired after an appropriate period.<\/p>\n <\/p>\n <\/a>Lifetime Factors<\/p>\n Care in Use Storage Ropes should be stored in a suitable clean, dry place out of direct sunlight and away from extreme temperature.\u00a0 Do not store ropes on dirty floors or drag over rough ground \u2013 dirt and grit can … Continue reading
\nRopes should be stored in a suitable clean, dry place out of direct sunlight and away from extreme temperature.\u00a0 Do not store ropes on dirty floors or drag over rough ground \u2013 dirt and grit can work between the fibres and cause abrasion damage.\u00a0 Keep ropes away from chemicals and in cases of long term storage, hose down with fresh water as to reduce dirt and salt that can affect the life and efficiency.Watch out for mice they love a coil of rope to sleep in<\/p>\n
\n3 Strand ropes may become damaged if they are taken from a coil the wrong way.\u00a0 If this happens turn the coil over and withdraw the rope from the centre \u2013 the rope should run correctly without kinking<\/p>\n
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\nSheaves, pulleys and rollers<\/strong>
\nWhen any rope is used around a sheave there will be a reduction in its strength and life.\u00a0 For most non-specialised applications a sheave diameter 8-10 times the rope diameter will suffice, however certain materials such as Aramids may require a sheave size of up to 20 times diameter<\/p>\n
\nWhen a rope is wound onto a winch it is important that the wraps are neat and tightly wound.\u00a0 This can be achieved by winding the rope on whilst under tension.\u00a0 If the rope is wound on slack then it will be more prone to burying between the turns of the previous layer.<\/p>\n
\nThe materials used in the construction of synthetic fibre ropes can be affected by exposure to chemicals, often this will reduce the strength of the rope – see physical properties section for more information.\u00a0 Each of the materials is affected differently by different chemicals, if chemical exposure is expected contact Marlow ropes for more details.\u00a0 If a rope has been exposed to a chemical that may have caused damage it should be retired from use.\u00a0 Chemical damage often appears as discoloured or powdery \/ dusty yarns however the rope can be significantly weakened with no visible effects.<\/p>\n
\nExposure to elevated temperatures can change the properties of a rope.\u00a0 In some cases these changes can be beneficial e.g. Pre stretching and heat setting.\u00a0 More often the effects of heat will be to reduce the strength and damage the rope.\u00a0 It is important to avoid exposing a rope to localised heat sources or elevated temperatures.\u00a0 This must be ensured both in use and when the rope is stored.<\/p>\n
\nWhen a rope is used on a winch or capstan it is possible to generate enough heat through friction to melt or fuse the fibres of the rope resulting in a reduction in performance.\u00a0 To avoid this care should be taken to avoid excessive slipping or surging.\u00a0 Many ropes are designed specifically to withstand friction generated heat – please contact our technical department for more details.<\/p>\n
\nAll the materials used in the construction of synthetic fibre ropes are to a greater or lesser extent effected by exposure to UV radiation.\u00a0 Wherever possible try to limit the exposure of the rope to sunlight.\u00a0 Smaller ropes are effected more than large ropes since they have a larger exposed surface area in proportion to their volume.\u00a0 The effect of UV radiation on a rope is directly linked to the inherent UV properties of the yarn used in design and manufacture – see physical properties section for more information.<\/p>\n
\nAll ropes can be damaged if they are exposed to abrasive surfaces or sharp edges.\u00a0 Care should be taken to try and avoid running a rope over any non-moving surface.\u00a0 If the rope is run over sheaves or rollers they should be kept in good order with a smooth surface and they must be free to rotate.<\/p>\n\n
\nSome materials like Aramids and HMPEs will require a larger eye with an angle at the throat of 15 degrees or less.<\/li>\n<\/ul>\n\n
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