Presentation on theme: "Rigging Hazard Awareness"— Presentation transcript:
1 Rigging Hazard Awareness Between the trolley hook and the load is RIGGINGRopes, Slings, ChainsSlings inspected dailyProper storage when not in useSuitable protection of rigging when in use (items with sharp corners, etc..)
2 Rules for Rigging Safety Know the weight of the loadKnow the center of gravity of the load.Make load attachment above the center of gravity of the load.Select hitch that will hold and control.Know the rated capacity of slings and hardware.
3 Rules for Rigging Safety Select sling best suited for load.Inspect all rigging before the lift.Protect sling from sharp surfacesProper calculation of increased tension caused by sling angles (on all rigging components!).
4 Rules for Rigging Safety Allow for D/d ratio on all wire rope slings.Calculate reductions when using choker hitch.Keep personnel clear from lift area.Lift load a few inches then check riggingKnow limitations of all lifting devices used.Lift slowly and stop slowly
5 Rigging equipment for material handling Rigging equipment inspections (By a Competent Person)Prior to use on each shiftAs necessary during its use to ensure that it is safeDefective rigging equipment removed from serviceNot be loaded in excess of its recommended safe working load
6 Rigging equipment for material handling Custom design grabs, hooks, clamps, or other lifting accessories, for such units as modular panels, prefabricated structures and similar materialsMarked to indicate the safe working loadsBe proof-tested prior to use to 125 percent of their rated load
7 Rigging equipment for material handling Alloy steel chainsWelded alloy steel chain slingsPermanently affixed durable identification statingSizeGradeRated capacitySling manufacturer
8 Rigging equipment for material handling Alloy steel chainsJob or shop hooks and links, or makeshift fasteners, formed from bolts, rods, etc., or other such attachments, shall not be used
9 Rigging equipment for material handling Four grades:Grade 28 General Utility ChainGrade 43 High Test ChainGrade 70 Binding ChainGrade 80 Alloy Steel Chain: The only one used for overhead liftingG 80
10 Rigging equipment for material handling Alloy steel chainsInspectionsFrequentVisual examination by the userPeriodicComplete link by link inspection of the entire sling and all attachments.Documented
11 Rigging equipment for material handling Alloy steel chainsCP inspections made & based onFrequency of sling use;Severity of service conditions;Nature of lifts being made; andExperience gained on the service life of slings used in similar circumstances.Such inspections at least once a yearDocumented & available
12 Rigging equipment for material handling Wire rope slingsProtruding ends of strands in splices on slings and bridles covered or bluntedWire rope shall not be secured by knotsExcept for eye splices in the ends of wires and for endless rope slings, each wire rope used in hoisting or lowering, or in pulling loads, shall consist of one continuous piece without knot or splice
13 Rigging equipment for material handling Mechanical Splice
14 Rigging equipment for material handling Hand Tucked Eye Splice
15 Rigging equipment for material handling Swaged Forged Eye
16 Rigging equipment for material handling Illegal Pig TailMechanical Splice
17 Rigging equipment for material handling Wire rope slingsShall not be shortened with knots or bolts or other makeshift devices.Legs shall not be kinkedBasket hitch shall have the loads balanced to prevent slippagePadded or protected from the sharp edges
18 Rigging equipment for material handling Wire ropeHands or fingers shall not be placed between the sling and its load while the sling is being tightened around the loadA sling shall not be pulled from under a load when the load is resting on the sling
19 Rigging equipment for material handling D/d RatioDdD - is diameter around which sling is bent.d - is diameter of the sling.
20 Rigging equipment for material handling When U-bolt wire rope clips used to form eyesU-bolt shall be applied so that the "U" section is in contact with the dead end of the rope“Never saddle a dead horse”
21 Rigging equipment for material handling Synthetic webbing (nylon, polyester, and polypropylene).The employer shall have each synthetic web sling marked or coded to showName or trademark of manufacturerRated capacities for the type of hitchType of materialRated capacity shall not be exceeded
22 Rigging equipment for material handling Synthetic webbing (nylon, polyester, and polypropylene)Remove from service immediately if:Acid or caustic burnsMelting or charring of anypart of the sling surfaceSnags, punctures, tearsor cutsBroken or worn stitchesDistortion of fittings
23 Rigging equipment for material handling Shackles and hooksManufacturers’ identificationNever weld on hooks or shacklesWorking safety latch on hooks
24 Rigging equipment for material handling Not RecommendedRecommendedRecommendedScrew Pin Anchor ShackleRound Pin Anchor ShackleBolt Type Anchor Shackle
25 Rigging equipment for material handling Never replace a shackle pin with a bolt.The load will bend the bolt.
26 Rigging equipment for material handling Avoid eccentric loads.Proper chocking of shackles.BadGoodBadGood
27 Rigging equipment for material handling Check cracks, bending and twistingCheck wearCheck wear and straightnessPin always seatedCheck opening width
28 Rigging equipment for material handling LOADHooks are designed to apply the load at the bottom of the saddle.
29 Rigging equipment for material handling Check for Wear and DeformationSigns of “Opening Up”Check for Cracks and Twisting15%10ºCheck that Hook is Not TwistedCheck for Wear and Cracks
31 Rigging equipment for material handling Approximately 70%-80% of a straight pull
32 Rigging equipment for material handling 90° basket hitch is approximately twice the capacity of a straight pull
33 How horizontal angle affects slings capacity 1000 LBS500 LBS577 LBS707 LBS9060°45°30°Note: A good operating practice is to keep sling angles from going below 60 degrees
34 Rigging equipment for material handling Calculating the load on sling legsDivide the total load by the number of sling legsThis quotient is the load on each leg if verticalMeasure the sling from the load attachment point, to the point where it connects with the hook or lifting device; this is ‘L’Measure the vertical height from the top of the load to the hook or lifting device; this is ‘H’Divide the length of the leg by the height of the sling
35 Load Number of legs) X (L H) = Load each sling leg
36 ExampleLoad = 120,000 pounds4 load legs ÷ 120,000 equals 30,000 pounds each leg if vertical hitchSling legs are 20 feetHeight from top of load to lifting device is 15 feet20 ÷ 15 = 1.33Load on each leg is 1.33 x 30,000 = 40,000 pounds20'15'120,000 lb.
37 Center of Gravity A load is stable when: The hook is directly above the center of gravity of the loadEstimate the center of gravityLift the load just enough to clear the groundIf the hook is not over the center of gravity the hook will travel to the center of gravityCG?
38 The longer set of sling legs (B) will improve load stability Center of GravityIf necessary, set the load down and adjust the riggingIf the load tips more than 3°, the rigging should be adjustedThe longer the sling legs, the more stable the load will beBThe longer set of sling legs (B) will improve load stabilityA
39 Disposal of waste materials Materials are dropped more than 20 feet to any point lying outside the exterior walls of the buildingenclosed chute
42 Disposal of waste materials Debris dropped through holes in the floor without the use of chutesCompletely enclosed with barricades not less than 42 inches highNot less than 6 feet back from the projected edge of the opening aboveSigns warning of falling materials shall be posted at each levelRemoval shall not be permitted in this lower area until debris handling ceases above
43 Disposal of waste materials Scrap lumber, waste material, and rubbishRemoved from the immediate work area as the work progresses.Disposal of waste material or debris by burningComply with local fire regulationsAll solvent waste, oily rags, and flammable liquidsKept in fire resistant covered containers until removed from worksite