Identification
of
wire rope in classifications facilitates selection on the basis
of
strength and weight/foot since
it
is customary practice that all similar ropes with-
in a classification have the same minimum breaking force and approximate
weight/foot.
Only three wire ropes under the 6 x
19
classification actually have
19
wires: 6
x 19 two-operation (2-op), 6 x 19
Seale (S), and 6 x
19
Warrington (W). All the
rest have different wire counts.
In
the 6 x 36 (previously 6x37 and changed to
conform with international standards) classification, there is a greater variety
of
wire constructions. The commonly available constructions in the 6 x 36 classifi-
cation include:
6 x
31
Warrington Seale (WS), 6 x 36
WS,
6 x
41
Seale Filler
Wire
(SFW), 6 x
41
WS,
6 x 43 Filler Wire Seale (FWS), 6 x 49 Seale
Warrington Seale (SWS), etc. For the users' convenience, Table 1 lists the most
widely used rope classifications.
While the interior
of
a strand is
of
some significance, its important characteris-
tics relate to the number and size
of
the outer wires. This is discussed in detail in
the section titled
FACTORS AFFECTING
THE
SELECTION
OF
WIRE
ROPE
(p. 59).
Wire rope nomenclature also defines the following:
Rope Description
• length
• size (nominal diameter)
• Preformed
or
non-preformed
• direction and type
of
lay
• finish
of
wires
• grade
of
rope
• type
of
core
If
direction and type
of
lay are omitted from the rope description, it is pre-
sumed to be right regular lay. Two other assumptions are made by the supplier:
1)
if
finish
of
wire is omitted, this will be presumed to mean uncoated "bright"
finish, and 2)
if
no mention is made with reference to preforming, preforming
will be presumed. (Note that an order for elevator rope must have an explicit
statement since both preformed and non-preformed ropes are used extensively.)
As an example, a complete description would appear thus:
600
ft
3/4" 6 x 25
FW
preformed RRL
Extra Improved
Plow Steel IWRC
When a center wire is replaced by a strand, it is considered as a single wire,
and the rope classification remains unchanged.
The wire rope cross sections illustrated in Figures 7 and 8 represent some
of
the most commonly used configurations, and are arranged under their respective
classifications.
Since these are in greater demand, they are more generally available.
Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
-13
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