POWERTEX Round sling, Инструкция по эксплуатации

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Working load limits for some modes may be given on the label. In the
case of multi-leg slings the maximum angle to the vertical should not
be exceeded.
3.4 Good slinging practices should be followed: the slinging, lifting and
lowering operations should be planned before commencing the lift.
3.5 Slings be should correctly positioned and attached to the load in a
safe manner. Slings should be placed on the load such that they are
able to adopt the flattened form and the loading is uniform across
their width. They should never be knotted or twisted.
Damage to labels should be prevented by keeping them away from the
load, the hook and the angle of choke.
3.6 In the case of multi-leg slings, the WLL values have been determi-
ned on the basis that the loading of the sling assembly is symmetrical.
This means that when a load is lifted the sling legs are symmetrically
disposed in plan and subtended at the same angle to the vertical.
In the case of 3 leg slings, if the legs are not symmetrically disposed in
plan the greatest tension is in the leg where the sum of the plan angles
to the adjacent legs is greatest. The same effect occurs in 4 leg slings
except that the rigidity of the load should also be taken into account.
NOTE With a rigid load the majority of the weight may be
taken by only three, or even two, of the legs, with the
remaining legs only serving to balance the load.
3.7 Slings should be protected from edges, friction and abrasion,
whether from the load or the lifting appliance. Where protection against
damage from edges and/or abrasion is supplied as part of the sling,
this should be correctly positioned. It may be necessary to supplement
this with additional protection.
Definition of a sharp edge:
Radius r (edge) < thickness d of the
lifting gear.
3.8 The load should be secured by the sling(s) in such a manner that it
cannot topple or fall out of the sling(s) during the lift. Sling(s) should be
arranged so that the point of lift is directly above the centre of gravity
and the load is balanced and stable. Movement of the sling over the
lifting point is possible if the centre of gravity of the load is not below
the lifting point.
When using basket hitch, the load should be secure since there is no
gripping action as with choke hitch and the sling can roll through the
lifting point. For slings which are used in pairs, the use of a spreader is
recommended so that the sling legs hang as vertically as possible and
to ensure that the load is equally divided between the legs.
When a sling is used in choke hitch, it should be positioned so as to
allow the natural (120°) angle to form and avoid heat being generated
by friction. A sling should never be forced into position nor an attempt
made to tighten the bite. The correct method of securing a load in a
double choke hitch is illustrated in figure 3.A (roundsling) and 3.B (web
-
bing slings) double choke hitch provides greater security and helps to
prevent the load sliding through the sling.
Figure 3.A Figure 3.B
3.9 Care should be taken to ensure the safety of personnel during the
lift. Persons in the danger area should be warned that the operation is
to take place and, if necessary, evacuated from the immediate area.
Hands and other parts of the body should be kept away from the sling
to prevent injury as the slack is taken up.
The work with lifting devices and equipment’s must be planned, organi-
zed and executed in order to prevent hazardous situations.
In accordance with national statutory regulations lifting devices and
equipment’s must only be used by someone well familiar with the work
and having theoretical and practical knowledge of safe use.
Apart from the instruction manual we refer to existing national regulati-
ons on each work place.
3.10 A trial lift should be made. The slack should be taken up until the
sling is taut. The load should be raised slightly and a check made that
it is secure and assumes the position intended. This is especially
important with basket or other loose hitches where friction retains the
load.
If the load tends to tilt, it should be lowered and attachments re-posi-
tioned. The trial lift should be repeated until the stability of the load is
ensured.
3.11 Care should be taken when making the lift to ensure that the load
is controlled, e.g. to prevent accidental rotation or collision with other
objects.
Snatch or shock loading should be avoided as this will increase the
forces acting on the sling.
A load in the sling or the sling itself should not be dragged over the
ground or rough surfaces.
3.12 The load should be lowered in an equally controlled manner as
when lifted.
Trapping the sling when lowering the load should be avoided. The load
should not rest on the sling, if this could cause damage and pulling the
sling from beneath the load when the load is resting on it should not be
attempted.
3.13 On completion of the lifting operation the sling should be returned
to proper storage.
When not in use, slings should be stored in clean, dry and well ven-
tilated conditions, at ambient temperature and on a rack, away from
any heat sources, contact with chemicals, fumes, corrodible surfaces,
direct sunlight or other sources of ultra-violet radiation.
3.14 Prior to placing in storage, slings should be inspected for any
damage which may have occurred during use. Slings should never be
returned damaged to storage.
3.15 Where lifting slings have come into contact with acids and/or alka-
lis, dilution with water or neutralization with suitable media is recom-
mended prior to storage.
Depending on the material of the lifting sling and on the chemicals re-
ferred to in 1, 1.1, it may be necessary in some cases to request from
the supplier additional recommendations on the cleaning procedure to
be followed after the sling has been used in the presence of chemicals.
3.16 Slings which have become wet in use, or as the result of cleaning,
should be hung up and allowed to dry naturally, not near a heat source.
4 Examination and repair
Examination periods should be determined by a competent person,
taking into account the application, environment, frequency of use and
similar matters, but in any event, slings should be visually examined at
least annually by a competent person to establish their fitness for
continued use.
Records of such examinations should be maintained.
Damaged slings should be withdrawn from service. Never attempt to
carry out repairs to the slings yourself.
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