User information
This
user information presents a general overview regarding the application
of textile lifting slings and does not substitute the existing
operating instructions for specific products! Lifting operations
with textile slings may be carried out by competent users (trained
in theory and practice) only. When operated correctly, our textile
slings offer the highest degree of safety in line with long
life expectancy and avoid damage to products and people.
Limitations of use
Loading
Textile lifting slings
must not be overloaded. The capacities for the most important
lifting/slinging methods are indicated on the identity label.
Always observe the maximum angle from the vertical (angle ß)!
Temperature
Textile lifting
slings made from polyester are admitted for applications at
temperatures between -40? and +100?C. This temperature area
may change in chemical environments. The woven structure of
the drenched textiles at temperatures below 0?C are susceptible
to damage due to the formation of ice. Ice will reduce the flexibility
of the lifting sling! At temperatures below 0?C, dry lifting
equipment should be used only! In dry condition, polyester features
a high electrical resistance and provides an insulating effect
between load and crane hook (e.g. during welding jobs – observe
temperatures!).
Shock loading
Textile lifting
and lashing equipment should not be subjected to sharp jerks
and jolts in order to avoid heavy forces which may be considerably
higher than the actual load weight!
Chemicals
Particular
caution is required when using textile lifting equipment in
areas where chemicals are present.
Polyester has good resistance against mineral acids but will
be destroyed by alkaline – consult our experts for advice in
your specific application! Acid may cause material brittleness
to steel fittings of textile lifting slings! Harmless acid solutions
may concentrate by evaporation to an extent that they provoke
damages. Affected textile lifting equipment must be thoroughly
rinsed in cold water, dried in open air and inspected by a competent
person.
Transport of people
Transport
of people with textile lifting equipment is generally forbidden!
Operation in danger zones
Lifting or transport of loads must be avoided while personnel
are in the danger zone.
People are not allowed to pass over or under a suspended load!
Application advices
- The operator may start moving the load only after it has been
correctly attached and all personnel are clear of the danger
zone.
- Loads must not be left unattended in raised or tensioned condition
for a longer period of time.
Flat webbing or round slings must not be used in knotted, tied
or twisted condition and may only be used for the attachment
of loads.
- Prior to every use, textile lifting and lashing equipment
must be examined with regard to obvious defects. Ensure that
their identity and dimensions are correct and that they are
provided with a legible capacity label. Never use lifting equipment
which is defective or not labelled!
- Damage of the capacity label can be avoided by keeping it
away from the load, the hook or choke hitch operations.
- The angle of the eye must not exceed 20° in order to avoid
inadmissible strain on the seams!
- This will be ensured when the eye length is approx. 4 times
the width of the hook.
- Hooks or other lifting devices
in loaded condition must not be attached in the area of sewn
overlaps or at the seam of the round sling sleeve. Make sure
that the seams are positioned in the straight part of the lifting
device.
- Hooks should be provided with sufficient radius.
- The contact area of the web sling must be straight, so that
the entire cross section of the sling is loaded equally.
- If the carrying width of flat webbing sling is below 75 mm,
the radius curve of the lifting device must be at least 3/4
of the width of the webbing sling.
- Take care that round slings do not overlap in the crane hook.
They must have sufficient space in the hook mouth as well as
at the load, so they can assume their natural, flattened profile
and provide even loading over the full width of the round sling.
- Flat webbing slings should be applied in such a way that they
can carry the load over the full sling width. Greater angles
from the vertical will strain the edges of the slings and possibly
lead to breakage!
- Textile lashing equipment must be protected against sharp
edges, friction and abrasion at both load and lifting device.
A radius edge is classed as sharp, if it is less than the thickness
of the flat webbing or round sling (in flat, loaded condition).
- Never push or place the load onto the lifting device!
- Never pull the load over rough surfaces or edges and do not
drag from underneath a load.
- In “choke hitch” the textile sling should be positioned so
that it can form a natural angle of 60° and that heat due
to friction is avoided.
- Never re-adjust the choke hitch and prevent heat development
by friction (slipping of load).
- In order to lift loads with plain or slippery surface we recommend
double choke hitch.
Round slings and flat webbing slings will stretch under load
by approx. 3 - 5 %. This has to be strictly considered as it
may cause abrasion resp. damages at sensible surfaces. As prevention
we recommend the use of protective sleeves and edge
protectors. In case of (intended) load movements during lifting
operations and resulting friction, e.g. during assembling or
turning of goods, the surface or edges of the load must be secured
by protective sleeves or corner protectors, which will
safeguard the lashing device and leave sufficient space for
movement and alignment without greater friction (see dim. B
in the following drawing).
- If more than one sling is used
to lift a load, these should be of same type with preferably
same length in order to avoid different elongation behaviour
and allow carrying ability over the full width (employ smallest
angle from the vertical or use
spreader beam instead).
- Textile lifting equipment must be stored in a clean, dry and
well ventilated area. Avoid exposure to direct sunlight and
other sources of UV. Keep them away from other heat sources,
chemicals, fumes and corroded surfaces as they will have a negative
effect on the life expectancy of the sling. Slings should not
be dried near open fires or other hot places.
- Textile slings with obvious damages, overloading or other
detrimental influences must be taken out of use and may be returned
to service after inspection and possible repair only.
Maintenance
and repair
Inspections and tests must be performed by competent persons
or specialist workshops only.
Inspections
Depending on application, textile lifting equipment must be
subjected to regular inspections by competent persons, at least
once per year. The inspection must be visual and extended to
the following deficiencies:
Complete and legible identity label.
Damages by chemical influence, e.g. local soaking, chipping
of yarns or heat (hardening).
Steel links must not show deformations, grooves or reduction
to the cross section of more than 10%.
Check for cracks; possible welding points must be visible and
not covered by the webbing.
Inspections have to be recorded.
Defective slings have to be taken out of service immediately
and must be stored separately.
Criteria for disposal of textile lifting
equipment
- Textile slings must not be used any longer if e.g. the marking
(identity label) is missing or illegible. detrimental impacts
have occurred, e.g. overloading, shock loading, chemical influence
or heat.
Flat webbing slings
- damages of selvage, defects of the woven structure by abrasion,
cuts or yarn breakages have occured.
- If 10 % or more of the webbing sling cross section is damaged
the sling must be discarded.
- heavy deformation or melting of yarns
due to heat (shiny surface and/or hardened webbing) can be recognized.
- load bearing seams are defective.
Round Slings
- the outside (sleeve) is damaged by cuts or abrasion.
- the inside (polyester yarns) of the sling is visible.
- the seams of the sleeve are damaged.
Flat webbing slings Rated capacities for
different slinging methods
Round slings Rated capacities for different
slinging methods
