Safe Slinging Practices www prothermindia com Types of

Safe Slinging Practices www. prothermindia. com

Types of Slings 1) Wire Rope Slings 2) Chain Slings 3) Synthetic Web Slings www. prothermindia. com

Ropes, chains, and slings • Primary hazard is structural failure due to: – Overloading (“the weakest link”) – Deterioration and/or wear – Environmental exposure – Improper rigging – Abuse www. prothermindia. com

Natural fibre ropes IS: 1084— 1969 Manila Rope IS: 1321— 1970 Sisal Rope MANILA — Black Yarn Grade-I SPECIAL QUALITY ALL THE THREE STRANDS Grade-II STANDARD QUALITY ALL THE TWO STRANDS Grand-III MERCHANT QUALITY ONE STRAND SISAL Red or Green YARN in one strand www. prothermindia. com

SWL of Fibre ropes Value Condition ONE Rope of which original Same as per new Fibre strength is not Rope reduced TWO Rope which has been 80% of the New used and shows slight external wear and chafe THREE Rope which has fair NOT TO BE USED amount of usage, clear FOR HOISTING indication of internal and external wear, loosening of strands www. prothermindia. com SWL

Fibre ropes Once a Fibre Rope is condemned it should be cut with a knife so as to ensure that it should not be used again. www. prothermindia. com

Fibre ropes Causes of Deterioration ROUGH USE Rubbing against sharp edges Damaged groves of sheaves Dragging from under the load HARMFUL CONTACT With water, oil, chemicals and heat BAD STORAGE Heap on wet floor, poorly ventilated godown Internal wear by Repeated Flexing www. prothermindia. com

Synthetic Fibre ropes IS: 4572– 1968 Polyamide (Nylon Filament Rope) IS: 5175– 1969 Poly Propylene Rope IS: 8674– 1978 Polyethylene Rope Advantages • Light in Weight • Higher Strength • Increased Resistance to Repeated Bending, Flexing and Abrasion • Resistance to water and • Choice of Selection www. prothermindia. com

Wire Rope and Wire Rope Slings Components of Wire Rope www. prothermindia. com

Left Lay Right Lay www. prothermindia. com

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Crushing Because of loose winding on drum, rope was pulled in between underlying wraps and crushed out of shape. www. prothermindia. com

Birdcaging The sudden release of a load cause birdcaging. Here individual strands open away from each other, displacing the www. prothermindia. com core.

Locking of strands Premature breakage of wires resulted from "locking" of strands, which was caused by insufficient lubrication. www. prothermindia. com

Abrasion Neglect of periodical inspection left this rope in service too long, resulting in considerable abrasion. www. prothermindia. com

Kinking Kink or "dog leg“ was caused by improper handling and/or installation. A kink causes excessive localized or spot abrasion. www. prothermindia. com

Reverse bending Running this rope over one sheave and under another caused fatigue breaks in wires. www. prothermindia. com

Pitting Too much exposure combined with surface wear and loss of lubrication caused corrosion and pitting. . www. prothermindia. com

Wear Too long in service. Repeated winding and overwinding of this rope on a drum while it was under heavy stress caused the unusually severe wear. www. prothermindia. com

Wire Rope Sling Identification Rated Load (rated capacity) • Load test date • Manufacturer’s name • Periodic inspection due date • Broken wires (10 in one lay or 5 in one strand) • Severe corrosion • Localized wear • Reduction in outer wire • Damaged end fittings • Distortion, kinking, etc… www. prothermindia. com

Wire rope – Permissible Stretch 6 strand wire rope 6 in. for 100 ft. length 8 strand wire rope 9 to 10 in. for 100 ft. length www. prothermindia. com

Wire rope Dia of rope Permissible reduction in dia. (inch) 3/4 3/64 7/8 to 11/8 1/16 11/4 to 11/2 3/32 www. prothermindia. com

Wire Rope Slings single-rope legs www. prothermindia. com

Wire Rope Slings sling with single-rope legs, Torpedo loop-locks and choker hook www. prothermindia. com

TWO LEGGED BRIDLE SLINGS www. prothermindia. com

THREE LEGGED BRIDLE SLINGS www. prothermindia. com

FOUR LEGGED BRIDLE SLINGS www. prothermindia. com

Chain and Chain Sling Parts of Chain Sling www. prothermindia. com

Chain and Chain Sling Single Chain Sling www. prothermindia. com

Chain and Chain Sling Double Chain Sling www. prothermindia. com

Chain and Chain Sling Triple & Quadruple Chain Sling www. prothermindia. com

Chain and Chain Sling Adjustable Chain Sling www. prothermindia. com

Chain Sling Identification • Chain Size • Manufacturers Grade • Rated load angle • Reach • Number of legs • Manufacturers name and trademark • Next inspection www. prothermindia. com

What should you avoid while using chain slings? • impact loading: do not jerk the load when lifting or lowering the sling. This increases the actual stress on the sling. • Do not drag chains. • Do not splice a chain by inserting a bolt between two links. • Do not shorten a chain with knots or by twisting. • Do not force a hook over a link. • Do not use homemade connections. Use only attachments designed for the chain. • Do not heat treat or weld chain links: the lifting www. prothermindia. com capacity will be reduced drastically.

Various defects in chain slings Wear Cut Twist or Bend Stretched Links www. prothermindia. com

Periodical inspection • Clean sling before inspection. • Hang the chain up or stretch the chain out on a level floor in a well-lighted area. Remove all twists. Measure the sling length. Discard if a sling has been stretched. • Make a link-by-link inspection and discard if a. Wear exceeds 15% of a link diameter. b. Cut, , cracked, , burned, or corrosion pitted c. Twisted or bent d. Stretched-- Links tend to get longer www. prothermindia. com

Chain Sling Inspection Items ü Cracks, stretches, or deformed master links, coupling links, chains or other components. ü One leg of a double or triple chain sling is longer than the others. ü Hooks have been opened more than 15% of the normal throat opening measured at the narrowest point or twisted more than 10 degrees from the plane of the unbent hook. ü Chain size at any point of any link is less than stated in the chart on the next slide, the sling shall be removed. www. prothermindia. com

Chain Slings Only chain slings purchased from the manufacturer are allowed. No homemade slings allowed!! www. prothermindia. com

Special Precautions • It is important to realize that the capacity of a sling decreases as the angle at which it is used to lift increases. www. prothermindia. com

Rigging Devices • Shackles • Hooks • Wire Rope Clips • Wedge Sockets • Eyebolts • Spreader Beams • Slings www. prothermindia. com

Shackles Recommended Not Recommended www. prothermindia. com

Proper Use of Shackles Never replace a shackle pin with a bolt The load will bend the bolt www. prothermindia. com

Avoid eccentric loads Bad Good www. prothermindia. com

Proper chocking of shackles. Bad Good www. prothermindia. com

Shackle Inspection www. prothermindia. com

Hooks • Manufacturers’ identification. • Never weld on hooks. • Working safety latch. www. prothermindia. com

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Wire Rope Clips • The most common use of wire rope clips on cranes is at wedge and socketend fittings. • The clip does not provide strength to the wedge and socket connection. • It is there to prevent the wedge from accidentally being released. www. prothermindia. com

Installing Wire Rope Clips Installed properly as to number, direction, spacing and torque. www. prothermindia. com

Wedge Sockets • Most common method of terminating ropes on cranes. • All parts must match in size. • Measure rope diameter to ensure proper size. www. prothermindia. com

Wedge Socket - Correct Rope Installation • Live end of the rope, the straight side of the socket and the pinhole all line up. www. prothermindia. com

WINDING WIRE ROPE www. prothermindia. com

Rigging Basic Rules of Rigging • Know the Weight • Know the Capacity www. prothermindia. com

HITCHES STRAIGHT PULL www. prothermindia. com

HITCHES CHOCKER HITCH www. prothermindia. com

HITCHES BASKET HITCH www. prothermindia. com

• Marked with the capacity and proof tested to 125 percent of that capacity. • Load should not be left suspended or unattended www. prothermindia. com

How Horizontal Angle Affects Sling Capacity Note: A good operating practice is to keep sling angles from going below 60 degrees www. prothermindia. com

Sling Angle Factor = L/H Where: L = Length of the sling. H = Height of the connection point from the horizontal plane of the load. www. prothermindia. com

Sling Angles www. prothermindia. com

Hook load increases on brake application during lowering Loading lowering Stopping distance (ft) speed (ft/ min) 10 5 2 100 0. 4 0. 7 2. 2 150 1. 6 4. 9 Increase in hook 200 1. 7 2. 9 8. 6 load 250 2. 7 4. 5 13. 5 (%) 300 3. 9 6. 5 19. 4 350 5. 3 8. 8 26. 4 450 6. 9 11. 5 34. 5 Avoid rapid acceeration or deceleration of load www. prothermindia. com

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Hand Signals An illustration of the signals must be posted at the job site www. prothermindia. com

Sheave grooves may become grooved if cable’s nominal diameter is reduced, indicating wear. www. prothermindia. com

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Safe Usage Practices v Slings should be stored off the floor and hung on racks whenever possible in a clean, dry environment. v Never drag slings across the floor. www. prothermindia. com

Safe Usage Practices (Cont. ) v Never shock load slings. v Keep loads balanced to prevent overloading slings. v A sling should not be pulled from under a load when the load is resting on the sling. v Make sure the hook is always over the center of gravity of the load before lifting it. v Always lift loads straight up. v Never rest a load on a sling, or v Do not apply a load to a twisted, knotted or kinked pinch a sling between the load chain. and the floor. v Do not force or hammer hooks or chains into position. www. prothermindia. com

Safe Usage Practices (Cont. ) • Hands and Fingers shall • Never shorten a sling with not be placed between the knots, bolts or other sling and the load while makeshift devices. the sling is being tightened around the load. • Protect the chain’s surface from contact with sharp • Clean chains regularly as corners, which can cause dirt and grit can cause permanent damage excessive wear at the link through gouging or bearing points. abnormal stress and wear. www. prothermindia. com

Ropes, chains, and slings • Factors affecting load capacity – Hitch type – Leg angle from vertical • Other issues – Hook deformation (maximum 10° twist, 15% throat opening) – Rope wear • Consider replacement if more than 12 randomly distributed broken wires within a single strand within a single lay (ANSI B 30. 2) – Chain deformation www. prothermindia. com

Ropes, chains, and slings • Selected controls – Proper selection of rigging materials – Proper use – Keeping loads within limits – Regular inspection/testing of rigging components – Training of riggers • Other issues – Hook retainers – Load capacity charts for field use www. prothermindia. com

Review ÆSelect the right sling for the job. ÆInspect slings prior to use, removing from service any in question. ÆRemember the effect of sling angles on load capacities. ÆProperly store slings when finished to avoid damage. www. prothermindia. com

Conclude · Associates in the direction of travel should be warned to move and remain clear of a lifted load at all times. · Loads should not be suspended over personnel below. · Under no circumstances may anyone ride the hook or load. · Directional movement should be made smoothly and deliberately. Avoid rapid movements in any direction. www. prothermindia. com

Conclude ·Locate the hoist directly above the lifting point of the load before lifting. ·Lower loads directly below the hoist. ·Keep hoisting ropes vertical. Do not pull or push the load. · Maintain two full wraps of cable on the hoisting drum. · Never pull a hoist by the pendant cable www. prothermindia. com

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