Endress+Hauser Fieldbus levelflex M FMP 40 Operating Instructions Manual page 18

3 Mounting
60
silica sand
smooth metallic walls
silo diameter 12 m
50 silo diameter 9 m
silo diameter 6 m
silo diameter 3 m
40
30
20
10
0
0 5 10
wheat
35
smooth metallic walls
silo diameter 12 m
silo diameter 9 m
30
silo diameter 6 m
silo diameter 3 m
25
20
15
10
5
0
0 5 10
18
3.4.4 Installation in bulk solid silos
Tensile load
Bulk solids exert tensile forces on rope probes whose height increases with::
• the length of the probe, i.e. max. cover,
• the bulk density of the product,
• the silo diameter and
• the diameter of the probe rope
The following diagrams show typical loads for frequently occurring bulk solids as
reference values. The calculation is performed for the following conditions:
• Suspended probe (probe end not fixed at the bottom)
• Free-flowing bulk solid, i.e. mass flow. A calculation for core flow is not possible.
In the event of collapsing cornices, considerably higher loads can occur.
• The specification for tensile forces contains the safety factor 2, which compensates
for the normal fluctuation range in pourable bulk solids.
40
35
30
25
20
15
10
5
0
15 20 25 30 35
level [m]
24
22
20
18
16
14
12
10
8
6
4
2
0
15 20 25 30 35
level [m]
Levelflex M FMP 40 with Foundation Fieldbus
18
polyethylene pellets
smooth metallic walls
16
silo diameter 12 m
silo diameter 9 m
silo diameter 6 m
14
silo diameter 3 m
12
10
8
6
4
2
0
0 5 10 15 20
level [m]
60
cement
smooth metallic walls
silo diameter 12 m
silo diameter 9 m
50
silo diameter 6 m
silo diameter 3 m
40
30
20
10
0
0 5 10 15 20
level [m]
12
11
10
9
8
7
6
5
4
3
2
1
0
25 30 35
40
35
30
25
20
15
10
5
0
25 30 35
Endress+Hauser