Limits Of Use For Special Attachment Methods - Pfeifer HIT GK 8 Traducción Del Manual Original

5.1 Limits of use for special
attachment methods
There are attachment methods that are widely used, but
require the working load limit to be reduced:
Laced attachment method (Choker hitch)
In this case, a chain leg of the chain sling is guided
through or under a load and the attachment part (e. g.
hook or ring) is fastened to surround the chain. This
attachment method can be used when no suitable
attachment points are available and it offers the additio-
nal advantage that the chain sling bundles the load (see
Fig. 5.1.1–5.1.5). For the choker hitch, the working load
limit (WLL) – as specified in the working load limit
tables – amounts to 80 % of the tagged WLL.
Double laced attachment method
This method offers greater safety for loose bundles with
additional looping of the load (see Fig. 5.1.3 and 5.1.5).
When using the double choker hitch, the working load
limit (WLL) is likewise limited to 80 % of the tagged
WLL. When two chain legs are used in the single or
double choker hitch:
• Lace consistently clockwise or anti-clockwise if no
torque will act on the load
• Lace clockwise and anticlockwise if the load should
not roll away during the first lift (see Fig. 5.1.4 and
5.1.5)
CAUTION: Do not lace with more than two
chain legs, because otherwise the load will
not be uniformly distributed to the chain legs.
Fig. 5.1.1: Chain sling in the choker hitch
Fig. 5.1.2: Single laced consistently
clockwise or anticlockwise
Fig. 5.1.4: Single laced clockwise
and anticlockwise
Double looped attachment method
The double looped attachment method offers greater
safety for loose bundles because it loops the load ad-
ditionally. The determination of the working load limit of
suspension gears requires particular attention for this
attachment method. For example, the working load limit
of a single-leg suspension gear remains unchanged when
the hook is hooked into the suspension ring after looping.
On the other hand, if the ring is hooked into the crane
hook after the looping when using a single-leg ring chain,
this results in the WLL of a two-leg suspension.
Fig. 5.1.6: Double looped
Fig. 5.1.3: Double laced consistently
clockwise or anticlockwise
Fig. 5.1.5: Double laced clockwise
and anticlockwise
Fig. 5.1.7: Double looped
Chain slings 12/2021 / Subject to change!
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