Civil Engineering Reference
In-Depth Information
Bridge crane manipulation
converter
stationary
mixer
nonfurnace
treatment
rotating stand
converter
desulphur
mobile
mixer
ladle
ladle
converter
Material flow
FIGURE 8.6 Representation of one chosen material flow in the steel plant.
Dangerous manipulations in the new and well-developed technologies are quite reduced or eliminated.
But there are always lot of very dangerous manipulations with the liquid iron and liquid steel in many old
steel plants.
The main source of the technical risk in this part of metallurgical technology is the improper manipu-
lation with the liquid metal. There is a representation of one chosen material flow in the steel plant shown
in Figure 8.6. The whole transport of material is performed by means of bridge crane and transport truck.
In connection with the hazard identification it is necessary to distinguish two criteria above all:
1. Exposition on risk
2. Cause of risk situation
After determination of all necessary values we obtain the final result: risk values for each element,
which takes part in the working process in the chosen segment of metallurgical technology. Values
and results are given in Table 8.3.
If we determine that the acceptable risk level is R
10, we can discuss the results from various points
of view.
This process of technical risk analysis may be very useful if computerized. The flow diagram developed
for this purpose is shown in Figure 8.7.
8.4 Application of Risk Management in Maintenance
Risk management is a complex of activities, which includes requirements to control, to eliminate or to
minimize risk possibility of death, injury, illness, damage of technical device or environmental impact.
Legal requirements are also to demonstrate systematic implementation of safety requirements according
to valid legislative directions.
There are also involved steps, which lead to identification of dangers. However, it is often a problem
during finding of a solution to collect data about the state of a given system or device. Illustrated in
Figure 8.8 is the method of risk theory application and FMEA (failure mode and effect analysis)
TABLE 9.3 Values and Results
S x a e M a b c UQw
O
P
Risk
I. Smelter
10
1.5
1.3
1
19.5
1
0.6
0.4
2
6
1.5
2.5
10
32.5
II. Smelter
10
1.5
1.3
1
19.5
1
0.6
0.4
2
6
1.5
2.5
10
32.5
III. Smelter
10
1.5
1.5
1
22.5
0.7
0.6
0.4
1.7
5
1.5
2.5
9
31.5
Operator — liquid steel
10
1.5
1.2
1
18
0.8
0.6
0.3
1.7
8
1.5
3
13
23.1
Charging crane
10
1.1
0.7
1
7.7
0.7
0.5
0.3
1.5
8
2
3
13
8.213
Casting crane 220 t
7
1.1
0.7
1
5.39
0.7
0.5
0.3
1.5
8
2
3
13
5.749
Casting crane 240 t
7
1.1
0.7
1
5.39
0.7
0.5
0.3
1.5
8
2
3
13
5.749
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