# Shared Flashcard Set

Year 3
Mobile crane
92
Engineering
Intermediate
11/22/2015

## Additional Engineering Flashcards

Term
 How much stronger is IWRC than Fiber core?
Definition
 7.5% stronger.
Term
 Most common grade of wire rope?
Definition
 110/120 Improved Plow
Term
 What is the difference between Lang and Regular Lay?
Definition
 Lang Lay - strands go the same way as the wireRegular Lay - strands opposite of wire
Term
 How does rotational resistant rope work?
Definition
 inner core has opposite direction lay as outer.
Term
 Most common classification of wire rope?
Definition
 6 x 19, 6 x 27
Term
 Safety Factors for: Personnel Basket, Rigging, hoist lines, chains, rotational resistant, pendant lines standing, pendant lines horizontal
Definition
 Personnel Basket - 10:1Rigging - 5:1Running lines - 3.5:1Chains - 4:1Rotational Resistant - 5:1Pendant lines standing - 3:1Pendant lines horizontal - 2.5:1
Term
 How many clips are required for seizing?
Definition
 D x 3 + 1 (round up)
Term
 How much spacing is required for wire rope clips?
Definition
 D x 6
Term
 How much wear can shackles have before replacement is necessary?
Definition
 10%.
Term
 How much distortion can hooks have before replacement is required?
Definition
 zero, there is no tolerance.
Term
 Replacement Criteria for running ropes?
Definition
 6 or more broken wires in one lay length,3 or more broken wires in one strand in one lay length.
Term
 Replacement Criteria for standing ropes?
Definition
 more than 1 broken wire going into an end fitting,3 or more broken wires in one lay length
Term
 Replacement criteria for rotation resistant rope?
Definition
 2 broken wires in 6 rope diameters or 4 broken wires in 30 diameters.
Term
 What is the efficiency of a wedge socket?
Definition
 70%.
Term
 What is the number one cause of crane accidents?
Definition
 improper set up
Term
 How much wire rope contact must rest on softeners?
Definition
 7 times the rope diameter
Term
 How much stronger is IWRC than Fiber core?
Definition
 7.5% stronger.
Term
 At what loss must a wire rope be replaced?
Definition
 1/3 wear or 7% or more of nominal rope diameter.
Term
 What can lack of lubrication can cause?
Definition
 corrosion
Term
 What must be used to lubricate wire rope?
Definition
 Light mineral oil
Term
 What causes crushed strands?
Definition
 too many layers or cross winding
Term
 What causes bird caging?
Definition
Term
 What is the 1/2/3 seizing rule?
Definition
 Length = 1-1 /12 x rope dia. Spacing = 2 rope dia. # of seizings = 3 rope dia. to next whole number
Term
 What must the reel do when re spooling drum?
Definition
 must rotate freely.
Term
 IWRC breaking strength?Fibre breaking strength?
Definition
 D^2 x 45D^2 x 42
Term
 what is the nylon stretch factor?
Definition
 10%
Term
 How efficient are shackles at A. 0*, B. 45*, C. 90*
Definition
 A. 100%B. 70%C. 50%
Term
 Re commended safe lifting angle?
Definition
 60*
Term
 Slings must not exceed what angle on a hook?
Definition
 45*
Term
 What are spreader/equalizer bars tested to?
Definition
 125%
Term
 The rope in a sheave must be supported by what amount?
Definition
 120* - 150*
Term
 Sheaves must be at least how big?
Definition
 20 times the rope diameter
Term
 Snatch blocks are not to be used for hoisting. T/F?
Definition
 True. Snatch blocks are only used to change the direction of the rope.
Term
 What are the max. Fleet angles on A. Grooved drums, B. Smooth Drums.
Definition
 A. Grooved - 2* B. Smooth - 1.5 *
Term
 How big should the flange be for A. Grooved drums, B. Smooth Drums
Definition
 A. Grooved - 2' or 2 times rope dia. B. Smooth - 2.5' or 2.5 times rope dia.
Term
 At what % wear must chains be replaced? % Stretch?
Definition
 15%. wear, 5% stretch.
Term
 Rule of thumb for chains?
Definition
 D^2 x 6
Term
 What are come-alongside tested to?
Definition
 150%
Term
 How do wire classifications work?
Definition
 number of strands x number of wires in strand
Term
 If the rope is more flexible but less resistant to abrasion, it has more or less wires per strand?
Definition
 More.
Term
 What is meant by preforming?
Definition
 wires are 'pre-bent' by the manufacturer
Term
 What does core slippage cause?
Definition
 more of the load to rest on a particular layer
Term
 How do you measure wire rope?
Definition
 from Crown to Crown.
Term
 When installing rope from reel to drum you can go from Top to Bottom. T/F
Definition
 False. Must go top to top or bottom to bottom.
Term
 Regent ion criteria for non-rotation rope?
Definition
 2 wires in 6 diameters or 4 wires in 30 rope diameters.
Term
 How do you determine lay length?
Definition
 the length it takes a strand to do one full rotation.
Term
 Unknown core rope breaking strength?
Definition
 D^2 x 8
Term
 At what percent wear must shackles be removed from service?
Definition
 10%
Term
 The maximum pull of the hoist occurs on what layer?
Definition
 the first layer
Term
 How many wraps must be left on the drum at all times?
Definition
 minimum of 5 wraps or manufacturers specification.
Term
 What are the 4 levels of field factors?
Definition
 svc x 2 - 90*Svc x 1.7 - 89* - 60*Svc x 1.4 - 59* - 45*Svc x 1 - 44* - 30*
Term
 Aluminium is aloud for sheaves. T/F?
Definition
 false. Sheaves must not be made of aluminum.
Term
 What material must hooks be made of?
Definition
 Forged Steel
Term
 Chain sounds must be what alloy?
Definition
 8 or 80 / 10 or 100
Term
 115/125 grade is how much stronger than 110/120?120/130 grade is how much stronger than 115/125
Definition
 15%10%
Term
 How many wires in a 6 x 19 wire rope?
Definition
 16 - 26
Term
 Describe 6x9 wire rope.
Definition
 Has large wires, not very flexible but very abrasion resistant. Used as guy lines, ski tows and tramways.
Term
 Describe 6x19 rope
Definition
 has the most diverse use. Good combination of flexibility and abrasion resistance. Usually seals regular lay.
Term
 Describe 6x37 wire rope
Definition
 31 to 49 wires per strand. Most flexible but prone to crushing on multi-layered drums. Used for high speed cranes, draglines or and power shovels.
Term
 Describe 8x19 wire rope
Definition
 more flexible than 6 strand but crushes and distorts easy. Usually on high speed hoists and tower cranes.
Term
 When hoisting a bundle of pipe, which hitch is best for max. contact between sling and load?
Definition
 2 leg double wrap chokers.
Term
 Which way should the shackle be placed in the hook
Definition
 pin resting on hook
Term
 When non-rotating rope is being used with a wedge socket, there is a high possibility of...
Definition
 core slippage
Term
 Which core is better for high temperature operations?
Definition
 IWRC
Term
 What is the only type of natural Fiber rope used in construction?
Definition
 number one grade manilla
Term
 What is the breaking strength of 1' diameter grade one manilla?
Definition
 9000lbs
Term
 4 other types of natural Fiber rope other than manilla
Definition
 Hemp - Strongest of the natural fibersSisal - 75% of hempCoir - made from coconut husk (1/4 strength of hemp)Cotton - 60% as strong as hemo
Term
 What is the strongest synthetic rope?
Definition
 nylon, other than Kevlar type.
Term
 What are some characteristics of Polyester
Definition
 2 times stronger than manilla, not as strong as nylon but has less stretch. Recommended when minimum stretch, High strength and durability needed.
Term
 What is the lightest, most economical and whiskey used synthetic rope?
Definition
 polypropolyene
Term
 How strong is polyethylene compared to nylon?
Definition
 50%
Term
 What must chain slings have on their ID tag?
Definition
 A. Name or trademark of manufacturerB. GradeC. Nominal chain sizeD. Number or legsE. Rated load for at least one hitch type and the angle it's based onF. LengthGo individual sling identification (ex. serial numbers)
Term
 At what percent stretch must chains be taken out of service?
Definition
 5%
Term
 What must be present on repaired chains?
Definition
 the repairing companies identity
Term
 What are the two types of cable clips?
Definition
 U-bolt and Fist grip
Term
 How efficient are cable clips?
Definition
 80%, as low as 40 if installed incorrectly
Term
 You must never connect two straight wire rope lengths with cable clips. T/F
Definition
 true, if necessary two eyes must be created and connected.
Term
 ____ are permanent distortions on a wire rope and cannot be repaired?
Definition
 Kinks
Term
 Synthetic Fiber rope sling tags must contain what?
Definition
 manufacturer name and date or trademarkCode or stricken numberSafe working load for the types of hitches permittedThe type and material of construction
Term
 Breaking strength for galvanized wire rope
Definition
 D^2 x 40
Term
 Knots reduce rope strength by how much
Definition
 50%
Term
 How long should wedge socket tail lengths be?
Definition
 6-8 rope diameter, min of 6''20 rope diameters but no less than 6" for non-rotational
Term
 Only shouldered eye bolts can be used for lifting. T/F
Definition
 true, shoulder-less must never be used for hoisting
Term
Definition
 advantage - resistant to abrasionDisadvantage - can unravel easier
Term
 Type 1 sling
Definition
 triangle end fittings that have a slot for choking
Term
 Type 2 sling
Definition
 triangle fitting on both ends with no slot for showing. Straight pull or basket only.
Term
 Type 3 sling
Definition
 flat eyes formed on either side.
Term
 Type 4 sling
Definition
 eyes on either side, angled rather than flat. Know as twisted eye sling
Term
 Type 5 sling
Definition
 endless sling. Sometimes known as a grommet
Term
 Type 6 sling
Definition
 return/reversed eye sling. multiple widths of webbing held edge to edge.
Term
 If a wire rope is not used win thin a month it should be inspected before next use. T/F
Definition
 True
Term
 What is the 5/10 rule
Definition
 10 broken wires in one rope lay or 5 broken wires in one strand in one lay
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