Rigging Information - Western Sling USERS GUIDE FOR LIFTIN… · rigging information center of...

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USERS GUIDE FOR LIFTING ASME VERSION (12/14)

RISK MANAGEMENT TERMINOLOGY FOR ADDITIONALSUPPORTDEFINITION WORKING LOAD LIMIT (WLL)

COMPREHENSIVE SET OF ACTIONS THATREDUCES THE RISK OF A PROBLEM, A

FAILURE, AN ACCIDENT

THE MAXIMUM MASS OR FORCE WHICH THEPRODUCT IS AUTHORIZED TO SUPPORT IN A

PARTICULAR SERVICE.

P.O. Box 3128Tulsa Oklahoma 74101Phone: (918) 834-4611

1-800-777-1555

Web:www.thecrosbygroup.com

E-Mail:[email protected]

CROSBY® FITTINGS LEBUS® McKISSICK®

WESTERN NATIONAL

ASME B30.9 REQUIRES THAT SLINGUSERS SHALL BE TRAINED IN THESELECTION, INSPECTION, CAUTIONS TOPERSONNEL, EFFECTS OF ENVIRONMENT,AND RIGGING PRACTICES. SLINGIDENTIFICATION IS REQUIRED ON ALLTYPES OF SLINGS.

ASME B30.26 REQUIRES THAT RIGGINGHARDWARE USERS SHALL BE TRAINED INTHE SELECTION, INSPECTION, CAUTIONSTO PERSONNEL, EFFECTS OFENVIRONMENT, AND RIGGING PRACTICES.ALL RIGGING HARDWARE TO BEIDENTIFIED BY MANUFACTURER WITHNAME OR TRADEMARK OFMANUFACTURER.

REFER TO THE CROSBY GROUP CATALOGAND OTHER PRODUCT APPLICATIONINFORMATION.

PROOF TESTA TEST APPLIED TO A PRODUCT SOLELYTO DETERMINE INJURIOUS MATERIAL OR

MANUFACTURING DEFECTS.

ULTIMATE STRENGTHTHE AVERAGE LOAD OR FORCE AT WHICH

THE PRODUCT FAILS OR NO LONGERSUPPORTS THE LOAD.

DESIGN FACTORAN INDUSTRIAL TERM DENOTING A PRODUCT’STHEORETICAL RESERVE CAPABILITY; USUALLY

COMPUTED BY DIVIDING THE CATALOG ULTIMATELOAD BY THE WORKING LOAD LIMIT. GENERALLY

EXPRESSED AS A RATIO, e.g. 5 TO 1.

1

BLOCKS & FITTINGSFOR WIRE ROPE & CHAIN

THE BASIC RIGGING PLAN RESPONSIBILITY 2PLAN EVERY LIFT, INCLUDE THE FOLLOWING QUESTIONS WITH THE QUESTIONS YOUR EXPERIENCE PROVIDES:

1. WHO IS RESPONSIBLE (COMPETENT) FOR THE RIGGING?2. HAS COMMUNICATION BEEN ESTABLISHED?3. IS THE RIGGING IN ACCEPTABLE CONDITION?4. IS THE RIGGING APPROPRIATE FOR LIFTING?5. DOES THE RIGGING HAVE PROPER IDENTIFICATION?6. DOES ALL GEAR HAVE KNOWN WORKING LOAD LIMITS?7. WHAT IS THE WEIGHT OF THE LOAD?8. WHERE IS THE LOAD’S CENTER OF GRAVITY?9. WHAT IS THE SLING ANGLE?10. WILL THERE BE ANY SIDE OR ANGULAR LOADING?11. ARE THE SLINGS PADDED AGAINST CORNERS, EDGES,

PROTRUSIONS AND ABRASIVE SURFACES?12. ARE THE WORKING LOAD LIMITS ADEQUATE?13. IS THE LOAD RIGGED TO THE CENTER OF GRAVITY?14. IS THE HITCH APPROPRIATE FOR THE LOAD?15. IS A TAG LINE REQUIRED TO CONTROL THE LOAD?16. WILL PERSONNEL BE CLEAR OF SUSPENDED LOADS?17. IS THERE ANY POSSIBILITY OF FOULING?18. WILL THE LOAD LIFT LEVEL AND BE STABLE?19. ANY UNUSUAL ENVIRONMENTAL CONCERNS?20. ANY SPECIAL REQUIREMENTS?

THE RIGGING MUST BE USED WITHIN MANUFACTURER’S RECOMMENDATIONS AND INDUSTRY STANDARDS THAT INCLUDE OSHA, ASME, ANSI, API AND OTHERS.

USER RESPONSIBILITY1. UTILIZE APPROPRIATE RIGGING GEAR SUITABLE FOR

OVERHEAD LIFTING.2. UTILIZE THE RIGGING GEAR WITHIN INDUSTRY

STANDARDS AND THE MANUFACTURER’S RECOMMENDATIONS.

3. CONDUCT REGULAR INSPECTION AND MAINTENANCEOF THE RIGGING GEAR.

4. PROVIDE EMPLOYEES WITH TRAINING TO MEET OSHA, API AND ASME (B30.9, B30.26, ETC.) REQUIREMENTS.

MANUFACTURERS RESPONSIBILITY1. PRODUCT AND APPLICATION INFORMATION2. PRODUCT THAT IS CLEARLY IDENTIFIED

NAME OR LOGOLOAD RATING AND SIZE TRACEABILITY

3. PRODUCT PERFORMANCEWORKING LOAD LIMITDUCTILITYFATIGUE PROPERTIES IMPACT PROPERTIES

4. PRODUCT TRAININGAND TRAINING RESOURCES

Copyright © 2016 The Crosby Group LLC All Rights Reserved470

Rigging Information

INSPECTION OF RIGGING HARDWARE 3INSPECTION FREQUENCY PER ASME B30.26

A VISUAL INSPECTION SHALL BE PERFORMED BY THE USER OR DESIGNATED PERSON EACH DAY BEFORE THE RIGGING HARDWARE IS USED.A PERIODIC INSPECTION SHALL BE PERFORMED BY A DESIGNATED PERSON, AT LEAST ANNUALLY. THE RIGGING HARDWARE SHALL BEEXAMINED AND A DETERMINATION MADE AS TO WHETHER THEY CONSTITUTE A HAZARD. WRITTEN RECORDS ARE NOT REQUIRED.SEMI-PERMANENT AND INACCESSIBLE LOCATIONS WHERE FREQUENT INSPECTIONS ARE NOT FEASIBLE SHALL HAVE PERIODIC INSPECTIONS PERFORMED.

REJECTION CRITERIA PER ASME B30.26MISSING OR ILLEGIBLE MANUFACTURER’S NAME OR TRADEMARK AND/OR RATED LOAD IDENTIFICATION (OR SIZE AS REQUIRED) A 10% OR MORE REDUCTION OF THE ORIGINAL DIMENSION BENT, TWISTED, DISTORTED, STRETCHED, ELONGATED, CRACKED OR BROKEN LOAD BEARING COMPONENTSEXCESSIVE NICKS, GOUGES, PITTING AND CORROSION INDICATIONS OF HEAT DAMAGE INCLUDING WELD SPATTER ORARC STRIKES, EVIDENCE OF UNAUTHORIZED WELDING LOOSE OR MISSING NUTS, BOLTS, COTTER PINS, SNAP RINGS, OR OTHER FASTENERS AND RETAINING DEVICES UNAUTHORIZED REPLACEMENT COMPONENTS OR OTHER VISIBLE CONDITIONS THAT CAUSE DOUBT AS TO THE CONTINUED USE OF THE SLING

ADDITIONALLY INSPECT WIRE ROPE CLIPS FOR:

1. INSUFFICIENT NUMBER OF CLIPS2. INCORRECT SPACING BETWEEN CLIPS3. IMPROPERLY TIGHTENED CLIPS4. INDICATIONS OF DAMAGED WIRE ROPE OR WIRE ROPE SLIPPAGE5. IMPROPER ASSEMBLY

ADDITIONALLY, INSPECT WEDGE SOCKETS FOR: 1. INDICATIONS OF DAMAGED WIRE ROPE OR WIRE ROPE SLIPPAGE2. IMPROPER ASSEMBLY

ADDITIONAL REJECTION CRITERIA PER ASME B30.10 - HOOKS• ANY VISIBLY APPARENT BEND OR TWIST FROM THE PLANE OF THE UNBENT HOOK• ANY DISTORTION CAUSING AN INCREASE IN THROAT OPENING OF 5%, NOT TO EXCEED 1/4”• MISSING OR ILLEGIBLE RATED LOAD IDENTIFICATION.• MISSING OR ILLEGIBLE HOOK MANUFACTURER’S IDENTIFICATION OR SECONDARY MFG. IDENTIFICATION

INSPECTION OF SLINGS 4INSPECTION FREQUENCY PER ASME B30.9

A VISUAL INSPECTION FOR DAMAGE SHALL BE PERFORMED BY THE USER OR DESIGNATED PERSON EACH DAY OR SHIFT THE SLING IS USED. A COMPLETE INSPECTION FOR DAMAGE SHALL BE PERFORMED PERIODICALLY BY A DESIGNATED PERSON, AT LEAST ANNUALLY.WRITTEN RECORDS OF MOST RECENT PERIODIC INSPECTION SHALL BE MAINTAINED.

REJECTION CRITERIA PER ASME B30.9MISSING OR ILLEGIBLE SLING IDENTIFICATION; EVIDENCE OF HEAT DAMAGE; SLINGS THAT ARE KNOTTED; FITTINGS THAT ARE PITTED, CORRODED, CRACKED, BENT, TWISTED, GOUGED, OR BROKEN; OTHER CONDITIONS, INCLUDING VISIBLE DAMAGE, THAT CAUSE DOUBT AS TO THE CONTINUED USE OF THE SLING.

WIRE ROPE SLINGSEXCESSIVE BROKEN WIRES, FOR STRAND-LAID AND SINGLE PART SLINGS, TEN RANDOMLY DISTRIBUTED BROKEN WIRES IN ONE ROPE LAY OR FIVE BROKEN WIRES IN ONE STRAND IN ONE ROPE LAYSEVERE LOCALIZED ABRASION OR SCRAPING, KINKING, CRUSHING, BIRDCAGINGANY OTHER DAMAGE RESULTING IN DAMAGE TO THE ROPE STRUCTURESEVERE CORROSION OF THE ROPE OR END ATTACHMENTS

CHAIN SLINGSCRACKS OR BREAKSEXCESSIVE WEAR, NICKS OR GOUGESSTRETCHED CHAIN LINKS OR COMPONENTSBENT, TWISTED OR DEFORMED CHAIN LINKS OR COMPONENTSEXCESSIVE PITTING OR CORROSIONLACK OF ABILITY OF CHAIN OR COMPONENTS TO HINGE FREELYWELD SPATTER

WEB SLINGSACID OR CAUSTIC BURNSMELTING OR CHARRING OF ANY PART OF THE SLINGHOLES, TEARS, CUTS OR SNAGSBROKEN OR WORN STITCHING IN LOAD BEARING SPLICESEXCESSIVE ABRASIVE WEAR DISCOLORATION AND BRITTLEOR STIFF AREAS ON ANY PART OF THE SLING, WHICHMAY MEAN CHEMICAL OR ULTRAVIOLET / SUNLIGHT DAMAGE

ROUND SLINGSACID OR CAUSTIC BURNS

EVIDENCE OF HEAT DAMAGEHOLES, TEARS, CUTS, ABRASIVE WEAR OR SNAGS THAT EXPOSE THE CORE YARNSBROKEN OR DAMAGED CORE YARNSWELD SPATTER THAT EXPOSES CORE YARNSDISCOLORATION AND BRITTLE OR STIFF AREAS ON ANY PART OF THE SLINGS, WHICH MAY MEAN CHEMICAL OR OTHER DAMAGE


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WIRE ROPE SLING CONNECTIONS AND HITCHES 6CONNECTION TO FITTINGS CHOKER CAPACITY

USE A THIMBLE TOPROTECT SLINGAND INCREASE D/d

NEVER PLACE EYEOVER A FITTINGWITH SMALLERDIAMETER ORWIDTH THAN THEROPE’S DIAMETER.

NEVER PLACE ASLING EYE OVER AFITTING WITH ADIAMETER ORWIDTH GREATERTHAN ONE HALFTHE LENGTHOF THE EYE.

A CHOKER HITCH HAS75% OF THE CAPACITYOF A SINGLE LEG SLINGONLY IF THE ANGLE OFCHOKE IS 120 DEGREESOR GREATER. A CHOKEANGLE LESS THAN 120DEGREES CAN RESULTIN A CAPACITY AS LOWAS 40% OF THE SINGLELEG.

BASKET HITCH CAPACITY MULTIPLE LEG SLINGS

A BASKET HITCH HAS TWICETHE CAPACITY OF A SINGLELEG ONLY IF D/d RATIO IS 25/1AND THE LEGS ARE VERTICAL.

CAPACITY % OF ANGLE SINGLE LEG

90 200%

60 170%

45 140%

30 100%

TRIPLE LEG SLINGS HAVE 50% MORE CAPACITY THAN DOUBLE LEG SLINGS (AT SAME SLING ANGLE) ONLY IF THE CENTER OF GRAVITY IS IN CENTER OF CONNECTION POINTS AND LEGS ARE ADJUSTED PROPERLY. THEY MUST HAVE AN EQUAL SHARE OF THE LOAD.

QUAD (4 LEG) SLINGS OFFER IMPROVEDSTABILITY BUT PROVIDE INCREASED CAPACITY ONLY IF ALL LEGS SHARE AN EQUAL SHARE OF THE LOAD.

L

d

D

ANGLE

CHAIN SLING CONNECTIONS AND HITCHES 7A CONNECTION TO FITTINGS CHOKER CAPACITY

USE MASTER LINKS TO COLLECT SLINGS AND TO CONNECT TO HOOK

USE GRADE 8 (80) OR GRADE 10 (100) FITTINGS THAT MATCH THE WLL OF CHAIN AND OFFER PROPER SECUREMENT.

A CHAIN CHOKER HITCH HAS 80% OF THE CAPACITY OF A SINGLE LEG SLING ONLY IF THE ANGLE OF CHOKEIS 120 DEGREES OR GREATER. RATED LOADS FOR ANGLESOF CHOKE LESS THAN 120 DEGREES SHALL BEDETERMINED BY THE SLING MFGOR A QUALIFIED PERSON.NO LOSS IN CAPACITY RESULTS IF A CRADLE GRAB HOOK IS USEDWHEN ANGLE OF CHOKEIS 120 DEGREES OR GREATER

BASKET HITCH CAPACITY MULTIPLE LEG SLINGSA TRUE BASKET HITCH HAS TWICE THE CAPACITY OF A SINGLE LEG ONLY IF THE LEGS ARE VERTICAL. NOTE THAT THE BASKET IS FORMED BY USING A CHAIN SLING WITH TWO MASTERLINKS AT EACH END CONNECTED TO THE HOOK.

HORIZONTAL CAPACITY % OFANGLE SINGLE LEG

90 200%

60 170%

45 140%

30 100%

TRIPLE LEG CHAIN SLINGS HAVE 50% MORE CAPACITY THAN DOUBLE LEG CHAIN SLINGS (AT SAME SLING ANGLE) ONLY IF THE CENTER OF GRAVITY IS IN THE CENTER OF THE CONNECTION POINTS AND LEGS ARE ADJUSTED PROPERLY. THEY MUST HAVE AN EQUAL SHARE OF THE LOAD.

QUAD (4 LEG) CHAIN SLINGS OFFER IMPROVED STABILITY, BUT DO NOT PROVIDE INCREASED CAPACITY. THE CAPACITY OF A FOUR LEG CHAIN SLING IS CONSIDERED THE SAME AS THREE LEG CHAIN SLING.


Rigging Information

CENTER OF GRAVITY AND SLING LOADING WEIGHTS AND MEASURES 10

WHEN LIFTING VERTICALLY, THE LOAD WILL BE SHARED EQUALLY IF THE CENTER OF GRAVITY IS PLACED EQUALLY BETWEEN THE PICK POINTS.

IF THE WEIGHT OF THE LOAD IS 10,000 LBS., THEN EACH SLING WILL HAVE A LOADOF 5,000 LBS. AND EACH SHACKLE AND EYEBOLT WILL ALSO HAVE A LOAD OF 5,000 LBS.

3UNIT WEIGHT STEEL = 490 LBS/FT

3UNIT WEIGHT ALUMINUM = 165 LBS/FT

3UNIT WEIGHT CONCRETE = 150 LBS/FT

3UNIT WEIGHT WOOD = 50 LBS/FT

3UNIT WEIGHT WATER = 62 LBS/FT

3UNIT WEIGHT SAND AND GRAVEL = 120 LBS/FT

3UNIT WEIGHT COPPER = 560 LBS/FT

3UNIT WEIGHT OIL = 58 LBS/FT

1 CUBIC FT. = 7.5 GALS 1/2 INCH = 12.7 mm1 METRIC TON = 1.1 US TONS 1 INCH = 25.4 mm1 KILOGRAM = 2.2 LBS

CENTER OF GRAVITY AND SLING LOADINGWHEN THE CENTER OF GRAVITYIS NOT EQUALLY SPACED BETWEEN THE PICK POINTS, THE SLING AND FITTINGS WILL NOT CARRY AN EQUAL SHARE OF THE LOAD. THE SLING CONNECTED TO THE PICK POINT CLOSEST TO THE CENTER OF GRAVITY WILL CARRY THE GREATEST SHAREOF THE LOAD.

SLING 2 IS CLOSEST TO COG. IT WILL HAVE THE GREATEST SHARE OF THE LOAD.

SLING 2 = 10,000 X 8 / (8+2) = 8,000 LBS. SLING 1 = 10,000 X 2 / (8+2) = 2,000 LBS.

VOLUME OF RECTANGLE = HEIGHT x WIDTH x LENGTH

HEIGHTWIDTH

VOLUME OF SPHERE =3.14 x (DIAM. x DIAM. x DIAM.) / 6

DIAMETER VOLUME OF CYLINDER =3.14 x (DIAM. x DIAM. x LENGTH) / 4

HEIGHT

WIDTH

LENGTH

WEB SLING AND ROUNDSLING CAPACITIES 9WEB SLING IDENTIFICATION INCLUDES: ROUNDSLING IDENTIFICATION INCLUDES: SLING TYPE: TC - TRIANGLE CHOKER TT - TRIANGLE TRIANGLE EE - EYE AND EYE EN - ENDLESS NUMBER OF PLIES: 1 OR 2

WEBBING GRADE: 9 OR 6SLING WIDTH (INCHES)

EE 2-9 04 X 12 SLING LENGTH (FEET)

SLING NUMBER: 1-13SLING NUMBERS ARE FOR REFERENCEONLY, SOME ROUNDSLINGS HAVEDIFFERENT RATINGS.

SLING COLOR: PURPLE, GREEN, YELLOW,TAN, RED, WHITE, BLUE, ORANGESLING COLOR IS NOT FOLLOWED BY ALL MANUFACTURERS AND SOME COLORS HAVE MORE THAN ONE RATED LOAD.

FOLDING, BUNCHING, OR PINCHINGOF SYNTHETIC SLINGS, WHICH OCCURS WHEN USED WITH SHACKLES, HOOKS OR OTHER APPLICATION WILL REDUCETHE RATED LOAD.

CHOKER CAPACITY BASKET HITCH CAPACITY MULTIPLE LEG SLINGSA CHOKER HITCH HAS 80% OF THE CAPACITYOF A SINGLE LEG SLINGONLY IF THE ANGLE OFCHOKE IS 120 DEGREESOR GREATER. A CHOKEANGLE LESS THAN 120DEGREES WILLRESULT IN A CAPACITY ASLOW AS 40% OFTHE SINGLE LEG.

HORIZONTAL CAPACITY % OFANGLE SINGLE LEG90 200%

60 170%

45 140%

30 100%

A TRUE BASKET HITCH HAS TWICE THECAPACITY OF A SINGLE LEG ONLY IF THE LEGSARE VERTICAL

TRIPLE LEG SLINGS HAVE 50% MORE CAPACITY THAN DOUBLE LEG SLINGS (AT SAME SLING ANGLE) ONLY IF THE CENTER OF GRAVITY IS IN THE CENTER OF CONNECTION POINTS AND LEGS ARE ADJUSTED PROPERLY. THEY MUST HAVE AN EQUAL SHARE OF THE LOAD.

QUAD (4 LEG) SLINGS OFFER IMPROVED STABILITY BUT PROVIDE INCREASED CAPACITY ONLY IF ALL LEGS SHARE AN EQUAL SHARE OF THE LOAD.

NEVER PLACE A SYNTHETIC SLING EYE OVER A FITTING WITH A DIAMETER OR WIDTH GREATER THAN ONE THIRD THE LENGTH OF THE EYE.

BUNCHING PINCHING


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Rigging Information

OPERATING PRACTICES - ASME B30.9 LOAD CONTROL 15WHENEVER ANY SLING IS USED, THE FOLLOWING PRACTICES SHALL BEOBSERVED.

1. SLINGS THAT ARE DAMAGED OR DEFECTIVE SHALL NOT BE USED.2. SLINGS SHALL NOT BE SHORTENED OR LENGTHENED BY KNOTTING

OR TWISTING.3. SLING LEGS SHALL NOT BE KINKED.4. THE RATED LOAD OF THE SLING SHALL NOT BE EXCEEDED.5. SLINGS USED IN A BASKET HITCH SHALL HAVE THE LOADS

BALANCED TO PREVENT SLIPPAGE.6. SLINGS SHALL BE SECURELY ATTACHED TO THEIR LOAD.7. SLINGS SHALL BE PROTECTED FROM EDGES, CORNERS,

PROTRUSIONS AND ABRASIVE SURFACES TO PREVENT SLINGDAMAGE.

8. DURING LIFTING, WITH OR WITHOUT LOAD, PERSONNEL SHALL BEALERT FOR POSSIBLE SNAGGING.

9. ALL EMPLOYEES SHALL BE KEPT CLEAR OF LOADS ABOUT TO BELIFTED AND OR SUSPENDED LOADS.

10. HANDS OR FINGERS SHALL NOT BE PLACED BETWEEN THE SLING AND ITS LOAD WHILE THE SLING IS BEING TIGHTENED AROUND THELOAD.

11. SHOCK LOADING SHOULD BE AVOIDED.12. A SLING SHALL NOT BE PULLED FROM UNDER A LOAD WHEN THE

LOAD IS RESTING ON THE SLING.

INSPECTION: EACH DAY BEFORE BEING USED, THE SLING AND ALLFASTENINGS AND ATTACHMENTS SHALL BE INSPECTED FOR DAMAGE OR DEFECTS BY A COMPETENT PERSON DESIGNATED BY THE EMPLOYER.ADDITIONAL INSPECTIONS SHALL BE PERFORMED DURING SLING USEWHERE SERVICE CONDITIONS WARRANT. DAMAGED OR DEFECTIVESLINGS SHALL BE IMMEDIATELY REMOVED FROM SERVICE.

POSITIVE LOADCONTROL

REEVING THROUGH CONNECTIONS TO LOADINCREASES LOAD ON CONNECTION FITTINGS BY AS

MUCH AS TWICE.DO NOT REEVE!

SLING ANGLES 11TWO LEGGED SLING - WIRE ROPE, CHAIN, SYNTHETICS

VERTICAL SHARE OF LOAD ON SLINGS ARE EQUAL IF CENTER OF GRAVITY IS IN THE MIDDLEBETWEEN PICK POINTS

HORIZONTAL SLING ANGLE L

H

HORIZONTAL SLING LOAD ANGLE ANGLE (A) DEGREE FACTOR = L/H

90 1.000 60 1.155 50 1.305 45 1.414 30 2.000

LOAD ON EACH LEG OF SLING =VERTICAL SHARE OF LOAD X LOAD ANGLE FACTOR

LOAD ON SLING CALCULATEDTENSION 1 = LOAD X D2 X S1/(H(D1+D2)) TENSION 2 = LOAD X D1 X S2/(H(D1+D2))

HORIZONTAL SLING ANGLES OF LESS THAN 30 DEGREES ARE NOT

RECOMMENDED REFER TO ASME B30.9 FOR FULL

INFORMATION

LOAD ON SLING CALCULATEDTENSION 1 = LOAD X D2 X S1/(H(D1+D2)) TENSION 2 = LOAD X D1 X S2/(H(D1+D2))

D1D2

H

CG

H

D1 D2

S1S2

H


Rigging Information

BLOCK SELECTION AND APPLICATION GUIDE 1RISK MANAGEMENT MECHANICAL ADVANTAGE AND TOTAL LOAD

COMPREHENSIVE SET OF ACTIONSTHAT REDUCES THE RISK OF A

PROBLEM, A FAILURE, AN ACCIDENT

MECHANICAL ADVANTAGEIS THE LEVERAGEGAINED BY A MULTIPLEPART BLOCK.MUST HAVE ATRAVELINGBLOCKTO HAVEMECHANICALADVANTAGE.THETHEORETICALADVANTAGE ISEQUAL TOTHE NUMBEROF PARTSOF LINESUPPORTINGTHE TRAVELINGBLOCK.

TRUE MECHANICAL ADVANTAGE

ADVANTAGEFOR BRONZE

BUSHING

ADVANTAGEFOR ANTIFRICTION

NUMBEROF LINEPARTSYOU NEED

• PRODUCT KNOWLEDGE• APPLICATION KNOWLEDGE• MANUFACTURER OF KNOWN CAPABILITY• PRODUCTS THAT ARE CLEARLY IDENTIFIED WITH THE FOLLOWING:

1. MANUFACTURER’S NAME AND LOGO 2. LOAD RATING OR SIZE THAT REFERENCES RATINGS 3. TRACEABILITY CODE

5.16 5.60 6

5.90 6.47 7

6.60 7.32 8

7.27 8.16 9

7.91 8.98 10

8.52 9.79 11

9.11 10.60 12

A GOOD RISK MANAGEMENTPROGRAM RECOGNIZES

• PERFORMANCE REQUIREMENTS INCLUDE THE FOLLOWING:

1. LOAD RATED PRODUCTS2. QUENCHED AND TEMPERED3. ABILITY TO DEFORM WHEN OVERLOADED.4. ABILITY TO WITHSTAND REAL WORLD LOADING IN DAY TO DAY USE, TOUGHNESS.

TOTAL LOADTHE TOTAL LOAD PLACED ON THE BLOCKAND ITS END FITTING DETERMINES THE

WORKING LOAD LIMIT REQUIRED.2801 DAWSON RD, TULSA, OK, USA

(918) 834-4611 FAX (918) 832-0940WWW.THECROSBYGROUP.COM

VERSION (8/1/03)

WORKING WITH BLOCKS 2OVERHAUL WEIGHT

To determine the weight of theblock or overhaul ball that isrequired to free fall the block,the following information isneeded: Size of wire rope,Number of line parts,Type of sheave bearing,Length of crane boom,and Drum Friction.

BLOCK REAVINGStraight laced reeving is a basic methodof placing the rope through a set ofblocks. The end of the rope is fedthrough the outside sheave of theupper block to the outside sheaveof the lower (traveling) block. Thiscontinues to the last sheave.

ADVANTAGES: 1. Allows blocks to run closer together. 2. Is simple. 3. Has no reverse bends.

DRAWBACKS:Tilting because ofimbalanced loadingcan cause blockrotation and wearof the sheaves andwire rope

SYMMETRICAL REEVING

Reeve blocks symmetrically to distribute load evenly. All sheaves must be reeved to achieve the full working load limit of the block.BLOCK CABLING1. Reduce wire rope length2. Use even part reeving3. Dead end to boom4. Evaluate wire rope construction

FOR ADDITIONAL INFORMATION REFER TO THE CROSBY GENERAL CATALOG


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RIGGING WITH BLOCKS 3

TOTAL LOAD: Load Wt. (1000 lbs.) + Winch Pull (1000 lbs.) = 2000 lbs. MINIMUM

NO MECHANICAL ADVANTAGE = ONE WINCH PULL = 1,000 LBS.

TOTAL LOAD: Load Wt. (1000 lbs.) + Winch Pull (5 00 lbs.) = 15 00 lbs. MINIMUM

MECHANICAL ADVANTAGE = TWOWINCH PULL = 5 00 LBS.

PULL (P) RQUIRED (LEVEL GROUND)= WEIGHT (W) X FRICTION FACTOR (f)

MANY SURFACES HAVE A FRICTION FACTOR < 1 (f) for STEEL ON STEEL is .16 lubricated (f) for STEEL ON STEEL is .8 clean (f) for WOOD ON METAL is .2 to .6 clean (f) for WOOD ON WOOD is .25 to .5 clean

WINCH PULL REQUIRED = WEIGHT X FRICTION FACTOR MECHANICAL ADVANTAGE

ONE PART OF LINE

REQUIRED PULL

FRICTIONFORCE

TWO PARTS OF LINE

TOTAL LOAD = 1,000 LBS.

P = (W)x(f)

WEIGHT = W

BLOCK LOADING - ANGLE FACTOR MULTIPLIERS 4A single line sheave block used tochange load line direction can be

subj ect to total loads greatlydifferent from the line pull

ANGLE FACTOR MULTIPLIERS

ANGLE FACTOR ANGLE FACTOR0˚ 2.00 100˚ 1.2910˚ 1.99 110˚ 1.1520˚ 1.97 120˚ 1.0030˚ 1.93 130˚ .8440˚ 1.87 135˚ .7645˚ 1.84 140˚ .6850˚ 1.81 150˚ .5260˚ 1.73 160˚ .3570˚ 1.64 170˚ .1780˚ 1.53 180˚ .0090˚ 1.41 — —

TOTAL LOAD = LINE PULL X ANGLE FACTOREXAMPLE, AT 45 DEGREES, AND 10,000 LB LINE PULL,

TOTAL LOAD = 10,000 X 1.84 = 18,400 LBS.

FOR ADDITIONAL INFORMATION REFER TOTHE CROSBY GENERAL CATALOG


Rigging Information

SHEAVE INSPECTION 9

SHEAVE INSPECTIONCHECKING GROOVE SIZ E FOR PROPER SIZ E

SHEAVE INSPECTIONMinimum groove radii for worn sheave

tolerances per “ Wire Rope User’ s Manual” (third edition)

SHEAVE FLEET ANGLE*• Fl e e t An g l e i s t h e e n t r a n c e a n d e x i t a n g l e o f t h e w i r e r o p e r e l a t i v e t o t h e s h e a v e• Fl e e t a n g l e s h o u l d b e n o m o r e t h e n 1- 1/ 2 d e g r e e s

NOMINAL WIREROPE SIZ E

(in.)RADII (in.)

NOMINAL WIREROPE SIZ E

(in.)RADII (in.)

1/4 .128 3/4 .384

FLEET ANGLE5 /16 .160 7 /8 .448

3/8 .192 1 .5 13

7 /16 .224 1-1/8 .5 7 7

1/2 .25 6 1-1/4 .641 * NOTE: “ Wire Rope User’ s Manual” allows 2 degrees on grooved winch drums.9/16 .266 1-3/8 .7 05

5 /8 .320 1-1/2 .7 69

FOR ADDITIONAL INFORMATION REFER TO THE CROSBY GENERAL CATALOG

Check sheave groovesfor wear

Check flangesfor wear,chips and cracks

Check groovesfor proper size

Check bearingsfor wobble, lubrication& ease of rotation

IMPROPER PROPER

BLOCK HOOK INSPECTION 10CROSBY RECOMMENDS AS A MINIMUM:

1. A v i s u a l i n s p e c t i o n f o r c r a c k s , n i c k s , w e a r , g o u g e s a n d d e f o r m a t i o n a s p a r t o f a c o m p r e h e n s i v e d o c u m e n t e d i n s p e c t i o n p r o g r a m , s h o u l d b e c o n d u c t e d b y t r a i n e d p e r s o n n e l i n c o m p l i a n c e w i t h t h e s c h e d u l e i B30.10.

2. Fo r h o o k s u s e d i n f r e q u e n t l o a d c y c l e s o r p u l s a t i n g l o a d , o r e x p o s e d t o c o r r o s i v e c o n d i t i o n s ( Ro a d Sa l t , e t c .) t h e h o o k a n d t h r e a d s h o u l d b e p e r i o d i c a l l y i n s p e c t e d b y Ma g n e t i c Pa r t i c l e o r Dy e Pe n e t r a n t .

LUBRICATION OF HOOK BEARINGS:

Anti Friction — Ev e r y 14 d a y s f o r f r e q u e n t s w i v e l i n g ; e v e r y45 d a y s f o r i n f r e q u e n t s w i v e l i n g .

Bronz e Thrust Bushing or No Bearing — Ev e r y 16 h o u r sf o r f r e q u e n t s w i v e l i n g ; e v e r y 21 d a y s f o r i n f r e q u e n t s w i v e l i n g

ASME B30.10 INSPECTION FREQUENCY1. Frequent Inspection - vi su a l e xa m i n a t i o n s b y t h e o p e r a t o r o r o t h e r d e si g n a t e d p e r so n .

( a ) n o r m a l se r vi ce - m o n t h l y .( b ) h e a vy se r vi ce - w e e kl y t o m o n t h l y( c) se ve r e se r vi ce - d a i l y o r w e e kl y(d) special or infrequent service as authorized by a qualified p e r so n - b e f o r e a n d a f t e r e a ch o ccu r r e n ce , w i t h r e co r d s o f t h e o p e r a t i o n .

2. Period Inspection - vi su a l i n sp e ct i o n s b y a n a p p o i n t e d p e r so n m a ki n g r e co r d s o f a p p a r e n t e xt e r n a l co n d i t i o n s t o p r o vi d e t h e b a si s f o r co n t i n u i n g e va l u a t i o n .

(a) normal service - equipment in place - yearly; (definition: se r vi ce , n o r m a l - se r vi ce t h a t i n vo l ve s o p e r a t i n g a t l e ss t h a n 85 p e r ce n t o f r a t e d l o a d e xce p t f o r i so l a t e d i n st a n ce s. )( b ) h e a vy se r vi ce - a s i n n o r m a l se r vi ce , u n l e ss e xt e r n a l co n d i t i o n s i n d i ca t e t h a t d i sa sse m b l y sh o u l d b e d o n e t o permit detailed inspection - yearly; (definition: service, heavy se r vi ce t h a t i n vo l ve s o p e r a t i n g 85 p e r ce n t t o 100 p e r ce n t o f rated as a regular specified procedure.)( c) se ve r e se r vi ce - a s i n h e a vy se r vi ce , e xce p t t h a t t h e d e t a i l e d i n sp e ct i o n m a y sh o w t h e n e e d f o r u se o f n o n d e st r u ct i ve t yp e of testing - quarterly; (definition: service, severe - heavy service co u p l e d w i t h a b n o r m a l o p e r a t i n g co n d i t i o n s. )

FOR ADDITIONAL INFORMATION REFER TO ASME B30.10 AND OSHA 1910.17 9 OVERHEAD GANTRY CRANES

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