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The customer was experience safety issue when clamping the BOP MUX control cables to the riser due to having to rig up small ineffective free-hanging roller sheaves too far from well center.  Hampco developed and supplied 90° roller sheaves rotating about fixed vertical axis on the end of mechanical telescoping arms.  The sheaves were manufactured from stainless steel and the arms were fully galvanized to minimize maintenance.  The mechanical arms were extended and retracted by small manual chain block to eliminate hydraulics and again minimize maintenance.

MUX Cable Turndown Sheaves