I would think that the wall thickness of the strings will be thicker than 0.375.
I did some calculations at 0.5 inch wall thickness and also at 0.75 inch wall thickness and the tonnage is monstrous.
That is why this is the only drill rig that can handle the weight.
0.75 wall thickness gets you up near 250 Tonnes.
Ann: Lockyer Deep-1 Operational Update, page-155
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