FLATTENED (TRIANGULAR) STRAND WIRE ROPE f.
Each strand
of
a flattened strand wire rope
is
comprised
of
a layer or layers
of
wire around a triangular shaped center. The center consists
of
either a triangular
shaped wire element, or wires in a triangular configuration. The triangular strand
shape provides a high strength rope with high metallic area which is resistant to
crushing. Abrasion resistance is enhanced by an increased bearing surface, in
comparison to round strand ropes. Various flattened strand constructions are
illustrated
in
Figure 14. Minimum breaking forces for flattened strand ropes are
found in Tables 29 and
30.
6x31
Style V
Flattened Strand
(Brangle Center)
FC
6 x25 Style B
Flattened
Strand
(Solid
Center Wire)
FC
Figure 14. Flattened
Strand Wire Rope Cross Sections.
PLASTIC COATED WIRE ROPE
6x27
Style H
Flattened Strand
(3
Wire Center)
FC
6x
30
StyleG
Flattened Strand
(Plaited
Center)
FC
Various wire rope constructions are available with a plastic coating applied to
the exterior
of
the rope. Small diameter galvanized and stainless steel wire ropes
with plastic coating are common. The plastic coating can provide protection
against corrosion and in some cases reduce wear
of
the rope and other rigging
components. Plastic coated ropes can be difficult to inspect. Minimum breaking
forces for plastic coated ropes are based on the diameter and grade
of
the rope
prior to coating.
Plastic coated wire ropes are typically not used as operating ropes, but mostly
as standing or stationary ropes. There are exceptions such
as
can conveyor ropes,
some aircraft cables and other small diameter ropes.
PLASTIC FILLED WIRE ROPE
Plastic filled wire ropes are wire ropes in which internal spaces are filled with
a
matrix
of
plastic. The plastic extends to, or slightly beyond, the outer circum-
ference
of
the rope. Plastic filling may improve bending fatigue life by reducing
internal and external wear. Minimum breaking forces for plastic filled ropes are
based on the diameter and grade
of
the rope prior to plastic filling.
Plastic filled wire ropes are used in many demanding applications and require
special handling and inspection techniques. Consult the rope manufacturer for
specific instmctions and recommendations. The Inspection section
of
this manu-
al provides detail on inspection
of
plastic filled ropes.
22 • Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
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