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HVDC TRANSFORMER BUSHINGS
PHI 530.1425.2500
PHI 265.850.1500
Kepco project
IS 2664 GB
Page
13
of
70
Bolts and nuts of the lifting tools must be tightened at torque values listed in the following
Table 7.
Screw / nut
type
Tightening
Torque
[Nm]
M12
60
M24
229
M30
460
Table 7 – Screws and nut tightening torques
To lift and install the bushings on the transformer the lifting crane shall have the following minimum
characteristics:
Solution with one overhead crane
•
Single grinder crane.
•
Crane capacity
≥
2.5 t.
•
Hoist lifting height
≥
12m.
•
Slow hoisting speed
≤
1.3 m/min.
Or, as an alternative:
N. 1 mobile telescopic crane with the following technical characteristics:
•
Single crane.
•
Lifting boom working length
≥
17m.
•
Hoist lifting height
≥
12m.
•
The capacity of the crane must comply with the characteristics indicated in with the following
Figure 6
.
The crane operative working conditions must be within the limits set by the red area.
Figure 6 – Mobile crane working characteristics