Run float valves in all BHAs. A manual IBOP requires very high torque (7kftlbs) to close with 10kpsi internal pressure. Spaceout the TDS to be at an accessible height when milling so that if required this high torque can be applied to the manual IBOP. Include a kelly cock just above the rotary table when conducting “at-risk” operations ie perforations / milling / displacing to lower fluid weights. High zinc content IBOPs are not compatible with high chloride (salt) mud environments as dezincification can rapidly occur. If a restriction is observed in the casing / liner run slickline drifts and e-line logs to understand the cause of the restriction before swedging or milling