National Braiding takes tremendous
precision to manufacture rope to exacting standards and specifications. The
ropes are made from high quality yarns and therefore new ropes maintain the
original specification conformance. Rope can last for a long time and retain
its properties should the rope have proper care. Using a durable fabric
bag to store or transport rope, prolongs its lifespan. Damaged rope can fall
apart during use and cause untold damage and injury to persons and property
alike. Therefore it is important to take note of the various key points
required to prevent damage and replacement of rope, in general.
Unreeling new rope
Remove new rope from a reel by
pulling the rope from the top of the reel whilst the reel is free to rotate.
Never unreel rope from the side as it causes kinks and strand distortion.
Synthetic rope has higher recoil
tendencies than natural fibre rope. Never stand in line with rope under tension
– if the rope fails it can recoil with lethal force. Reverse rope ends regularly
as it permits even wearing and assures a longer, useful life span.
Abrasive conditions should be avoided
at all costs for rope applications and storage. Any rope can be severely
damages if subjected to abrasion, sharp edges or rough surfaces. Chocks, bits,
winches, drums and other surfaces must be kept in good clean condition without
burrs or rust. Pulleys must be able to rotate freely and the correct size to
avoid excessive wear. Do not drag rope over the ground as dirt and grit picked
up by the rope can work into the strand and damage the internal fibres.
Dirt and salt cause premature wear.
Frequently wash rope with fresh water and a mild detergent. Rinse thoroughly
and hang out to dry.
The tensile strength is the load at
which a new rope, tested under laboratory conditions, can be expected to break.
Age, usage, storage conditions and type of terminations (knots) will lower
The working load for most ropes is
between 5 and 20% of the listed tensile strength depending on the age and
condition of the rope. When you tie a knot, it effectively cuts the tensile
strength by half. The knot when tensioned, cuts the line. Whilst certain types
of knots damage the line less than others, the 50% loss of tensile strength is
a good general rule to adopt.
Extreme temperatures has an effect on
tensile strength of the rope. The tensile strength reports are tested under
normal room temperatures. Continued exposure to high temperatures can distort
synthetic rope fibres and cause permanent damage. Never dry a rope in front of
a fire or store the rope near a stove or heat source. The heat weakens the
synthetics fibres in the rope, thus reducing the tensile strength.
Rope should be stored in a clean dry
place, away from direct sunlight and extreme heat. Some synthetic rope may be
severely weakened by prolonged exposure to UV rays. A notable indication of
degradation is when the surface is scraped off, it results in a powder residue.
It is generally advisable to prevent
exposure to chemicals where possible. Synthetic fibres have a good chemical
resistance but exposure to harsh chemicals like acids, alkalis and organic
solvents should be avoided. When the surface of the rope rubs off in a powder
residue, can be indication of a chemical attack.
Inspect each line before using. Although it is impossible to always
guarantee when the rope has to be replaced, it is imperative to check for
frayed strands, broken yarns, mechanical, temperature and chemical damage.
Kernmantle ropes will show “boogers” (tufts of white thread peeking through the
mantle) which is a clear indication of damage to the core. Regular inspection
before use is imperative to ensure that the rope is still serviceable. If there
is any doubt as to the safety of the rope, replace it immediately.