Attachment Methods - Pfeifer GK 8 Manual Del Usuario

Attach only when you have made certain that the chains
are not slipping, as shown in the example:
Fig. 3.6.1: correct
Coupling turnbuckle
When using a coupling turnbuckle for adjusting the
chain leg length in a chain sling the use of a securing
chain is mandatory, so that the coupling clamp lock
cannot become unscrewed. When doing this, ensure
that the installation is done correctly. This is not
necessary if the coupling turnbuckle has an automatic
stop collar. The coupling turnbuckle must be approved
for use in chain slings.
Impacts
Loading must occur in a manner that is free from
impact. When there is a risk of severe impacts, e.g.
caused by the load falling into the unloaded chain sling,
using the chain sling is not permitted. When there is a
risk of medium impacts, e.g. caused by the slipping of
the chain sling during its adjustment to the shape of the
load, the carrying capacity should be reduced by at
least 30 % . Any dynamic force should be avoided.
The chain legs must be aligned twist-free and straight
(not knotted). Suspension rings and hooks or other
accessories as connecting elements to the load or to
the crane hook must also move freely and be able to
align themselves in the load direction.

3.7 Attachment methods

Chain slings can be attached to the load in several
ways:
Direct attachment method
In direct attachment, attachment parts are connected
directly to the attachment points on the load. It is
important that hooks and attachment points fit together
so that the load application point is in the hook base and
is excluded at the hook tip. The safety latch or flap must
be closed.
In the case of multi-leg chain slings the hook tip should
point outward, unless the hooks are specially designed
Chain slings 11/2019 / Subject to change!
6
Fig. 3.6.2: wrong
for a different use. The orientation of the hook tip can be
changed by turning the suspension ring – underside up.
Laced attachment method (Choker hitch)
In this case the chain legs of the chain sling are guided
through or under a load and the attachment part is
suspended or reeved on the chain (see Fig. 3.7.1).
This attachment method can be used when no suitable
attachment points are available and offers the additional
advantage that the chain sling bundles the load.
When using the choker hitch the carrying capacity
(WLL) of the chain sling is limited to 80 % of the tagged
carrying capacity.
Fig. 3.7.1: Laced attachment method
Looping attachment method
In the case of the basket hitch a chain leg is guided
through or under a load and the attachment parts are
suspended directly in the suspension link or in the load
hook of the crane or hoist. In general this attachment
method is used in pairs with two chain slings;
however it is not suitable for lifting loose bundles,
because parts of the load can shoot out in the
direction of travel during braking. If the outer shape of
the load permits, a single-leg chain sling can also be
used, provided the chain sling is guided through the
load, namely above its centre of gravity, so that it
cannot tip.
Double looped attachment method
This method offers greater safety for loose bundles
by means of additional looping of the load. The
determination of the carrying capacity of suspension
gears requires particular attention for the looped and
double looped attachment methods. For example,
the carrying capacity of a single-leg suspension gear
remains unchanged when the hook is hooked into
the suspension ring following looping. If, in the case
of a single-leg ring chain, the ring is hooked into the
crane hook after the looping , the carrying capacity
of a two-leg suspension gear is assumed (see Fig. 3.7.2
to 3.7.5).