48
7.10.2 Testing of wear and replacement of the load chain
The continuous monitoring of the load chain is compulsory according to DIN 685-5:1981 and the accident
prevention regulations in DGUV V54 (BGV D8), §27. The load chain must be tested before starting
operation and after approx. 200 operating hours or 10,000 load cycles under normal conditions or more
often under harsh and severe conditions.
Testing must cover checking links, particularly at their points of contact, for wear, cracks, deformation and
other damages.
The chain must be replaced:
•
if the nominal thickness at the points of contact is reduced by 10%,
•
if the chain or a link is elongated by 5 %, or an eleven links piece of chain is elongated by 2%
•
if the links are rigid
t
= nominal length of one chain link
d
= nominal diameter of chain link
d
1
, d
2
= actual diameters
d
m
=
Figure 47: Load chain dimensions
Chain dimensions
mm×mm
4×12
5×15
5.2×15
7×22
7.2×21
Nominal diameter of link
d in mm
4
5
5.2
7
7.2
Wear limit of diameter
d
m
in mm
3.6
4.5
4.7
6.3
6.5
Length over 1 link
t in mm
12
15
15
22
21
Wear limit of length of one link (max)
t
max
in mm
12.6
15.8
15.8
23.1
22.1
Length over 11 links
11×t in mm
132
165
165
242
231
Wear limit of length of 11 links (max)
(11×t)
max
in mm
134.6
168.3
168.3
246.8
235.6
Table 13: Measurement of wear
Caution!
Replacement of chain shall only be done if spare parts are obtained from the manufacturer
or his approved service agent.
The chain guide and hold-down must also be replaced with the chain if necessary.
To replace the load chain, see chapter 3.1.6 and following.
7.11
Measuring wear and replacing load hook
According to DIN 15401-1:1979 load hooks have to be replaced if the length between the chisel punch marks
(dimension Y) widened more than 10 % or the load bearing section is reduced by 5 %. The permissible values are
shown on the hook certificate in the Inspection book.
t
11 x t
d
d
d
1
2
d
1
+ d
2
2
Summary of Contents for STAGEKET
Page 55: ...55 13 Example of Declaration of Conformity...
Page 56: ...56 14 Example of Declaration of Incorporation...
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