3.5 Separate
Maintenance-related examples include: (i) Separating flammable fuels and hot-work activities in space by locating the fuel storage reasonable distances away from the worksites and (ii) separating hazardous activities and unexpected environmental hazards in time by suspending work to continue at a safer time.
3.6 Fail-safe design
Maintenance-related examples include:
(1) Fail-safe equipment A potential application is such that ensures that the failure of a remotely operated vehicle (ROV) or an autonomous underwater vehicle (AUV) during a leak repair does not lead to a collision with the affected containment system to avoid a rupture.
(2) Fail-safe procedures Potential applications include: Using a default “danger” signal as part of the operating procedure of a ROV or an AUV such that in case of a fault in the signalling system, an incapacitated operator, or the unexpected encroachment of another watercraft, the encroaching vessel will never be shown an erroneous "clear" signal. Another possible procedure based application is the design and use of electronic permit to work (ePTW) system with step-by- step processes and fail-safe prompts and checks to ensure compliance.
3.7 Fault/error tolerance
Maintenance-related examples include: Designing maintenance procedures that will make installation error associated with use of wrong part, reversed installation, incorrect attachment, omission or incorrect connection impossible, ensuring that no single failure in a remotely operated vehicle (ROV) or an autonomous underwater vehicle (AUV) or in a maintenance procedure should lead to a serious accident.