Figure 13-39.Determination of single-choker hitch sling
Double-choker hitch (fig. 13-40): For sling angle
of 45 degrees or more, SWL = SWL (of
single-vertical hitch) x 3 divided by 4 x H divided
by L x 2.
Sling angles of less than 45 degrees, SWL = SWL
(of single-vertical hitch) x A divided by B x H
divided by L x 2.
All slings must be visually inspected for obvious
unsafe conditions before each use. A determination to
remove slings from service requires experience and
good judgment, especially when evaluating the
remaining strength in a sling after allowing for normal
wear. The safety of the sling depends primarily upon the
remaining strength. Wire rope slings must be
immediately removed from service if any of the
following conditions are present:
l Six randomly distributed broken wires in one
rope lay or three broken wires in one strand in one lay
Figure 13-40.Determination of double-choker hitch sling capacity.