pewag Winner pro G12 Originalbetriebsanleitung Seite 33

If the lifting chains will not be used for long periods of time, then they should be cleaned, dried and protected
against corrosion (e.g. lightly oiled) before being stored. When the chain sling has been stored for a long period and
the regular inspections have not been made, or it has been stored incorrectly (see also inspections), an inspection
must be carried out before the first use.
Guidelines for the implementation of lifting procedures
The following guidelines should support the user in the preparation and execution of lifting procedures. They are by
no means exhaustive and should not replace proper training; hence the ISO 12480-1 will also be referenced.
Before commencing lifting, one should check that the load can move freely and is not anchored or attached to
something else.
It is important that the weight of the load to be lifted is known. If it is not specified, possible information can be taken
from the shipping documents, handbooks, plans etc. If no information can be found, then the mass should be
estimated by calculation.
The lifting points of the lifting chain must be proportioned to the load's centre of gravity so that it does not tilt or
topple over:
• The lifting point needs to be vertical over the centre of gravity when using a single-strand lifting chain and basket
chain
• The lifting points using a double-strand lifting chain need to be symmetrical on both sides above the centre of
gravity
• The lifting points on a three or four-strand lifting chain must be at the same level above and evenly distributed
around the centre of gravity – see the explanation on "Angle of inclination" under the "Intended Use" heading
All multi-leg lifting chains produce a tensioning force (horizontal power component see figure 19) on the load that
increases when the angle of inclination β of the chain increases. Always ensure that the load to be moved can
withstand the horizontal power components without becoming damaged in the process. The grey-shaded area
depicts an angle of inclination of greater than 60° wherein which a lifting chain should never be used. If chains are
put through a barrel hook (e.g. drum chain slings), then the horizontal power component is much greater than the
angle of inclination of the chain suggests. Hence the angle of inclination in this case should be no more than 30°
(see figure 20).
Tension
Load = 10 t
Figure 19
Only after considering all the above information, can the appropriate lifting type and necessary strand number be
chosen correctly.
Possible limitations (e.g. temperature influence, asymmetry etc) need to be identified in order to determine the
appropriate load capacity of the lifting chain.
Figure 20
E
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