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Guide to Knots

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Guide to Knots Guide to Knots www.theatresafe.com.au [email protected] www.facebook.com/theatresafeaustralia This product is intend for trained and competent persons and should only be considered as a guide only. TSA takes no responsibility for any information a person uses from this documentation. Please consulate a professional on the best product for your use Clove Hitch A clove hitch is two successive half-hitches around an object. This knot is a very common knot to use for quick easy ties such as tying o a hauling line. It is recommended that a half hitch is tied in at the end of the knot for knots that will be left unattended for long periods of Aftertime. large loads you may www.theatresafe.com.au [email protected] Bowline A bowline is a very useful knot in many circumstances, It does not bind tight under large loads, which makes this knot easy to untie after lifting heavy loads.The Bowline knot can work its way loose under no load so persons using this knot must be mindful of this. www.theatresafe.com.au [email protected] Figure-8 The Figure-8 Knot is very commonly used in the climbing industr, y It is also commonly used as a stopper knot in manually operated tag lines. The Figure-8 knot does not bind tight under large loads, which makes this knot easy to untie after lifting heavy load. www.theatresafe.com.au [email protected] Double Fishermans The Double Fishermans knot is commonly used for joining two ropes together to make a strong bond. www.theatresafe.com.au [email protected] Load Limit Every time a knot is tied into a rope the knot will cause the rope to have a reduced load limit. Below is a table of commonly used knots and the percentage of load lost in the rope when the knots are used. Figure-8 - 20% Loss Bowline - 30% Loss Double Fisherman's - 35% Loss *NB Load lost will be eected by many variables and will Clove Hitch - 40% Loss change slightly each time www.theatresafe.com.au [email protected] Rope Materials Nylon - Nylon is one of the Strongest types of ropes commonly used, it is highly UV and abrasive resistant, it has a slight stretch to it which makes it good for use where the rope requires a slight give. Nylon Rope does however loose 15% of its load rating once wet. Polypropylene - Polypropylene is normally the cheapest rope to buy but this is due to the fact that the rope is not very resistant to UV or abrasive damage. Polypropylene is however very buoyant which makes it good for applications where you require the rope to sit onto of water, for example a boats reduce line. Polyester - Polyester Is one of the more expensive types of ropes, it is almost as strong as Nylon but unlike Nylon it does not loose load rating when wet nor does it stretch. Polyester is highly resistant to UV and abrasions and as such is more suited to be used as rope slings. Natural Fibres - Natural Fibers are generally are heavier, weaker and less resistant to all forms of abrasions than synthetic fabrics. Natural Fibres are not recommended for lifting large loads, they do however have some applications that they are suited for due to the size and the texture of the rope. www.theatresafe.com.au [email protected] www.theatresafe.com.au [email protected] www.facebook.com/theatresafeaustralia References www.climbing.com This product is intend for trained and competent persons and should only be considered as a guide only. www.geir.com TSA takes no responsibility for any information a person uses from this documentation. http://en.wikipedia.org http://typesofrope.com Please consulate a professional on the best product for your use.
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