User Instruction
1. Reference should be made to German Standards accord. BGR
500/DGUV 100-500 or other country specific statutory regulations
and inspections are to be carried out by competent persons only.
2. When storing hoist rings make sure that they are protected
against atmospheric influence and aggressive substances.
Before installation and every use, inspect visually RUD lifting points,
paying particular attention to any evidence of funktion, corrosion,
wear, weld cracks and deformations. Please ensure compatibility
of bolt thread and tapped hole.
3. The material construction to which the lifting point will be at-
tached should be of adequate strength to withstand forces during
lifting without deformation. The German testing authoritiy BG,
recommends the following minimum for the bolt lengths:
1
x M in steel (min. quality S235JR [1.0037])
1,25 x M in cast iron (e.g. GG25)
2
x M in aluminium
2,5 x M in aluminium-magnesium alloys
(M = thread Ø, e.g. M20)
When using hoist rings in combination with light metals nonferrous
heavy metals and grey cast iron, please inquire a special solution
and inform us about the material in detail.
Hint
Acc. to GS-Mo 15-04 only the
provided bolts
must
be used.
4. Determine the position of the hoist rings in such a way that forbid-
den loading like bending of the ring during load turning will be avoided.
a) For single leg lifts, the lifting point should be vertically above the
centre of gravity of the load.
b) For two leg lifts, the lifting points must be equidistant to/or above
the centre of gravity of the load.
c) For three and four leg lifts, the lifting points should be arranged
symmetrical around the centre of gravity, in the same plane if
possible.
5. Load symmetry:
The required WLL of the individual RUD lifting point are calculated
using the following formula and are based on symmetrical loading:
The calculation of load bearing legs is as follows:
symmetrical asymmetrical
two leg
2
1
three/four leg
3
1
(see table 2)
6. For the bolt-on-surface in the area of the screwing zone the
following Standard is valid: Flatness tolerance acc. to DIN ISO
2768-H. The surface roughness should be between Rz 100 and
Rz 400. Thread hole position tol/- 0,3 mm. All other tole-
rances acc. to DIN ISO 2768-m. Metric internal screw thread must
be machined acc. to DIN 13-6H.
7. At bolt-on positions without form-fit shift protection the contact
areas must be free of lubricants, coatings, forging scales. The
WBPG must be able to pivot in the bolted condition by 180° and
should swivel 360°. The provided bolts must be torqued with a
moment of torsion (+/- 10 %) acc. to chart 1. When using multiple
head bolts (hexagon bolts with additional hexagon sockets) the
outside hexagon must be used for tightening.
8. Shock loads or vibrations, especially at through holes
can cause unintended untightening of the bolt connection.
Possibilities for securing: Liquid glue for example Locti-
te (please read user instruction of manufacturer carefully).
For through hole connections please use RUD self securing nuts.
Secure in general all boltable connections of the lifting points with
srew locking glue.
9. All fittings connected to the WBPG should be free moving. When
using round slings, wire ropes or chains directly with the hoist ring
an adapter shackle might be necessary to guarantee the prescribed
minimum radius of the lifting mean manufacturer. To avoid injuries
during work with lifting means, please keep hands and other body
parts out of the shackle´s pivot and swiveal area reach. Damage
of the lifting means caused by sharp edges should be avoided as
well.
10. Effects of temperature:
WBPG hoist rings can be used in temperature areas from
-10°C up to 100°C
11. RUD-Lifting points must not be used under chemical influences
such as acids, alkaline solutions and vapours e.g. in pickling baths
or hot dip galvanizing plants. If this cannot avoided, please contact
the manufacturer indicating the concentration, period of penetration
and temperature of use.
12. The places where the lifting points are fixed should be marked
with colour.
13. If the lifting points are used exclusively for lashing, the value
of the working load limit can be doubled. LC = 2 x WLL
14. After fitting, an annual inspection or sooner if conditions dic-
tate should be under taken by a competent person examining the
continued suitability. Also after damage and special occurrences.
Inspection criteria concerning paragraphs 2 and 14:
- Ensure correct bolt and nut size, bolting quality and bolting
length
- Ensure compatibility of bolt thread and tapped hole
- The lifting point should be complete
- The bolt-on surface of the hoist ring must be flat and the full
area must be supported
- The working load limit and manufacturers stamp should be
clearly visible
- Deformation of the component parts such as body, load ring,
bolt or threaded bolt
- Mechanical damage, such as notches, particularly in high
stress areas
- Wear should be no more than 10 % of cross sectional diame-
ter
- Evidence of corrosion
- Evidence of cracks
- Damage to the bolt, nut and/or thread
- Pivoting- and swivelling must be guaranteed.
W
LL
= working load limit
G
= load weight (kg)
n
= number of the load bearing legs
ß
= angle of inclination of the chain strand to the verical
W
LL
=
G
n x cos ß
A non-adherence to this advice may result
damages of persons and materials!
Warning:
WBPG Hoist rings are only suiteable for loads in the
pivot level of the ring. Because of the ball bearing the
swivelling bolt will turn towards the load force most
probably. Please remove all influence which prevent
the aligning of the ring before loading.
