Prior to lowering the top drive system or rigging down, ensure that sufficient wraps of drilling line remain on the drum.
在下放或拆卸顶驱系统之前，要保证辊筒上留有足够的大绳圈数。
Prior to lowering the top drive system or rigging down, ensure that sufficient wraps of drilling line remain on the drum.
在下放或拆卸顶驱系统之前，要保证辊筒上留有足够的大绳圈数。
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