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Selecting proper
type of rope is more complicated than expected.
It is very important to choose the right rope
for its application because it plays a crucial
role for the life of the rope. The life of the
rope can be doubled depending on the selection.
In order to choose the most proper type of rope,
the characteristics of the rope and other equipment
in accordance with the working environment must
be considered first. They are breaking load (safety
working load), flexibility, corrosiveness, anti-abrasion,
elongation (the modulus of elasticity), rotation,
form, and working temperature. These characteristics
are often mutually contradictory and no rope can
comply with all the conditions. Therefore, it
is the very tip to consider the most important
factor among all of the working condition in choosing
the most proper rope. |
|
| |
| 1.
Rope selection points |
Required
characteristics |
Tips to consider |
Typical application |
| Flexibility |
- Ropes with fiber core of the rope are more
flexible
- Ropes with fiber core of each strands are
more flexible
- Point contacting wire type rope is more
flexible than plane contacting type rope.
- The more the number of wires make the rope
more flexible.
|
Sling
Lashing |
- Plane contacting wire type rope is more
appropriate than point contacting wire type
rope.
- The more numbers of wires make the rope
more flexible.
- The more numbers of strands make the rope
more flexible except for multi-layers ropes.
- When there are too many wires, a wire can
be easily worn out.
- The more the number of strands, the more
rotating characteristics, except for multi-layers
ropes.
|
Crane |
| Breaking load |
- Plane contacting wire type rope has better
breaking load than point contacting wire type
rope.
- The higher tensile strength of wires, the
higher breaking strength.
- Independent wire rope core has better breaking
load than fiber core.
- Plane contacting lay rope has better breaking
load than point contacting rope.
|
|
| Elongation |
- The fewer the number of wires, the less
elongation
- Point contacting wire type rope maintains
less elongation than plane contacting wire
type rope.
- Fiber core shows more elongation, then IWRC
and IWSC in order.
|
Pendent
Bridge hanger
Cable Way & Elevator |
| Anti-abrasion |
- The smaller number of wires, the better
anti-abrasion
- Flattened type, swaged, and parallel wires
ropes with flat surface are better in terms
of anti-abrasion.
- Parallel wires are better than non-parallel
wires in terms of anti-abrasion
|
Cable Way & Logging
Roperail
Mining |
| Maintaining
good form |
- Parallel wires are better than non-parallel
wires in terms of form
- IWRC is better than fiber core in terms
of form
- The smaller number of wires and strands
is better in terms of form
- Parallel wires and flattened type of ropes
are better in terms of form
|
|
| Rotation |
- Non-rotating ropes to be required.
- The longer the rope rolled, the more rotation
- Using Z twist rope together with S twist
rope helps to prevent rotation
- Plain lay has less rotation than Langs'lay
- The smaller radius of sheave groove, the
more rotation
- The smaller number of strands, the less
rotation except for plural layers rope
|
High lifting crane
Messengers span wires |
| Anti-corrosion |
- Galvanized ropes are required in working
environment where risk of corrosion exists
- Ropes with smaller number of wires (thicker
wires) are better in terms of corrosion
- Rope grease has good aspect in terms of
corrosion
- Fiber core is better than wire core in terms
of corrosion
- Even though the working condition is agreeable,
corrosion must be considered for a long time
use
|
Fishing
Pendent
Hanger
Anchor |
| Temperature |
- Wire core is required because fiber core
is weak at high temperature
- Black grease is required for environment
of high temperature, and if necessary, special
grease for high temperature must be used
- Red grease is appropriate for environment
of lower temperature
|
Ladle crane |
|
| |
| 2.
Wire ropes of various kinds |
| Classification |
Wireropes |
| Industry |
Equipment |
Application |
Condition |
Rotating |
Core |
Construction |
| CRANE |
GENERAL CRANE |
HOIST |
Normal lifiting |
|
IWRC |
6XWS(36), 6XFI(25), 6XFI(29) |
| FC |
6XWS(26), 6XWS(36), 6XFI(25), 6XFI(29) |
| High lifiting |
Non-Rotating |
|
F4XSeS(39), 19X7, 35X7 |
| TROLLEY |
|
|
IWRC |
6XWS(36) |
| FC |
6XWS(36), 6XFI(29) |
| HOLDING |
|
|
IWRC |
6XWS(36), 6XFI(25), 6XFI(29) |
LUFFING
(JIB) |
|
|
IWRC |
6XWS(36), 6XFI(25), 6XFI(l29) |
BOOM
HOIST |
|
|
IWRC |
6XWS(26), 6XWS(36), 6XFI(25), 6XFI(29) |
| PENDENT |
|
|
IWRC |
6XWS(26), 6XFI(25), 6XS(19), 7XS(19) |
TOWER
CRANE |
HOIST |
High lifiting |
Non-Rotating |
|
FXSeS(39), 19X7, 35X7 |
| TROLLEY |
|
|
FC |
6XWS(36) |
| STAY |
|
|
IWRC |
6XS(19), 6XFI(25), 7XS(19) |
JIB TOWER
CRANE |
HOIST |
High lifiting |
Non-Rotating |
|
F4XSeS(39), 19X7, 35X7 |
JIB
HOLDING/
LUFFING |
|
|
IWRC |
6XWS(36) |
| FC |
6XWS(36), 6XFI(29) |
CONTAINER
GANTRY
CRANE |
HOIST |
|
|
IWRC |
6XWS(36) |
| TROLLEY |
|
|
FC/
IWRC |
6XWS(36) |
| BOOM HOIST |
|
|
IWRC |
6XWS(36), 6XFI(25), 6XFI(29) |
UNLOADER
CRANE
(GRANTRY
GRAB CRANE) |
HOIST/
HOLDING/CLOSING |
|
|
IWRC/
FC |
6XWS(36) |
| TROLLEY |
|
|
IWRC/
FC |
6XWS(36), 6XFI(29) |
DERRICK
CRANE |
HOIST |
Normal lifiting |
|
IWRC |
6XWS(36), 6XFI(25), 6XFI(29) |
| High lifiting |
Non-Rotating |
|
F4XSeS(39) |
BOOM
HOIST |
|
|
IWRC |
6XWS(36), 6XFI(25), 6XFI(29) |
FLOATING
CRANE |
HOIST
LUFFING |
|
|
IWRC |
6XWS(36), 6XFI(29) |
| STAY |
|
|
IWRC |
6XWS(36), 6XFI(29) |
PORTAL JIB
CRANE |
HOIST |
Normal lifitingf |
|
IWRC
/FC |
6XWS(36) |
| High lifiting |
Non-Rotating |
|
F4XSeS(39) |
BOOM
HOIST |
|
|
IWRC |
6XWS(36) |
MOBILE
(TRUCK)
CRANE |
MAIN
HOIST |
|
|
IWRC |
6XWS(36), 6XFI(25), 6XFI(29) |
| Non-Rotating |
|
F4XSeS(39), 19X7 |
AUXILIARY
HOST |
High lifiting |
Non-Rotating |
|
F4XSeS(39), 19X7 |
CRAWLER
CRANE |
HOIST |
MULTI
FALL |
|
IWRC |
6XWS(36)(plane winch -> Powerflex rope) |
SINGLE
FALL |
Non-Rotating |
|
F4XSeS(39), 19X7 |
BOOM
HOIST |
|
|
IWRC |
6XWS(36) |
| PENDENT |
|
|
IWRC |
6XFI(25), 6XS(19) |
OVERHEAD
CRANE |
HOIST |
|
|
IWRC
/FC |
6XFI(25), 6XF(29), 6XWS(36) |
LADLE
CRANE |
MAIN/
AUXILIARY
HOIST |
|
|
IWRC |
6XWS(36) |
| MARINE |
FITTINGS |
MOORING |
|
|
FC |
6X24, 6X37 |
| BOAT FALL |
|
Non-Rotaing |
|
F4XSeS(39), 19X7 |
| TOW BOAT |
TOW LINE |
|
|
IWRC/FC |
6X24, 6X37, 6XWS(26), 6XWS(31), 6XWS(36), 6XFI(25) |
| CARGO RUNNER |
CARGO FALL |
High lifiting |
Non-Rotaing |
FC |
F4SeS(39), 4XWS(36), 4XFI(29) |
| Normal lifiting |
|
IWRC/FC |
6XWS(36), 6XFI(29), 6X24 |
| TOPPING LIFT |
|
|
FC |
6X24, 6XWS(36), 6XFI(29) |
| FISHING |
|
TRAWL |
|
|
FC |
6XWS(26), 6XWS(31) |
| NET |
|
|
FC |
6X24 |
| PURSE |
|
|
IWRC/FC |
6XS(19), 6XWS(26) |
| GENERAL |
|
SLING |
|
|
FC |
6X24, 6X37, 7X7X7, 7X7XS19 |
| LASHING |
|
|
FC |
6X12, 6X15, 6X18 |
| SPRING LAY |
|
|
IWRC
/FC |
6X19, 6X24, 6X37 |
| OIL FIELD |
|
SAND LINE |
|
|
FC |
6X7 |
| TUBING LINE |
|
|
IWRC |
6XWS(26), 6XWS(31) |
CRLLING
LINE |
|
|
IWRC |
6XS(19), 6XFI(21) |
| CABLE WAY |
CABLE CAR |
TRACTION LINE |
|
|
IWRC |
6XFI(25), 6XWS(26) |
| CARGO |
MAIN |
|
|
|
6X7(Plane contact lay) |
| TRACTION LINE |
|
|
FC |
6X7, 6XS(19), 6XFI(21), 6XFI(25) |
| SUSPENSION LINE |
|
|
|
6X37, 6XSeWS(53) |
| SKI LIFT |
|
|
|
FC |
6X7, 6XS(19), 6XWS(26), 6XWS(31) |
| MINING |
INCLINED SHAFT |
HOIST ROPE |
|
|
FC |
6X7 |
| SHAFT(KOPE) |
HEAD ROPE |
|
|
FC |
6XWS(31), 6XWS(31), 6X7(Lang's lay) |
| TAIL ROPE |
|
|
FC |
6XSeS(61) |
| SHAFT(DRUM) |
HOIST |
|
|
FC |
6X7, 6XFI(17), 6XFI(21), 6XFI(25) |
| EXCAVATOR |
HOIST |
|
|
FC |
6X7(SZ), F4XSeS(39) |
| EXCAVATOR
DRILLING |
TOWER
EXCAVATOR |
MAIN |
|
|
IWRC |
7XS(19), 6XS(19) |
| TRACTION LINE |
|
|
|
6XS(19), 6XFI(21) |
| SUSPENSION LINE |
|
|
FC |
6XFI(25) |
CLAMSHELL
CRANE |
BOOM HOIST/
HOLDING/
CLOSING |
|
|
IWRC |
6XWS(36) |
| EXCAVATOR |
GRAB HOIST/
BOOM HOIST |
below 26mm |
|
IWRC |
6XFI(25) |
| excess 26mm |
|
IWRC |
6XWS(36) |
| PILE, DRIVER |
MAIN |
|
|
IWRC |
6XFI(25), 6XFI(29) |
| GRAB SHIP |
BOOM HOIST |
|
|
IWRC |
6XFI(25), 6XWS(31) |
| GRAB HOIST |
|
|
IWRC |
6XFI(29), 6XWS(36) |
| CLOSING |
|
|
IWRC |
6XWS(36) |
| PUMP SHIP |
LADDER
HOIST |
|
|
IWRC
/FC |
6XWS(36), 6XFI(29) |
LADDER
SWING |
|
|
IWRC
/FC |
6XWS(36), 6XFI(29) |
| ELEVATOR |
|
HOIST/
GOVERNOR |
|
|
FC |
8xS(19) |
COMPENSA
-TING |
|
|
FC |
6X37, 8XS(19) |
| BRIGE |
SUSPENSION BRIGE |
MAIN |
|
|
|
1X37, 1X61, 7X19, 7X37 |
| HANGER |
|
|
|
7X7, 7X19, 7X37 |
| MARINE |
ANCHOR |
ANCHOR |
|
|
IWRC |
6XWS(36), 6XWS(41), 6XSeWS(53) |
| FORESTRY |
LOGGING |
MAIN/
SKY LINE |
|
|
IWRC |
6XWS(26)(swaging), 6XS(19),
6XWS(26), 6XFI(25) |
| ETC. |
POWER TRANSMISSION LINE |
TRACTION ROPE |
|
|
|
F4XSeS(39), 3XSeS(39) |
| FLOODGATE |
HOIST |
|
|
IWRC
FC |
6X37, 6XWS(36) |
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