Selection Of Suitable Round Slings; Arrangement On The Load - Pfeifer Polytex Instructions D'utilisation

• With an even (symmetric) load distribution, equal leg
lengths and equal angles of inclination ß, only three
legs of a 4-leg suspension gear may be assumed to
be load-carrying according to DGUV rule 100-500.
• With an asymmetric load distribution and/or unequal
angles, only one leg may be assumed to be load-
carrying in the case of 2-leg suspension gear and
only two legs in the case of 3-leg or 4-leg suspension
gear.
• If round slings are used in pairs, it is recommended to
use a cross bar so that the load is evenly distributed.
• When attaching the round slings, make sure that
– the entire width of a round sling is evenly loaded.
– the round sling can be dismounted without damage
after the lifting process.
• Round slings must not be twisted or knotted and they
cannot be lengthened by combining several lifting
straps.
• Connect or extend round slings only by means of
suitable shackles or round sling hooks.
• When using a round sling in choker hitch, a hitching
angle of 60 ° must not be exceeded.
• When lifting sharp-edged loads (see definition of
a sharp edge), round slings must be protected with
suitable protective sleeves.
• Round slings must not be placed on sharp edges or
slide and/or be pulled across them. The round sling
can be severed, resulting in the load falling (see
definition of a sharp edge). Sliding on a sharp edge
can also destroy edge protection systems or coatings
with good edge stability and thus also the round sling!
• Definition: An edge is considered to be sharp if
the edge radius R is smaller than the thickness D
of the attachment device!
Fig. 9
60°
Fig. 10
Asymmetric load distribution is always to be expected when
• the load is inelastic (e. g. concrete parts, castings,
short beams, etc.)
• the position of the centre of gravity is not known
• the load is unevenly shaped
• different angles of inclination ß occur

8.2 Selection of suitable round slings

• The safe working load (SWL) of the round sling must
be greater than or equal to the weight of the load –
taking into account reduction factors.
• The rigging method and angles of inclination of the
lifting process must already be considered when
selecting the round slings.
• The round sling must contact the load lifting attachment
(e. g. crane hook) and the load over its entire width.
Round slings that are too wide can be damaged due to
a too small radius (i. e. too much curvature inside the
hook), as the load on the round strap is not uniform.
• In choker hitch, the working load limit is only 80 %.
• Never re-tension in choker hitch! The resulting frictional
heat can damage the attachment device.
• A lateral restriction (crushing), e. g. on a bollard that
is too small, leads to a reduction in the load capacity
of round slings or damages the sheaths and is there-
fore impermissible!
Angles of inclination ß
exceeding 60° are forbidden!

8.3 Arrangement on the load

• Place the round sling on the load in such a way that it
cannot slip on the load or even slip off the load during
the lifting operation.
• Do not attach the round sling to the load with a twist
or a crossover.
• Use suitable strap and/or edge protection with rough
and/or sharp-edged loads.
• The lifting point at which the round sling is attached
must be able to absorb the force introduced during
lifting.
Polytex
®
round slings 12/2021 / subject to change!
9