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38 Cards in this Set
- Front
- Back
- 3rd side (hint)
shackles
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do not turn/flush
slightly beyond the end |
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WLL
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working load limit
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shock loading
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jumps up and drops
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CRITICAL HOIST
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greater than 85%
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SLING STRESS
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L-LENGTH OF SLING
HEIGHT WEIGHT NUMBER OF LEGS |
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Wire rope
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TENSILE STRENGTH
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46000 psi
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minimum grade
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8
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grade 8 and 10 marks
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8 or higher marked 8,80,800
10 used for personnel...marked 10 or 100 marks should be raised not indented |
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annealing
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do not anneal alloy chains!
it is subjected to a process of heating and slow cooling in order to toughen and reduce brittleness. |
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grab hook
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specifically designed to hook onto chain links
used to shorten chain |
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softeners
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any material placed between the sling and the load to prevent damage.
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alloy chain safe practices
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always she proper type of alloy chain
do not repair alloy chain w manufactured links as they arebnotbas strong as the original links. if repairs need to be made, send them back to manufacturer. do no weld on alloy chain. it can reduce strength up to 50%. do not anneal. can also reduce strength up to 50%. |
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chain inspection
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wear
bends and twists stretching heat damage welds *never de-rate or lower WLL based on condition. always inspect EVERY link. a chain is only as strong as its weakest link. |
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master link
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large forged steel ring placed on a hoisting hook to which rigging equipment can be attached.
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leg
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one sling in a set of slings
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binding
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restrained or restricted movement in a chain link due to excessive stretching.
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cuts, nick, gouges
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these should be ground smooth. I not they will create stress points in the links and cracks may develop.
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heat damage
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chains heated to 700 lose 20%
chains heated to 800 lose 30% chains heated to 900 lose 40% chains heated to 1000 lose 50% ALL CHAINS REMOVED IF HEAT REACHES 1000 |
minus 5
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slings...five most common
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wire rope
synthetic web twin path chain sling metal mesh |
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safety factor for slings
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5 to 1
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do math =.5
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RATIOS INVOLVING SLINGS
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D/d=ratio
D-diameter of the object it is bent around d-diameter of the wire rope wire rope 20 to 1 shackles 2 to 1 |
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circumference of grommet
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1"=96"
96 X diameter of wire/rope |
3/4"=72"diameter
1"=96"diameter 1/2"=48"diameter |
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FC
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fiber core
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IWRC
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independent wire rope core
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cable laid sling
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standard design consisting of six individual wire ropes laid around a 7th wire rope.
very flexible minimum D/d ratio is 10 |
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synthetic sling
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light soft and flexible
not longer than 6' leather all labels on sling date was made not expired |
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twin path slings
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measure and see if shrunk
should be at least half inch put a light trough fiber should transmit to other end. if not do not use! |
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twin path sling advantages
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lightweight
flexible no lube needed won't rust easy to transport and store |
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chain slings
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2 basic types w many variations
basket type hook type A-alloy T-transport NOT FOR RIGGING grade 8 steel very tough specific markings |
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chain sling marking specifications
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manufacturer
size of chain grade of chain maximum rated capacity length may include... number of leg's serial number trademark |
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metal mesh sling
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*CARBON OR MESH
heavy, medium, or light duty carbon steel ornstainless |
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metal mesh sling types
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type 302-general purpose stainless steel w good strength property and resistant to many corrosive
type 304-low carbon variation of 302 |
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heavy duty metal mesh sling
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35-CS heavy duty carbon steel sling
35-SS heavy duty stainless steel |
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medium duty metal mesh slings
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43-CS MEDIUM DUTY CARBON STEEL SLING
43-SS MEDIUM DUTY STAINLESS STEEL SLING |
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light duty metal mesh sling
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has 59 spirals
59-CS LIGHT DUTY CARBON STEEL SLING 59-SS LIGHT DUTY STAINLESS STEEL SLING |
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sling inpection
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all riggers should be able to do inspection at least annually.
keep records ID TAGS must have all manufacturing info synthetic has red yarn, when visible sling should be removed from service distortion of slotted by 10% increasing service life |
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increasing service life
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synthetic fiber slings kept clean, dry, oil free.
avoid excessive exposure to direct sunlight when drying synthetic slings. do not use lube avoid contact w all acids "when u see red, ur dead." cushion abjects, avoid sharp edges. |
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