BG 25 / 2011 / 2254_BG25_en_0000498763_V01
5.9.2 To Use the Main Winch in Combination with Crowd
Danger of damaging the slewing ring and undercarriage by overloading!
Pulling by the main winch combined with pulling by the crowd system is
permissible only under observance of the following instructions.
Pulling by the main winch together with the crowd system is allowed only
in the case of a recovery, and
where the rig is equipped with a mast prop which is fully extended, and
where the attached tool string has the appropriate provisions (e.g. a defined stop
for the Kelly on the casing drive adapter, in Kelly applications)
Equipment fitted with a mast prop may have a monitoring automatic
which stops the main winch from pulling during crowd as soon as a cer-
tain value of the combined forces is exceeded.
Where there is no such monitoring automatic, the operator himself is
responsible for not endangering the capacities of the rig when forces
sum up.
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