twin-path® slings in action - Hanes Supply, Inc

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YOUR SLING AND RIGGING SPECIALISTtwin-Path ® slings7.0 - Mechanical Considerations7.21 The slings should contain or support the load from the sides above the center of gravity so that the loadwill not tilt when the load is lifted.7.22 Slings shall be of the proper length so that the angle of the sling to the load does not reduce the ratedcapacity of the sling for a given angle.7.23 Use only if trained. Read and understand tag. Only legibly marked or labeled slings must be used.If the tag is not legible, or missing, the sling must not be used.7.24 Keep labels or tags away from the load, the hook and the angle of choke.7.25 Synthetic slings should be inspected each time before each lift.8.0 - Environmental Considerations8.1 When not in use, synthetic slings should be stored in a clean dry place. Heat sources and non-ventilatedplaces should be avoided.8.2 Chemically active environments can affect the strength of synthetic lifting slings. Different chemicals willreact with different exposure to Covermax ® bulked nylon, polyester, aramids, and Olefins.Aramids are resistant to most ketones, alcohols, dry cleaning solvents and many other organic solvents. Its acidresistance is superior to that of nylon but is not as good as that of polyester. Aramids show good resistance toalkalis at room temperature, but is degraded by strong alkalis at higher temperatures.Aramids are compatible with fluorine-containing elastomers, resins, and refrigerants at high temperatures,and is resistant to fluorine compounds in concentrations usually encountered in stack gases from metallurgicaland rock-processing operations.The resistance of aramids to oxides of sulphur at temperatures above the acid dew point is superior to that ofpolyester. Below the dew point, concentrated sulphuric acid may condense on the fiber and cause a progressiveloss in strength.In moderate to strong acid or alkali environments, evaluation of aramids should be made to ensure that the yarnwill perform acceptably before use.Polyester and nylon are not significantly affected by most compounds of the following classes: Alcohols, DryCleaning Solvents, Halogenated Hydrocarbons, Ketones, Soaps and Synthetic Detergents, and Water(Including Sea Water).Polyester also shows good to excellent resistance to:• Aqueous solutions of most weak acids at the boil, and to most strong acids at room temperature,but is disintegrated by concentrated (95%) sulphuric acid at room temperature.• Aqueous solutions of strong alkalis at room temperature, but is degraded at the boil.• Oxidizing agents, and is not degraded by bleaching treatments ordinarily used for textiles.Nylon is not significantly affected by most aldehydes, alkalis, ethers, or hydrocarbons, but is deteriorated bydilute acids (e.g., hydrochloric acid and sulphuric acid in 10% concentrations at room temperature cause anoticeable loss in breaking strength in 10 hours).HEADQUARTERS: 55 James E. Casey Drive • Buffalo, NY 14206 PHONE: 716.826.2636 FAX: 716.826.4412 www.hanessupply.com20
twin-Path ® slingsYOUR SLING AND RIGGING SPECIALISTSolvents for nylon includes: Concentrated formic acid, Phenolic compounds at room temperature, Calciumchloride in methanol at room temperature.Hot solutions of calcium chloride in: Glacial Acetic Acid, Ethylene Chlorohydrin, Ethylene Glycol.Hot solutions of zinc chloride in methanol Benzyl alcohol at the boil.Aramids are resistant to most weak acids and alkalis, ketones, alcohols, hydrocarbons, oils and dry cleaningsolvents. Strong acids and bases and sodium hypo-chlorite bleach attack aramids, particularly at high temperaturesof high concentrations.K-Spec ® core yarn strength retention is based on test results of components at 65°C/150°F (or less) for 6months. K-Spec ® has a 100% strength retention when exposed to: Age,10% detergent solution, rot and mildew,sunlight and Toluene; 99% strength retention when exposed to: acetic acid, gasoline, hydrochloric acid 1m, hydraulicfluid, kerosene, and sea water; 98% retention when exposed to: 25% ammonium hydroxide, 10% hypophosphitesolution, and 40% phosphoric acid; 97% retention when exposed to 5m sodium hydroxide; 95%retention when exposed to Portland cement and sulfuric acid; and 88% retention when exposed to Clorox , ® andnitric acid.9.0 - Fiber Characteristics(Using Nylon as a basis of 1.0)Generic Fiber Polypro- HDPEType Nylon Polyester Pylene Olefin Aramid K-Spec ®Bulk Strength 1 1.0 .9- 1.1 .55 2.8 2.7 2.75Weight 1.0 1.21 .80 .85 1.26 1.01Working 2 Elastic 1.0 .60 .80 .10 .10 .10ElongationCo-efficient 3 of .10 -.12 .12-.15 .15 - .22 .08 .10 - .12 .10FrictionChars at Chars atMelting Point 460°F 480°F 330°F 297°F 800°F 297°FCritical 4 Temperature 180°F 180°F 180°F 150°F 300°F 180°FSpecific Gravity 1.14 1.38 .91 .97 1.44 1.2Cold-Flow (Creep) 5 Negligible Negligible Negligible Negligible Negligible Negligibleto High to High1Bulk Strength is defined as strength per circumference squared.2Working is defined as rope actually in use under a cycling load.3Co-efficient of friction is based on reluctance to slip or slide.4Critical temperature is defined as the point at which degradation is caused by temperature alone.5Cold-Flow (Creep) is defined as fiber deformation (elongation) due to molecular slippage under a constant steady static loadingsituation. Fibers that have this inherent characteristic will display extremely low or negligible creep if minor fluctuations occurin the rate and/or frequency of load levels. In rope form, this would apply to polypropylene, polyethylene, and HDPE Olefin fibers.HEADQUARTERS: 55 James E. Casey Drive • Buffalo, NY 14206 PHONE: 716.826.2636 FAX: 716.826.4412 www.hanessupply.com21
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